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High Strain Rate Mechanical Properties Of Epoxy And Epoxy Based Particulate Composites Preprint
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Book Synopsis High Strain Rate Mechanical Properties of Epoxy and Epoxy-Based Particulate Composites (Preprint). by :
Download or read book High Strain Rate Mechanical Properties of Epoxy and Epoxy-Based Particulate Composites (Preprint). written by and published by . This book was released on 2007 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymers and polymer-based particulate composites are becoming increasingly used in aerospace structural applications, where they experience complex, non-static loads. Correspondingly, the high strain rate mechanical properties are of increasing importance. This paper investigates the properties of epoxy - bisphenol-A/diethanolamine epoxy (Epon 826/DEA) - and epoxy-based particulate composites across strain rates from 10(exp -3) to 10(exp 5) /s. The samples were tested using Instron, traditional split Hopkinson pressure bars (SHPBs) and a miniaturized SHPB for ultra-high strain rates. Additionally, the epoxy samples are tested with dynamic mechanical analysis to look at the effects of time-temperature superposition on the strain rate effects in the samples. The results of the testing are compared to the Hasan-Boyce model for polymers, which has shown good agreement with other epoxy studies, to develop constitutive equations for these materials.
Book Synopsis Microstructure and Strain Rate Effects on the Mechanical Behavior of Particle Reinforced Epoxy-based Reactive Materials by : Bradley William White
Download or read book Microstructure and Strain Rate Effects on the Mechanical Behavior of Particle Reinforced Epoxy-based Reactive Materials written by Bradley William White and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of reactive metal particles on the microstructure and mechanical properties of epoxy-based composites are investigated in this work. To examine these effects castings of epoxy reinforced with 20-40 vol.% Al and 0-10 vol.% Ni were prepared, while varying the aluminum particle size from 5 to 50 microns and holding the nickel particle size constant at 50 microns. In total eight composite materials were produced, possessing unique microstructures. The microstructure is quantitatively characterized and correlated with the composite constitutive response determined from quasi-static and dynamic compressive loading conditions at strain-rates from 1e-4 to 5e3 /s. Microstructures from each composite and at each strain rate were analyzed to determine the amount of particle strain as a function of bulk strain and strain rate. Using computational simulations of representative microstructures of select composites, the epoxy matrix-metallic particle and particle-particle interactions at the mesoscale under dynamic compressive loading conditions were further examined. From computational simulation data, the stress and strain localization effects were characterized at the mesoscale and the bulk mechanical behavior was decomposed into the individual contributions of the constituent phases. The particle strain and computational analysis provided a greater understanding of the mechanisms associated with particle deformation and stress transfer between phases, and their influence on the overall mechanical response of polymer matrix composites reinforced with metallic particles. The highly heterogeneous composite microstructure and the high contrasting properties of the individual constituents were found to drive localized deformations that are often more pronounced than those in the bulk material. The strain rate behavior of epoxy is shown to cause a strain rate dependent deformation response of reinforcement particle phases that are typically strain rate independent. Additionally, the epoxy matrix strength behavior was found to have a higher dependence on strain rate due to the presence of metal particle fillers. Discrepancies between experimental and simulation mechanical behavior results and these findings indicate a need for epoxy constitutive models to incorporate effects of particle reinforcement on the mechanical behavior.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721008360 Total Pages :98 pages Book Rating :4.0/5 (83 download)
Book Synopsis Study of High Strain Rate Response of Composites by : National Aeronautics and Space Administration (NASA)
Download or read book Study of High Strain Rate Response of Composites written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-11 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of the research was to continue the experimental study of the effect of strain rate on mechanical response (deformation and failure) of epoxy resins and carbon fibers/epoxy matrix composites, and to initiate a study of the effects of temperature by developing an elevated temperature test. The experimental data provide the information needed for NASA scientists for the development of a nonlinear, rate dependent deformation and strength models for composites that can subsequently be used in design. This year effort was directed into testing the epoxy resin. Three types of epoxy resins were tested in tension and shear at various strain rates that ranges from 5 x 10(exp -5), to 1000 per second. Pilot shear experiments were done at high strain rate and an elevated temperature of 80 C. The results show that all, the strain rate, the mode of loading, and temperature significantly affect the response of epoxy.Gilat, AmosGlenn Research CenterSTRAIN RATE; EPOXY MATRIX COMPOSITES; EPOXY RESINS; MECHANICAL PROPERTIES; TORSIONAL STRESS; DEFORMATION; SHEAR STRAIN; NONLINEARITY; HIGH TEMPERATURE TESTS; STRESS-STRAIN DIAGRAMS; TENSILE TESTS; STRUCTURAL FAILURE
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721651221 Total Pages :34 pages Book Rating :4.6/5 (512 download)
Book Synopsis High Strain-Rate and Temperature Effects on the Response of Composites by : National Aeronautics and Space Administration (NASA)
Download or read book High Strain-Rate and Temperature Effects on the Response of Composites written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-21 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of the research is to expand the experimental study of the effect of strain rate on mechanical response (deformation and failure) of epoxy resins and carbon fibers/epoxy matrix composites, to include elevated temperature tests. The experimental data provide the information needed for NASA scientists for the development of a nonlinear, strain rate and temperature dependent deformation and strength models for composites that can subsequently be used in design. This year effort was directed into the development and testing of the epoxy resin at elevated temperatures. Two types of epoxy resins were tested in shear at high strain rates of about 700 per second and elevated temperatures of 50 and 80 C. The results show that the temperature significantly affects the response of epoxy. Gilat, Amos Glenn Research Center
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781724674265 Total Pages :378 pages Book Rating :4.6/5 (742 download)
Book Synopsis Temperature Effects on High Strain Rate Properties of Graphite/Epoxy Composites by : National Aeronautics and Space Administration (NASA)
Download or read book Temperature Effects on High Strain Rate Properties of Graphite/Epoxy Composites written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-04 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: A unidirectional graphite epoxy material (AS4/3501-6) was characterized at strain rates ranging from 5 x 10(exp 6) s(exp -1) to 5(exp -1), at room temperature and at 128 C. Results are presented in the form of stress-strain curves to failure. The longitudinal properties remain nearly unchanged with strain rate and temperature. The transverse modulus increases with strain rate but decreases with temperature. The transverse strength and transverse ultimate tensile strain have a positive rate sensitivity at low rates, which changes to negative at intermediate rates and returns to positive rate sensitivity at the highest rates tested. A temperature-time equivalence principle was applied and master curves were obtained for the transverse mechanical properties. The in-plane shear modulus and in-plane shear strength have a positive rate sensitivity. The ultimate intralaminar shear strain has a positive rate sensitivity at low rates, which changes to negative at high rates. At the elevated temperature of 128 C, the ultimate shear strain is 25 to 30 percent higher than the room temperature value, but its strain rate dependence is moderate. Yaniv, G. and Daniel, I. M. and Cokeing, S. and Martinez, G. M. Unspecified Center NASA-CR-189082, NAS 1.26:189082 IIT-5-54601; NAG3-423; RTOP 505-63-5B...
Book Synopsis Environmental and Strain Rate Effects on Graphite/epoxy Composites by : Konstantinos Peimandis
Download or read book Environmental and Strain Rate Effects on Graphite/epoxy Composites written by Konstantinos Peimandis and published by . This book was released on 1991 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Epoxy-Based Composites by : Samson Jerold Samuel Chelladurai
Download or read book Epoxy-Based Composites written by Samson Jerold Samuel Chelladurai and published by BoD – Books on Demand. This book was released on 2022-05-25 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Epoxy-based composites are used in automotive and aerospace applications because of their high strength-to-weight ratio, high stiffness-to-weight ratio, and good resistance to wear and corrosion. This book presents research on epoxy-based composites and their applications. It explains methods of preparing and testing these composites, including the hand lay-up technique, compression molding, and others. This book is useful for industrialists, undergraduate and postgraduate students, research scholars, and scientists.
Book Synopsis The Effect of Additives on Thermal and Mechanical Properties of Epoxy by : Asmaa Al-Gurabi
Download or read book The Effect of Additives on Thermal and Mechanical Properties of Epoxy written by Asmaa Al-Gurabi and published by LAP Lambert Academic Publishing. This book was released on 2013 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymeric materials and natural adhesives may serve adhesive functions. Polymer adhesives may be used to join a large variety of material combinations: metal-metal, metal-polymer, metal-ceramic, and so on. Thermosets, such as epoxies, are now widely used as structural matrices for high-performance composites and as adhesives in joints.The properties that can be improved by forming a composite material include strength, stiffness, corrosion resistance, wears resistance, attractiveness, weight, fatigue life, temperature dependent behavior, and thermal conductivity Particulate composite materials are composed of two phases. The first phase is termed matrix, which is continuous and surrounds the other phase, which is often called the dispersed phase In this study, the mechanical (bending and tensile adhesion force) and thermal (thermal conductivity) properties were studied. Particulate composites consist of epoxy as a matrix with metal (Al, Cu, and Fe) and metal oxides as particle fillers.
Book Synopsis Strain Rate Effects in Particulate-filled Epoxy by : Russell Andrew Johnson
Download or read book Strain Rate Effects in Particulate-filled Epoxy written by Russell Andrew Johnson and published by . This book was released on 1970 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High Strain Rate Properties of IM-7/977-3 Graphite/epoxy Composites by : Jeffrey R. Focht
Download or read book High Strain Rate Properties of IM-7/977-3 Graphite/epoxy Composites written by Jeffrey R. Focht and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High Strain Rate Properties of Unidirectional Composites, Part 1 by :
Download or read book High Strain Rate Properties of Unidirectional Composites, Part 1 written by and published by . This book was released on 1991 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mechanical Properties of EPON 826/DEA Epoxy by :
Download or read book Mechanical Properties of EPON 826/DEA Epoxy written by and published by . This book was released on 2008 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymers are becoming increasingly used in aerospace structural applications, where they experience complex, non-static loads. Correspondingly, the mechanical properties at high strain rates are of increasing importance in these applications. This paper investigates the compressive properties of Epon 826 epoxy resin cured with diethynolamine (DEA) across strain rates from 10( -3) to 10(4) s( -1). Specimens were tested using an Instron mechanical testing machine for static loading, traditional split Hopkinson pressure bars (SHPBs) for high strain rates, and a miniaturized SHPB for ultra-high strain rates. Additionally, the material was tested using dynamic mechanical analysis to determine the effects of time and temperature equivalences on the strain rate behavior of the samples. The experimental data is used to fit the Mulliken-Boyce model, modified for one-dimension, which is able to capture the compressive mechanical properties over a range of strain rates.
Book Synopsis Full-field Strain and Temperature Measurement of Epoxy Resin Pr-520 Subjected to Tensile, Compressive, and Torsional Loading at Various Strain Rates by : Mark Joseph Konieczny
Download or read book Full-field Strain and Temperature Measurement of Epoxy Resin Pr-520 Subjected to Tensile, Compressive, and Torsional Loading at Various Strain Rates written by Mark Joseph Konieczny and published by . This book was released on 2019 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: With aircraft and aircraft engine manufacturers’ goal to create lighter more efficient components, there has been a trend of replacing traditional aircraft materials such as aluminum and titanium with various composites. The high strength to weight ratio, and application specific manufacturing of composites, make them excellent candidates for components such as fan blades, engine cases, fuselages, and even parts of wings. However, from the rigorous testing that must be passed to certify airworthiness, comes a need for computational modeling of these composite components to greatly reduce the costs incurred from manufacturing to final testing. Some of the most costly testing comes from the blade out engine test to prove that a fan blade dislodged from the rotor will be contained by the engine case. When attempting to model an impact situation, where the force is applied transversely to the case, it becomes necessary to know the properties of the polymer matrix, because it is the primary factor affecting the strain rate dependency and failure of the composite as a whole.
Book Synopsis Aluminum, Steel, and Organic Reinforced Epoxy Systems by : Carlos J. Hilado
Download or read book Aluminum, Steel, and Organic Reinforced Epoxy Systems written by Carlos J. Hilado and published by . This book was released on 1974 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Incorporation of Mean Stress Effects Into the Micromechanical Analysis of the High Strain Rate Response of Polymer Matrix Composites by :
Download or read book Incorporation of Mean Stress Effects Into the Micromechanical Analysis of the High Strain Rate Response of Polymer Matrix Composites written by and published by . This book was released on 2002 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Comparison of Static and Dynamic Mechanical Properties of Some Epoxy-Matrix Composites by : Jenness, JR.
Download or read book Comparison of Static and Dynamic Mechanical Properties of Some Epoxy-Matrix Composites written by Jenness, JR. and published by . This book was released on 1974 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Static and dynamic elastic moduli in flexure were measured for a diglycidyl ether of bisphenol A cured with metaphenylenediamine and some particulate composites with this polymer as the matrix. If it is assumed that these materials have tensile moduli which are about 0.925 of their compressive moduli, as has been noted for another epoxy system, dynamic moduli determined at very low strain values by a free-free flexural resonance technique appear to be very nearly equal to the tensile moduli in static flexure. However, little correlation was observed between the dynamic mechanical properties and other static properties such as flexural strength. This is partially attributed to the difference in stress patterns in the static and dynamic tests.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt:
