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  • 1.
    Agrawal, Tarun Kumar
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Sharma, Ajay
    Kumar, Vijay
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Blockchain-Based Secured Traceability System for Textile and Clothing Supply Chain2018Ingår i: Artificial Intelligence for Fashion Industry in the Big Data Era / [ed] Sébastien Thomassey, Xianyi Zeng, Singapore: Springer Publishing Company, 2018, s. 197-208Kapitel i bok, del av antologi (Refereegranskat)
    Abstract [en]

    Blockchain has emerged as a prominent and reliable solution that can enable and ensure secure information sharing over wide area networks. In an era of digitalisation, blockchain technology is finding wide applications in multiple fields including implementing traceability in the supply chain. In this direction, this chapter explores its potential application in implementing a blockchain-based traceability system for textile and clothing (T&C) supply chain. It examines the necessity and concept of a traceability system, followed by enlisting advantages of blockchain technology for implementing traceability. Further, a case-based example has been used to explain blockchain application in implementing traceability in T&C supply chain. Finally, it mentions the challenges and limitations of such blockchain-based traceability system that can be addressed through further research.

  • 2.
    Kumar, Vijay
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    A game-theoretic approach for textile manufacturer-buyer relation under quality inspection and traceability regime2016Ingår i: Uncertainty Modelling in Knowledge Engineering and Decision Making: Proceedings of the 12th International FLINS Conference (FLINS 2016), 2016, Vol. 10, s. 785-793Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper studies the textile manufacturer–buyer relationship under quality inspection and traceability policy using non-cooperative Stackelberg game models. These models consider constant demand and price function, whereas the manufacturer and buyer regulate their profits by controlling product quality, transfer payment, quality inspection and traceability.

  • 3.
    Kumar, Vijay
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Exploring fully integrated textile tags and information systems for implementing traceability in textile supply chains2017Doktorsavhandling, monografi (Övrigt vetenskapligt)
    Abstract [en]

    Exploring fully integrated textile tags and information systems for implementing traceability in textile supply chains

    Traceability, in general, refers to keeping track of information to a certain degree. The concept of traceability is considered important to verify the various aspects of products in different industries and their global supply chains. Textile industry is among those which are accused time‐to‐time for opaque supply chains and unsustainable practices. Particularly, the aftermath of a series of industrial catastrophes, customers and non‐government organizations have started to scrutinize the brands to bring transparency in their supply chains. In this direction, traceability has been identified as a tool for organizations to trace their supplies throughout the supply chains and collect relevant information to ensure transparency and claim validation. Traceability has been further acknowledged as a competitive element and often acts as a decisive factor in purchase process. Moreover, the textile products are one of the most counterfeit‐prone items around the world. As a result, the demand for traceability has been intensified for supply chain monitoring and security, and product authentication.

    The principal aim of this thesis was to address the implementation of traceability information systems in the textile supply chain. Further, it investigates the feasibility of yarn‐based integrated tracking tags as a means to impart traceability in textiles. It has been pursued through several independent studies in the domain of textile manufacturing, supply chain management and information systems. The appended papers in this thesis address various aspects of traceability implementation in the textile supply chain and how traceability information can be encoded into the textiles using yarn‐based coding.

    Traceability consists of two components namely information system and tagging. The latter component is used to uniquely identify the product in the supply chain which assists in recalling and/or storing the relevant traceability data from/in the information system. Different actors in the supply chain manage the traceability data in their information systems, therefore traceability tag acts as a linking agent for information exchange. In this direction, this thesis introduces the concept of yarn coding and yarn coding‐based integrated tags which can be potentially used in future for textile traceability applications. In addition, a framework is proposed for the implementation of traceability information system in the textile supply chain. The work highlights various elements which can play a significant role in promoting and/or implementing traceability. Regardless of perspective or viewpoint, traceability is interwoven between technical and managerial aspects; therefore traceability implementation requires a techno‐managementapproach to obtain an optimal solution.

  • 4.
    Kumar, Vijay
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi. College of Textile and Clothing Engineering, Soochow University, 215021 Suzhou, China; ENSAIT/GEMTEX, Roubaix, France; Universite Lille1-Sciences and Technologies, Lille, France.
    Agrawal, Tarun Kumar
    College of Textile and Clothing Engineering, Soochow University, 215021 Suzhou, China; ENSAIT/GEMTEX, Roubaix, France; Universite Lille1-Sciences and Technologies, Lille, France.
    Wang, Lichuan
    College of Textile and Clothing Engineering, Soochow University, 215021 Suzhou, China.
    Chen, Yan
    College of Textile and Clothing Engineering, Soochow University, 215021 Suzhou, China.
    Contribution of traceability towards attaining sustainability in the textile sector2017Ingår i: Textiles and Clothing Sustainability, ISSN 2197-9936, Vol. 3, nr 5Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Sustainability is a widely recognized concern and priority for healthy growth of the society and for preservation of the planet. Concerning this, textile sector has seen an unprecedented demand for sustainable products from the consumers, responding to which organizations have undertaken different initiatives. One of the major concerns in the textile sector is its complex supply chain networks and the involvement of numerous actors dealing with diverse raw materials and operations. The effective implementation of sustainability at the industrial scale would require the participation of all supply chain actors, along with an efficient traceability system to monitor and analyze different sustainability aspects. Furthermore, traceability is an integral part of the recycling process which contributes towards the sustainability. Therefore, the present article focuses on the contribution of traceable information towards attaining the sustainability in the textile sector. The three pillars of sustainability, namely, ecological, societal, and economic, are discussed for their relation and dependency on the traceability followed by an overview of the challenges in successful implementation of the traceability system, which is anticipated to shape the future research questions.

  • 5.
    Kumar, Vijay
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Ekwall, Daniel
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Macro-Scale Indicators Based Analysis of Textile Product Recalls in the EU2016Ingår i: NOFOMA 2016 - PROCEEDINGS OF THE 28TH ANNUAL NORDIC LOGISTICS RESEARCH NETWORK CONFERENCE, TURKU, FINLAND, 8-10 JUNE 2016,, 2016, s. 321-340Konferensbidrag (Refereegranskat)
    Abstract [en]

    ABSTRACT

    Purpose

    The purpose of this article is to study the relationship between macro-scale indicators (social, economic and governance) with textile product recalls in the EU. Here the main focus is given to a systemic approach to understand the problem from a holistic perspective, focusing on the interactions among components rather than focusing only on causes.

    Design/methodology/approach

    The EU’s recalled textile product data and macroscale indicators used in the study were obtained from multiple sources, namely RAPEX, Transparency International, Eurostat, and The World Bank. The data have been used for the years 2008-2013. Multiple linear regression analysis and p-value statistics were used to scale the impact and statistical significance respectively, of the indicators on the textile product recalls.

    Findings

    Findings from the study suggest that the textile recall is influenced by governance and social aspects of the EU member states while the economic aspect has negligible statistical significance. Results further suggest that better governance and higher social inequality lead to lesser textile product recalls.

    Original/value

    This study is first to quantitatively identify of the role of social, governance and economic aspects of the EU member states on their textile-product recalls. The previous qualitative research works have been focused on a particular brand or recall which limit the generalization of their conclusions. Whereas, this paper uses a systemic approach to understand the problem from a holistic perspective, focusing on the interactions among components rather than focusing only on causes.

  • 6.
    Kumar, Vijay
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Ekwall, Daniel
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Hallqvist, Carina
    Högskolan i Borås, Akademin för bibliotek, information, pedagogik och IT.
    DEVELOPMENT OF TRACEABILITY FRAMEWORK FOR TEXTILE SUPPLY CHAIN2016Ingår i: NOFOMA 2016 - PROCEEDINGS OF THE 28TH ANNUAL NORDIC LOGISTICS RESEARCH NETWORK CONFERENCE 8-10 JUNE 2016, TURKU, FINLAND, 2016Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    ABSTRACT

    Purpose

    The focus of this work-in-progress is to develop a general traceability framework for the textile supply chain. Traceability is of a significant importance for the textile industry, firstly due to multiple actors’ involvement in the production and distribution, and secondly the heterogeneous nature of actors, dealing with diverse materials, including fibre spinning mills, yarn spinning mills, weaving industry and garment manufacturers. Moreover, The textile industry has seen a global shift towards recently industrialized countries; consequently, the offshore buyers have become more dependent on complex supply chains and created more information asymmetry as offshore buyers cannot directly observe the production activities of a distant manufacturer. Resulting consequences of information asymmetry can be seen in terms of counterfeit products, malpractices in production and other social and environmental issues. Moreover, textile market is a volatile market because of rapidly changing trends and consumers’ preferences, therefore inter-actor visibility of production activities is required for synchronous production to meet the market demands. Considering the above-mentioned characteristics and challenges in textile industry, this work targets to develop a traceability framework for improving supply chain visibility and integrate various actors in the textile production supply chain.

    Design/methodology/approach

    The traceability framework development has been divided into four steps, namely, identification of user requirement of different stakeholders in the textile supply chain, identification of different information points, traceability data modelling, and information exchange model to develop traceability among various stakeholders in the textile production supply chain. In-depth analysis was conducted for the need of traceability from various stakeholders’ perspectives in textile sectors, which include various actors in textile production and distribution, consumers and surveillance/certification authorities. An UML case diagram approach has been followed to define the traceability requirements and UML class diagram approach has been adopted for modelling traceability data.

    Findings

    The present traceability framework is proposed to handle traceability information and information exchange between various stakeholders in the textile production supply chain, which can not only disseminate the traceability information in the supply chain, but also helpful 704 in case of recall crisis (such as product design fault, harmful chemicals or other related issues) where surveillance authorities can track (forward traceability) and trace (for identifying the source error which resulted recall) the products in the textile supply chain for recalling. Moreover, the traceability information can be used by consumers in order to about the product and raw materials’ history.

    Practical implications

    Traceability works on the credibility of the organizations, which handle the traceability data. Therefore, in the real implementation, either organizations need to be transparent in terms of traceability data or third party certification/audit is required for ensuring that the traceability information provided by an organization is correct/authentic. Secondly the semantics for information exchange are required to be unified across various actors involved in traceability information storage and exchange.

    Original/value

    The traceability framework covers perspectives from traceability not only from various actors involved in textile supply chain, but also includes consumers therefore, traceability information is collected by this framework can be utilized from industrial as well as consumer and surveillance perspectives.

  • 7.
    Kumar, Vijay
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi. Soochow University; GEMTEX; Université Lille.
    Ekwall, Daniel
    Högskolan i Borås, Akademin för textil, teknik och ekonomi. Hanken School of Economics.
    Wang, Lichuan
    Soochow University.
    Supply Chain Strategies for Quality Inspection under a Customer Return Policy: A Game Theoretical Approach2016Ingår i: Entropy, ISSN 1099-4300, E-ISSN 1099-4300, Vol. 18, nr 12Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper outlines the quality inspection strategies in a supplier–buyer supply chain under a customer return policy. This paper primarily focuses on product quality and quality inspection techniques to maximize the actors’ and supply chain’s profits using game theory approach. The supplier–buyer setup is described in terms of textile manufacturer–retailer supply chain where quality inspection is an important aspect and the product return from the customer is generally accepted. Textile manufacturer produces the product, whereas, retailer acts as a reseller who buys the products from the textile manufacturer and sells them to the customers. In this context, the former invests in the product quality whereas the latter invests in the random quality inspection and traceability. The relationships between the textile manufacturer and the retailer are recognized as horizontal and vertical alliances and modeled using non-cooperative and cooperative games. The non-cooperative games are based on the Stackelberg and Nash equilibrium models. Further, bargaining and game change scenarios have been discussed to maximize the profit under different games. To understand the appropriateness of a strategic alliance, a computational study demonstrates textile manufacturer–retailer relation under different game scenarios.

  • 8.
    Kumar, Vijay
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi. Soochow University China.
    Hallqvist, Carina
    Högskolan i Borås, Akademin för bibliotek, information, pedagogik och IT.
    Ekwall, Daniel
    Högskolan i Borås, Akademin för textil, teknik och ekonomi. Hanken School of Economics, Finland.
    Developing a Framework for Traceability Implementation in the Textile Supply Chain2017Ingår i: Systems, ISSN 2079-8954, Vol. 5, nr 2, artikel-id 33Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Traceability has recently gained considerable attention in the textile industry. Traceability stands for information sharing about a product including the product history, specification, or location. With the involvement of globally dispersed actors in the textile supply chain, ensuring appropriate product quality with timely supplies is crucial for surviving in this industry with ever increasing competition. Hence it is of paramount importance for a supply chain actor to track every product and trace its history in the supply chain. In this context, this paper presents a framework to implement traceability in the textile supply chain. A system approach has been followed, where firstly the usage requirement of traceability is defined, and then a framework for implementing intra-actor or internal traceability and inter-actor or external traceability is discussed. This article further presents a sequential diagram to demonstrate the interaction and information exchange between the actors in the supply chain, when the traceability information is requested. An example is also illustrated for data storage using a relational database management system and information exchange using XML for the textile weaver. Finally, the article discusses challenges and future studies required to implement traceability in the textile supply chain.

  • 9.
    Kumar, Vijay
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Haspel, Henrik
    MTA-SZTE “Lendület” Porous Nanocomposites Research Group, Rerrich Bela ter 1., Szeged, Hungary; Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Bela ter 1., Szeged, Hungary.
    Nagy, Krisztina
    MTA-SZTE “Lendület” Porous Nanocomposites Research Group, Rerrich Bela ter 1., Szeged, Hungary; Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Bela ter 1., Szeged, Hungary.
    Rawal, Amit
    Department of Textile Technology, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, India.
    Kukovecz, Akos
    MTA-SZTE “Lendület” Porous Nanocomposites Research Group, Rerrich Bela ter 1., Szeged, Hungary; Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Bela ter 1., Szeged, Hungary.
    Leveraging compressive stresses to attenuate the electrical resistivity of buckypaper2016Ingår i: Carbon, ISSN 0008-6223, E-ISSN 1873-3891, Vol. 110, s. 62-68Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Buckypaper (BP) is a planar film that consists of random network of multiwall carbon nanotubes (MWCNTs) held together by weak van der Waals interactions at tube-tube junctions. Although individual carbon nanotubes (CNTs) possess remarkable electrical properties, the electrical resistance of pristine BP is usually too high for practical applications. However, the electrical resistivity of BP can be attenuated by applying modest compressive stresses. Herein, we report an analytical model for predicting the electrical resistivity of BP under defined level of compressive strain. The predictive piezoresistive model of BP was developed by formulating a direct relationship with the structural parameters, physical and electrical properties of CNTs. The basis of the piezoresistive model relied upon the geometrical probability approach in combination with classical Hertzian contact mechanics and constriction resistance techniques. A comparison has been made between the theoretical and experimental results of electrical resistivity of BPs with varying densities. A reasonably good quantitative agreement was obtained between the theory and experiments. The main source of error was caused by the uncertainty in the measurement of the initial BP thickness. Through theoretical modeling, the initial volume fraction of CNTs was found to be one of the key parameters that modulated the piezoresistive behavior of BP.

  • 10.
    Kumar, Vijay
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi. Soochow University; GEMTEX; Université Lille.
    Koehl, Ludovic
    GEMTEX; Université Lille.
    Zeng, Xianyi Zeng
    GEMTEX; Université Lille.
    Ekwall, Daniel
    Högskolan i Borås, Akademin för textil, teknik och ekonomi. Hanken School of Economics.
    Coded yarn based tag for tracking textile supply chain2017Ingår i: Journal of manufacturing systems, ISSN 0278-6125, E-ISSN 1878-6642, Vol. 42, s. 124-139Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Traceability has gained considerable attention to facilitate monitored production, product recall, safety and reverse supply chain activities, in recent years. Traceability in manufacturing and distribution involves the use of tracking tags which are attached to the products; consequently, the products are tracked by recording the identity of attached tracking tags in the supply chain. In this context, this paper introduces a new yarn coding-based tracking tag which is fully integrated into textile for tracking the textile supply chain. The new tracking tag involves the use of special yarns which act as information carrier and basic unit of the tracking tag. An implementation scenario is discussed to use the designed tracking tag to monitor the production and authentication purposes. Real prototypes of the fully integrated coded yarn based textile tags are demonstrated in woven and knitted structures and analysed under the effect of washing treatments to simulate realistic conditions. Further, an image pattern recognition based algorithm has been introduced and analysed to extract the information encoded in the tag using coded yarns.

  • 11.
    Kumar, Vijay
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Rao, P.V. Kameswara
    Department of Textile Technology, Indian Institute of Technology Delhi, India.
    Rawal, Amit
    Department of Textile Technology, Indian Institute of Technology Delhi, India.
    Amplification of electrolyte uptake in the absorptive glass mat (AGM)separator for valve regulated lead acid (VRLA) batteries2017Ingår i: Journal of Power Sources, ISSN 0378-7753, E-ISSN 1873-2755, Vol. 341, s. 19-26Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Absorptive glass mat (AGM) separators are widely used for valve regulated lead acid (VRLA) batteries due to their remarkable fiber and structural characteristics. Discharge performance and recharge effectiveness of VRLA batteries essentially rely on the distribution and saturation levels of the electrolyte within the AGM separator. Herein, we report an analytical model for predicting the wicking characteristics of AGM battery separators under unconfined and confined states. The model of wicking behavior of AGM is based upon Fries and Dreyer's approach that included the effect of gravity component which was neglected in classic Lucas-Washburn's model. In addition, the predictive model of wicking accounted for realistic structural characteristics of AGM via orientation averaging approach. For wicking under confined state, the structural parameters have been updated under defined level of compressive stresses based upon the constitutive equation derived for a planar network of fibers in AGM under transverse loading conditions. A comparison has been made between the theoretical models and experimental results of wicking behavior under unconfined and confined states. Most importantly, the presented work has highlighted the questionable validity of classic Lucas-Washburn model for predicting the wicking characteristics of AGM separator over longer time duration.

  • 12.
    Kumar, Vijay
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Rawal, Amit
    Indian Institute of Technology Delhi, India.
    Elastic Moduli of Electrospun Mats: Importance of Fiber Curvature and Specimen Dimensions2017Ingår i: Journal of The Mechanical Behavior of Biomedical Materials, ISSN 1751-6161, E-ISSN 1878-0180, Vol. 72, s. 6-13Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Success of tissue engineering relies on the architecture and properties of porous scaffolds. Electrospun nonwoven scaffolds in the form of mats are unique materials due to large surface area to volume ratio, high porosity, versatility in surface functionalities and excellent mechanical properties. Maneuvering the mechanical behavior ofthe electrospun mat is a major challenge both from theoretical and experimental perspectives. Herein, we report a two-dimensional (2D) analytical model of normalized elastic moduli of electrospun mats by formulating a relationship with the governing fiber and structural parameters. The analytical model of normalized mat modulush as also accounted for fiber curvature in the form of sinusoidal curve along with the specimen dimensions considered during the uniaxial tensile test. A comparison has been made between the magnitudes of normalized matmodulus obtained through predictive modeling and the experimental results adapted from the literature. In general, a good agreement has been found between the theoretical and experimental results of normalized moduli ofthe electrospun mats. An interplay of some of the governing parameters has been analyzed through parametric analysis. Through theoretical modeling, the normalized amplitude of fiber crimp via fiber diameter along withthe aspect ratio of specimen dimensions are observed to be the dominant factors responsible for modulating thenormalized mat modulus.

  • 13.
    Rao, P. V. Kameswara
    et al.
    Indian Institute of Technology Delhi, Hauz Khas, New Delhi, India.
    Rawal, Amit
    Indian Institute of Technology Delhi, Hauz Khas, New Delhi, India; Fraunhofer Institute of Industrial Mathematics (ITWM), Fraunhofer-Platz 1, D-67663 Kaiserslautern, Germany.
    Kumar, Vijay
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Rajput, Krishn Gopal
    Indian Institute of Technology Delhi, Hauz Khas, New Delhi, India.
    Compression-recovery model of absorptive glass mat (AGM) separator guided by X-ray micro-computed tomography analysis2017Ingår i: Journal of Power Sources, ISSN 0378-7753, E-ISSN 1873-2755, Vol. 365, s. 389-398Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Absorptive glass mat (AGM) separators play a key role in enhancing the cycle life of the valve regulated lead acid (VRLA) batteries by maintaining the elastic characteristics under a defined level of compression force with the plates of the electrodes. Inevitably, there are inherent challenges to maintain the required level of compression characteristics of AGM separators during the charge and discharge of the battery. Herein, we report a three-dimensional (3D) analytical model for predicting the compression-recovery behavior of AGM separators by formulating a direct relationship with the constituent fiber and structural parameters. The analytical model of compression-recovery behavior of AGM separators has successfully included the fiber slippage criterion and internal friction losses. The presented work uses, for the first time, 3D data of fiber orientation from X-ray micro-computed tomography, for predicting the compression-recovery behavior of AGM separators. A comparison has been made between the theoretical and experimental results of compression-recovery behavior of AGM samples with defined fiber orientation characteristics. In general, the theory agreed reasonably well with the experimental results of AGM samples in both dry and wet states. Through theoretical modeling, fiber volume fraction was established as one of the key structural parameters that modulates the compression hysteresis of an AGM separator.

  • 14.
    Rawal, Amit
    et al.
    Indian Institute of Technology Delhi, New Delhi, India; Fraunhofer Institute for Industrial Mathematics (ITWM), Kaiserslautern, Germany; Institut für Textil- und Verfahrenstechnik, Denkendorf, Germany.
    Kumar, Vijay
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Hietel, Diemtar
    Fraunhofer Institute for Industrial Mathematics (ITWM), Kaiserslautern, Germany.
    Dauner, Martin
    Institut für Textil- und Verfahrenstechnik, Denkendorf, Germany.
    Modulating the Poisson’s ratio of articular cartilage via collagen fibril alignment2017Ingår i: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 194, s. 45-48Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Articular cartilage possesses unique structure and composition giving rise to unusual mechanical behavior. Typically, it is a structurally graded material that displays variation in mechanical properties along the depth. In this communication, the geometrical probability approach has been used for predicting the in-plane Poisson’s ratio in the surface and middle zones of articular cartilage. The presented model has formulated a relationship between the Poisson’s ratio and collagen fibril alignment. A comparison has been made between the theoretical and experimental findings of Poisson’s ratio in the surface and middle zones of human patella cartilage, as obtained from the literature.

  • 15.
    Rawal, Amit
    et al.
    Indian Institute of Technology Delhi; Fraunhofer Institute for Industrial Mathematics (ITWM); Institut für Textil- und Verfahrenstechnik.
    Kumar, Vijay
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Saraswat, Harshvardhan
    MLV Textile & Engineering College.
    Weerasinghe, Dakshitha
    Institut für Textil- und Verfahrenstechnik.
    Hietel, Dietmar
    Fraunhofer Institute for Industrial Mathematics (ITWM).
    Dauner, Martin
    Institut für Textil- und Verfahrenstechnik.
    Creating three-dimensional (3D) fiber networks with out-of-plane auxetic behavior over large deformations2017Ingår i: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 52, nr 5, s. 2534-2548Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Fiber networks with out-of-plane auxetic behavior have been sporadically investigated. One of the major challenges is to design such materials with giant negative Poisson’s ratio over large deformations. Here in, we report a systematic investigation to create three-dimensional (3D) fiber networks in the form of needlepunched nonwoven materials with out-of-plane auxetic behavior over large deformations via theoretical modeling and extensive set of experiments. The experimental matrix has encapsulated the key parameters of the needlepunching nonwoven process. Under uniaxial tensile loading, the anisotropy coupled with local fiber densification in networks has yielded large negative Poisson’s ratio (up to −5.7) specifically in the preferential direction. The in-plane and out-of-plane Poisson’s ratios of fiber networks have been predicted and, subsequently, compared with the experimental results. Fiber orientation was found to be a core parameter that modulated the in-plane Poisson’s ratio of fiber networks. A parametric analysis has revealed the interplay between the anisotropy of the fiber network and the out-of-plane Poisson’s ratio based upon constant volume consideration.

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