Download or read book The Response of Woven Textile Materials to Transverse Ballistic Impact written by C. R. Cork and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Response of Woven Textile Materials to Transverse Ballisti Impact written by C. R. Cork and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Analysis of the System Effects in Woven Fabrics Under Ballistic Impact written by and published by . This book was released on 1992 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Following a brief review of prior work on fabric-based armor systems, the system effects that occur during the ballistic impact of woven fabric body armor materials are discussed from a conceptual framework developed to relate single yarn impact mechanics to fabric impact mechanics. The consequence of assembling yarns into single-ply fabric structures is discussed from this perspective. A steep strain gradient along yarns in the region of the transverse deflection of the fabric is related to the constraint imposed on them by neighboring yarns. Striking and residual velocity data, collected for single-ply fabric systems of Spectra, Kevlar 29, and nylon with various different yarn deniers and weave types, are used to establish the response of spaced armor systems. The system effects of assembling fabric plies into body armor systems are determined by comparing the response of spaced armor systems to actual multiple-ply systems. There is a pronounced decrease in energy absorption capacity for the Spectra and nylon systems.
Download or read book Transverse Impact of Ballistic Fibers and Yarns written by Subramani Sockalingam and published by . This book was released on 2016 with total page 277 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ballistic impact onto flexible textile fabrics is a complicated multi-scale problem owing to the structural hierarchy of the materials, anisotropic material behavior, projectile geometry, impact velocity and boundary conditions. While this subject has been an active area of research for decades, the fundamental mechanisms such as material failure, dynamic response and multi-axial loading occurring at lower length scales during impact are not well understood. This work provides new insights into the fundamental deformation and failure mechanisms during ballistic impact onto textile fabrics at the micron length scale. In this research, a hybrid computational-experimental systematic approach is adopted to understand the mechanisms and deformation modes of high performance polymer fibers, specifically Kevlar KM2, that is widely used in ballistic impact applications. Fiber length-scale 3D finite element (FE) models are developed to better understand and complement the complicated transverse impact experiments. The fiber length-scale study suggests that fibers are subjected to multiaxial stress states including transverse compression, axial tension, axial compression and transverse shear significant enough to cause fibrillation in the fiber during impact. A dispersive flexural wave mode is predicted by the model due to the finite longitudinal shear modulus of the fiber. The flexural wave induces curvature in the fiber significant enough to cause compressive kinking and, in turn, local fibrillation in the fiber. A fiber length-scale yarn model is developed by explicitly modeling all the 400 fibers in a KM2 600 denier yarn. The yarn transverse compression results show that fiber-fiber contact plays a significant role in the spreading and deformation of individual fibers that is consistent with experimental results. When subjected to transverse impact, the model indicates significant transverse compressive strains in the fiber that increase with impact velocity and a flexural wave that induces curvatures in the fibers significant enough to induce compressive kinking and fibrillation. In addition to the transverse wave, a spreading wave develops due to fiber-fiber contact interaction that spreads the fibers to a large extent resulting in non-uniform loading and progressive failure of fibers within the yarn. Guided by the computational models, single-fiber micromechanical experiments for axial compressive kinking and transverse compression deformation modes are developed. The average tensile strength of the kinked fibers is found to be reduced by 7% compared to the virgin fibers. An experimental methodology is developed to determine the single fiber constitutive behavior in quasi-static transverse compression by removing the geometric nonlinearity due to the growing contact area. The fibers exhibit nonlinear inelastic behavior under large compressive strains. The fibers subjected to 60% nominal strains (80% true strains) showed a 20% reduction in average tensile strength compared to the virgin fibers. A nonlinear inelastic constitutive model is implemented as a user defined material (UMAT) suitable for the commercial FE code LS-DYNA explicit analysis. During impact, the inelastic behavior results in a significant reduction in the fiber bounce velocity and a reduction in the projectile-fiber contact forces by 40% compared to an elastic constitutive behavior. The inelastic dissipation and reduced bounce leads to an inelastic collision rather than an elastic collision. The longitudinal shear modulus and the inelastic behavior are found to govern the failure response of the fibers during impact. Modeling the single fiber quasi-static multiaxial loading experiments indicate fiber failure may be initiated based on a gage length dependent maximum axial tensile strain in the fiber. Regardless of the material behavior (elastic or inelastic), fiber length-scale impact models show a gradient in the axial tensile strain (stress) in the fiber cross section at the location of failure consistent with multiaxial loading experimental observations. Fiber-level yarn breaking speed predictions based on a maximum axial tensile strain (stress) criterion are much lower than the breaking speed based on classical theory and they are consistent with experimental measurements. Therefore, the reduction in experimental yarn breaking speed compared to theoretical Smith solution is attributed to the stress concentration and property degradation mechanisms due to multiaxial stress states at the location of failure.
Download or read book Response on Non woven Synthetic Fiber Textiles to Ballistic Impact written by Thomas W. Ipson and published by . This book was released on 1966 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this program was to define the transient behavior of the felt and the force interaction between it and the projectile. Six felt samples (nylon (3), orlon, dacron, polyproplylene) were tested using the 17-grain fragment simulating projectile at various velocities up to and greater than the ballistic limit velocity. Graphical differentiation was used to obtain velocity-time, force-time, and force-distance relationships. Qualitative evaluations reveal that strength, elongation, and transverse wave velocity are the three predominant parameters in determining effectiveness. The energy absorbed by a felt is maximum at the ballistic limit velocity and decreases dramatically at higher (complete perforation) velocities. An analytical model based upon momentum considerations is compared to the experimental results. (Author).
Download or read book Military Textiles written by E. Wilusz and published by Elsevier. This book was released on 2008-05-21 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: Textiles for military uniforms face a complex set of challenges. They must provide protection, durability and comfort in a wide range of hostile environments. Military textiles reviews the range of recent research on how military clothing can best meet soldiers’ needs. The first part of the book reviews general requirements of military textiles, including damage resistance, comfort, sweat management, cold-weather conditions and the integration of high-tech materials into uniforms. Part II concentrates on the protective role of military textiles, covering such areas as high-performance ballistic fibres, textiles for chemical and biological protection, camouflage materials and military fabrics for flame protection. The book also reviews the use of non-woven fabrics and new coatings for military applications. With its distinguished editor and international team of contributors, Military textiles is a valuable reference for those researching and manufacturing military textiles, as well as those interested in the wider area of textiles for protection. Reviews the range of recent research on how military clothing can best meet soldier’s needs Examines damage resistance, sweat management and comfort Discusses the protective role of military textiles
Download or read book Proceedings of the International Colloquium in Textile Engineering Fashion Apparel and Design 2014 ICTEFAD 2014 written by Mohd Rozi Ahmad and published by Springer. This book was released on 2014-09-25 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book is a collection of academic papers from a conference that focuses on significant issues, fundamental and applied research advances on a range of topics in the areas of textile engineering, apparel, fashion and design. Among others, the book will update the readers on recent research in technical and functional textiles; future trends and visions for textile, apparel and fashion; global business, marketing and management in textile and apparel; education and training in textile and apparel and design, fashion, footwear product and materials innovation.
Download or read book Advanced Fibrous Composite Materials for Ballistic Protection written by Xiaogang Chen and published by Woodhead Publishing. This book was released on 2016-01-21 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced Fibrous Composite Materials for Ballistic Protection provides the latest information on ballistic protection, a topic that remains an important issue in modern times due to ever increasing threats coming from regional conflicts, terrorism, and anti-social behavior. The basic requirements for ballistic protection equipment are first and foremost, the prevention of a projectile from perforating, the reduction of blunt trauma to the human body caused by ballistic impact, the necessity that they are thermal and provide moisture comfort, and that they are lightweight and flexible to guarantee wearer’s mobility. The main aim of this book is to present some of the most recent developments in the design and engineering of woven fabrics and their use as layering materials to form composite structures for ballistic personal protection. Chapter topics include High Performance Ballistic Fibres, Ultra-High Molecular Weight Polyethylene (UHMWPE), Ballistic Damage of Hybrid Composite Materials, Analysis of Ballistic Fabrics and Layered Composite Materials, and Multi-Scale Modeling of Polymeric Composite Materials for Ballistic Protection. Contributions from leading experts in the field Cutting edge developments on the engineering of ballistic materials Comprehensive analysis of the development and uses of advanced fibrous composite materials
Download or read book Atlas of Fibre Fracture and Damage to Textiles written by J. W. S. Hearle and published by Woodhead Publishing. This book was released on 1998 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on over 25 years of research at the University of Manchester Institute of Science & Technology, this book contains more than 1,500 scanning electron micrographs and other pictures, offering a unique collection of documentary information. The explanatory text presents fiber and polymer scientists an explanation of fracture mechanisms and outlines way to maximize textile life span, enabling textile technologists and design engineers to manufacture improved textile products, and helping forensic scientists to identify cause of failure.
Download or read book Wellington Sears Handbook of Industrial Textiles written by Sabit Adanur and published by Routledge. This book was released on 2017-11-22 with total page 862 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Wellington Sears Handbook of Industrial Textiles has been a widely used textile industry reference for more than 50 years. Now a completely updated new edition has been published. It was prepared by a team of industrial textile specialists at Auburn University to provide both technical and management personnel with a comprehensive resource on the current technology and applications of today's industrial textiles. All aspects of industrial textiles are covered: man-made and natural materials, manufacturing and finishing methods, and all applications. There are also sections on properties, testing, waste management, computers and automation, and standards and regulations. The appendices provide extensive reference data: properties, specifications, manufacturers and trade names, mathematical equations and measurement units. The text is organized for easy reference, and well illustrated with hundreds of schematics and photographs.
Download or read book Proceedings of the Army Symposium on Solid Mechanics 1972 written by and published by . This book was released on 1973 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advanced Textile Engineering Materials written by Shahid Ul Islam and published by John Wiley & Sons. This book was released on 2018-08-15 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt: A groundbreaking book on the recent advances in chemical finishing, innovative fabrication strategies frequently adopted for the mechanical finishing of textiles, as well as the environmental issues in textile sectors Advanced materials are undoubtedly becoming very popular as substitutes for traditional materials in the textile engineering field. Advanced textile engineering materials are giving way to innovative textile materials with novel functions and are widely perceived as offering huge potential in a wide range of applications such as healthcare, defense, personal protective equipment, textile antennas, garments for motion capture, and sensors, etc. Advanced Engineering Textile Materials contains 13 chapters written by high profile contributors with many years of experience in textile technology, and cover fundamental and advanced approaches associated with the design and development of textile implants, conductive textiles, 3D textiles, smart-stimuli textiles, antiballistic textiles and fabric structures designed for a medical application intrabody/extra-body, implantable/non-implantable) and various modification and processing techniques.
Download or read book Advances in Predictive Models and Methodologies for Numerically Efficient Linear and Nonlinear Analysis of Composites written by Marco Petrolo and published by Springer. This book was released on 2019-02-24 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers contributions addressing issues related to the analysis of composite structures, whose most relevant common thread is augmented numerical efficiency, which is more accurate for given computational costs than existing methods and methodologies. It first presents structural theories to deal with the anisotropy of composites and to embed multifield and nonlinear effects to extend design capabilities and provide methods of augmenting the fidelity of structural theories and lowering computational costs, including the finite element method. The second part of the book focuses on damage analysis; the multiscale and multicomponent nature of composites leads to extremely complex failure mechanisms, and predictive tools require physics-based models to reduce the need for fitting and tuning based on costly and lengthy experiments, and to lower computational costs; furthermore the correct monitoring of in-service damage is decisive in the context of damage tolerance. The third part then presents recent advances in embedding characterization and manufacturing effects in virtual testing. The book summarizes the outcomes of the FULLCOMP (FULLy integrated analysis, design, manufacturing, and health-monitoring of COMPosite structures) research project.
Download or read book Ballistics 2011 written by Ernest Baker and published by DEStech Publications, Inc. This book was released on 2011-09 with total page 2230 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes papers that were first presented at a September 2011 conference organized by the National Defense Industrial Association and the International Ballistics Society. This title includes a CD-ROM that displays figures and illustrations in articles in full color along with a title screen and main menu screen.
Download or read book Finite Element Analysis of Woven Fabric Body Armor Under Ballistic Impacts written by Matthew C. DiSogra and published by . This book was released on 2013 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this research was to use finite element modeling and simulations to evaluate the ballistic resistance of woven fabrics and soft body armor. In the work of this thesis, nonlinear finite element simulations were performed to evaluate the response of single- and multi-layer woven fabrics under ballistic impacts. A shell-element based fabric material model was first validated using perforation tests performed on a single-layer fabric under high-velocity impact by a spherical steel projectile. The validated model was then used to replicate high- and low-velocity impacts by a blunt aluminum projectile on eight-layer Kevlar targets. Results from the multi-layer simulations were shown to have good agreement with experimental data. Finally, the validated fabric model was used to simulate a full-scale ballistic test on a groin protector panel of the Interceptor Body Armor system. The simulation results of both the single- and multi¬layer impacts were shown to match well with experimental data in terms of the projectile's residual velocities. This research confirms the effectiveness of the fabric model and can be extended to a wide range of applications involving soft body armors.
Download or read book Dynamic Behavior of Materials Volume 1 written by Jamie Kimberley and published by Springer. This book was released on 2017-10-29 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamic Behavior of Materials, Volume 1 of the Proceedings of the 2017 SEM Annual Conference& Exposition on Experimental and Applied Mechanics, the first volume of nine from the Conference, brings together contributions to this important area of research and engineering. The collection presents early findings and case studies on fundamental and applied aspects of Experimental Mechanics, including papers on: Quantitative Visualization Fracture & Fragmentation Dynamic Behavior of Low Impedance Materials Shock & Blast Dynamic Behavior of Composites Novel Testing Techniques Hybrid Experimental & Computational Methods Dynamic Behavior of Geo-materials General Material Behavior
Download or read book Ballistic Impact Resistance of Multi layer Textile Fabrics written by University of Manchester Institute of Science and Technology and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
