Development Of Kolsky Bar Techniques And The Experimental Characterization Of Ultra High Molecular Weight Polyethylene Composites
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Development Of Kolsky Bar Techniques And The Experimental Characterization Of Ultra High Molecular Weight Polyethylene Composites
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Author : Thomas Hannah
language : en
Publisher:
Release Date : 2023
Development Of Kolsky Bar Techniques And The Experimental Characterization Of Ultra High Molecular Weight Polyethylene Composites written by Thomas Hannah and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023 with categories.
The goal of this work is twofold. One part is to develop both the experimental techniques and advanced finite element modeling techniques necessary for understanding and analyzing data collected using a miniature 3.16 mm diameter Kolsky bar or Split Hopkinson Pressure Bar for high rate experimentation. Additionally, a robust analysis technique to gather statistically significant data is developed to simplify the experimental data gathering process and ensure the significance of the results. The work focuses mainly of the development of the Kolsky equipment and techniques, as well as methods for identifying error sources during testing. Additionally, models of the SHPB system have been generated using the finite element code Abaqus®, and are used throughout the project to aid in system characterization and experimental design efforts. Special attention is paid to the differences between miniature systems and full size ones, especially where data collection rates and sampling frequency are concerned. The use and characterization of paper pulse shapers is also developed to aid in the testing of UHMWPE samples at rates in excess of 10^4 strain per second. The second aspect of this work is to apply these techniques to the characterization of Dyneema® which is a composite consisting of Ultra High Molecular Weight Polyethylene (UHMWPE) fibers set in a polymer matrix, in this case HB26 hard laminate. Additionally, this work entails the design and implementation of full scale high speed impact tests using UHMWPE targets in multiple configurations to examine the variation in response due to a change in initial conditions and to evaluate the change in damage mechanisms. Finally, high resolution Computer Tomography or CT scans are used to evaluate the damage mechanisms observed in both the Kolsky bar testing and the plate impact testing nondestructively and without otherwise effecting the failure surfaces and structures. Mechanisms displayed in the Kolsky experiments are then compared to those observed in the plate impact tests to determine if and where the type of data collected from Kolsky bar tests can be applied to any future modeling efforts of the composite. Three fundamental knowledge gaps to be addressed in this work are: 1) Can a newer generation of "miniature" Kolsky bars generate repeatable and reproducible data? 2) How does Dyneema® respond differently increasing the strain rate from 10^3 strain per second to 10^4 strain per second? 3) Are there similar damage mechanisms seen in small scale Kolsky tests and large scale impact tests, and where could the Kolsky bar data be applied to future modeling efforts?
Kolsky Bar Experiment For High Rate Large Deformations Of Polycarbonate
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Author : Jason G. Vogeler
language : en
Publisher:
Release Date : 2013
Kolsky Bar Experiment For High Rate Large Deformations Of Polycarbonate written by Jason G. Vogeler and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Polycarbonate (PC) is a tough, transparent engineering thermoplastic. Its impact strength and ability undergo large plastic deformations without shatter make PC an ideal protective material for impact-resilient eyewear, aircraft windows and transparent armor. A good understanding of the response of this material to large deformations at high strain rates is critical for its utilization in these applications. To this end, a striker-less Kolsky bar device is employed in this work for the needed material characterization. The apparatus allow impulsive torsion and/or compression loadings with pulse durations sufficiently long for the plastic flow behavior to develop fully. Three new testing techniques based on the device are developed and applied to measure the response of PC to large plastic deformations of various modes at various strain rates and under various temperatures. The first new technique is a modified torsional Kolsky bar method that loads the PC sample in high rate of simple shear. In addition to measuring the shear stress as the conventional method, the new technique also measures the axial stress induced by shear deformation. The measurements show that the material expands as it undergoes elastic shear and contracts as the shear becomes increasingly plastic. The results for the elastic response confirm the prediction by a non-linear elastic model for PC. The second new technique applies a static axial compression to the sample before dynamic shear loading. The experiments with this technique seek to determine if and to what extent the deviatoric yield and flow stresses of PC are affected by the volumetric stress. For the stress states examined, both the deviatoric yield and flow stresses show linear dependence on the compressive volumetric stress. The final Kolsky bar technique developed uses a friction clamp to store and release a compressive pulse. This new technique allows for loading pulses that are much longer than the achievable pulses in the traditional split Hopkinson bar tests. They are sufficient for the material flow behavior to develop fully in the compressive strain rate range of mid hundreds to lower thousands per second. Tests with the technique are performed on PC over an array of temperatures and strain rates. The temperature and strain rate dependences of the yield and flow stresses under dynamic compression are studied. The volumetric stresses are considerably more intense for the compression tests than for the torsion tests and combined compression-torsion tests. The data from the three types of tests together indicates consistent pressure-dependent increases in the deviatoric yield and flow stresses of PC subjected to high-rate large deformations.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1995
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Aeronautics categories.
Metals Handbook Comprehensive Index
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Author : ASM Handbook Committee
language : en
Publisher: ASM International(OH)
Release Date : 1987
Metals Handbook Comprehensive Index written by ASM Handbook Committee and has been published by ASM International(OH) this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Technology & Engineering categories.
Split Hopkinson Kolsky Bar
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Author : Weinong W. Chen
language : en
Publisher: Springer Science & Business Media
Release Date : 2010-11-11
Split Hopkinson Kolsky Bar written by Weinong W. Chen and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-11-11 with Technology & Engineering categories.
The authors systematically describe the general principles of Kolsky bars, or split Hopkinson bars, which are widely used for obtaining dynamic material properties. Modifications are introduced for obtaining reliable data. Specific experiment design guidelines are provided to subject the specimen to desired testing conditions. Detailed Kolsky-bar examples are given for different classes of materials (brittle, ductile, soft, etc) and for different loading conditions (tension, torsion, triaxial, high/low temperatures, intermediate strain rate, etc). The Kolsky bars used for dynamic structural characterization are briefly introduced. A collection of dynamic properties of various materials under various testing conditions is included which may serve as a reference database. This book assists both beginners and experienced professionals in characterizing high-rate material response with high quality and consistency. Readers who may benefit from this work include university students, instructors, R & D professionals, and scholars/engineers in solid mechanics, aerospace, civil and mechanical engineering, as well as materials science and engineering.
Mechanics Of Solid Polymers
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Author : Jorgen S Bergstrom
language : en
Publisher: William Andrew
Release Date : 2015-07-11
Mechanics Of Solid Polymers written by Jorgen S Bergstrom and has been published by William Andrew this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-07-11 with Technology & Engineering categories.
Very few polymer mechanics problems are solved with only pen and paper today, and virtually all academic research and industrial work relies heavily on finite element simulations and specialized computer software. Introducing and demonstrating the utility of computational tools and simulations, Mechanics of Solid Polymers provides a modern view of how solid polymers behave, how they can be experimentally characterized, and how to predict their behavior in different load environments. Reflecting the significant progress made in the understanding of polymer behaviour over the last two decades, this book will discuss recent developments and compare them to classical theories. The book shows how best to make use of commercially available finite element software to solve polymer mechanics problems, introducing readers to the current state of the art in predicting failure using a combination of experiment and computational techniques. Case studies and example Matlab code are also included. As industry and academia are increasingly reliant on advanced computational mechanics software to implement sophisticated constitutive models – and authoritative information is hard to find in one place - this book provides engineers with what they need to know to make best use of the technology available. Helps professionals deploy the latest experimental polymer testing methods to assess suitability for applications Discusses material models for different polymer types Shows how to best make use of available finite element software to model polymer behaviour, and includes case studies and example code to help engineers and researchers apply it to their work
Carbon Nanotube Fibres And Yarns
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Author : Menghe Miao
language : en
Publisher: Woodhead Publishing
Release Date : 2019-09-14
Carbon Nanotube Fibres And Yarns written by Menghe Miao and has been published by Woodhead Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-09-14 with Technology & Engineering categories.
Carbon Nanotube Fibres and Yarns for Smart Textiles: Production, Properties and Applications in Smart Textiles explains the relevance of carbon nanotube science and provides new insights on this emerging, high-performance textile material. Particular emphasis is placed on applications in smart textiles and wearable electronics applications, such as flexible sensors, actuators and energy sources. This collection examines the state-of-the-art in carbon nanotube (CNT) research, providing guidance for anyone who is exploring problems where CNTs may provide design solutions. Finally, the book addresses advances in yarn spinning methods, yarn structures and properties. Drawing on his experience in the textile industry, the book's editor presents academic research in a way that is comprehensible and useful to materials scientists and engineers in practice. Explains how carbon nanotube science can meet the challenging requirements of important and emerging smart textiles and wearable electronics applications Reviews and analyzes key developments on CNT yarn spinning methods, yarn structures and properties, and proposed applications Addresses the potential applications of CNT yarns and nanocomposite fibers
Practical Guide To Polyethylene
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Author : Cornelia Vasile
language : en
Publisher: iSmithers Rapra Publishing
Release Date : 2005
Practical Guide To Polyethylene written by Cornelia Vasile and has been published by iSmithers Rapra Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Science categories.
This practical guide begins with general background to the polyethylene family, with price, production and market share information. It describes the basic types of polyethylene including virgin and filled polyethylene, copolymers, block and graft polymers and composites, and reviews the types of additives used in polyethylene. It gives the low down on the properties, including, amongst others, rheological, mechanical, chemical, thermal, and electrical properties. It goes on to describe the processing issues and conditions for the wide range of techniques used for polyethylene, and also considers post-processing and assembly issues. It offers guidance on product design and development issues, including materials selection. It is an indispensable resource for everyone working with this material.
Nondestructive Characterization Of Materials Ii
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Author : Jean F. Bussière
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-03-14
Nondestructive Characterization Of Materials Ii written by Jean F. Bussière and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-03-14 with Technology & Engineering categories.
The possibility of nondestructively characterizing the microstruc ture, morphology or mechanical properties of materials is certainly a fascinating subject. In principle, such techniques can be used at all stages of a material's life - from the early stages of processing, to the end of a structural component's useful life. Interest in the subject thus arises not only from a purely scientific point of view but is also strongly motivated by economic pressures to improve productivity and quality in manufacturing, to insure the reliability and extend the life of existing structures. The present volume represents the edited papers presented at the Second International Symposium on the Nondestructive Characterization of Materials, held in Montreal, Canada, July 21-23, 1986. The Proceedings are divided into eight sections, which reflect the multidisciplinary nature of characterizing materials nondestructively: Polymers and Composites, Ceramics and Powder Metallurgy, Metals, Layered Structures/Adhesive Bonds/Welding, Degradation/Aging, Texture/ Anisotropy, Stress, and New Techniques. Invited papers by R. Hadcock of Grumman Aircraft Systems, R. Cannon of Rutgers University, H. Yada of Nippon Steel and R. Bridenbaugh of Alcoa review respectively the processing of polymer matrix composites, ceramics, steel and aluminum, emphasizing the need for material property sensors to improve process and quality control. Two other invited papers, one by A. Wedgwood of Harwell and the other by P. Holler of the IzFP in Saarbrucken review state of the art techniques to characterize particulate matter and metals respectively.
Physics Briefs
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Author :
language : en
Publisher:
Release Date : 1993
Physics Briefs written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Physics categories.