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Showing 1 to 20 of 22 for “"Strain Rate Effects"”.
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Strain rate effects on inelastic response of beams
Thesis (M.S.)--Michigan State University. Dept. of Civil Engineering, 1965
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Strain rate effects on the behavior of shape memory alloys
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2013.
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Strain rate effects on tensile fracture and damage tolerance of composite laminates
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1992.
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Temperature and Axial Strain Rate Effects on Micromechanical Behavior in Triaxially Compressed Marbles
… of high resolution, simultaneous stress-axial strain, volumetric strain, and acoustic emission measurements were used to survey the effects of temperature (T) and axial strain rate ((epsilon)) variations on micromechanical behavior in triaxially compressed marbles. Thirty-five tests were run on …
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Rate Effects in Fine Grained Soils
The strain rate dependent behaviour of fine grained soils is an important aspect of geotechnical engineering. During dynamic or rapid events such as earthquakes and rapid pile testing, a fine grained soil will display significantly different behaviour than may be observed over the long life span of …
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In-Situ Geotechnical Characterization of Soft Estuarine Surficial Sediments Using a Portable Free Fall Penetrometer
… empirical parameters such as the cone factor and strain rate factor hampered the derivation of geotechnical design parameters such as undrained shear strength. This challenge applies particularly in areas of more rare seabed soil conditions such as very soft estuarine sediments. This study aims to …
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A new elasto-viscoplastic model for rate-dependent behavior of clays
… with constructed fills on marine clays, or rate-dependent cyclic response of offshore foundations under wave loading. Although there are many observations on rate-dependent characteristics of clays in laboratory tests, none of the existing soil models has attained consistent descriptions of …
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Dynamic modelling of lightweight high-strength concrete under impact
… (LWHSC) under static and dynamic loadings. A new strain-based damage model is developed based on continuum damage mechanics. The proposed model incorporates the strain rate effects on various concrete properties, such as tensile and compressive strengths, critical strains and elastic moduli. In …
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Implementation and evaluation of a recently developed rate-dependent effective stress soil model 'MIT-SR'
Reliable modeling of rate-dependency in soil properties remains a major challenge for accurate solutions of many geotechnical problems. Although there are many sources of experimental data concerning rate dependent properties of clays, most pre-existing soil models have been found to have severe …
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Thin circular metal plates subjected to localised impulsive loads
… the deformation from the first, predict the strains in the plate. The first model or theoretical displacement model presents a stepwise velocity field approach, in which it is assumed that the explosive burns as a set of discretised rings spreading from the centre of the plate to the outer …
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Instabilities in Multiphysics Problems: Micro- and Nano-electromechanical Systems, and Heat-Conducting Thermoelastoviscoplastic Solids
… thermal softening overcoming hardening caused by strain- and strain-rate effects. Each of these nonlinear multiphysics problems is analyzed by the meshless local Petrov-Galerkin (MLPG) method. The moving least squares (MLS) approximation is used to generate basis functions for the trial solution, …
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Finite Element Analysis of the Application of Synthetic Fiber Ropes to Reduce Blast Response of Frames
… Energy Dissipators (SCEDs) for reducing the effects of large-scale lateral loads. Finite element models of portal frames were developed using the commercial finite element program ABAQUS and dynamic models were run for varying blasts and frame systems. Blast pressures of 100, 2,000, and 4,000 …
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A Homogenization Approach for Design and Simulation of Blast Resistant Composites
… of two different materials. The methods are integrated with dynamic simulation environments and advanced optimization algorithms. The second case study is 2-D and uses an implicit blast simulation, while the third case study is 3-D and simulates blast using the explicit blast method. Both case …
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Loading Rate Effects on Axial Pile Capacity in Clays
… can damage the pile and may not produce accurate results. There is a relatively new testing method called the Statnamic Testing Method which tests foundation piles at a very fast rate, but still slower than with dynamic tests. As the rate at which load is applied to a test pile increases, the …
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Ballistic Impact Resistance of Graphite Epoxy Composites With Shape Memory Alloy and Extended Chain Polyethylene Spectra™ Hybrid Components
… of adding small amounts of two types of high strain hybrid components on the impact resistance of graphite epoxy composites subjected to projectiles traveling at ballistic velocities (greater than 900 ft/sec) has been studied. The hybrid components tested include superelastic shape memory …
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Constitutive modeling and finite element analysis of the dynamic behavior of shape memory alloys
… response of SMAs is strongly affected by loading rate and cyclic degradation. These behaviors significantly limit the accurate modeling of SMA elements used in various devices and applications. The aim of this work is to provide engineers with a constitutive model that can accurately describe the …
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Shock wave interactions at explosive/metallic interfaces
… or copper were tested during this study of high strain rate effects within thin metal cylinders performed as an adjunct to helical flux-compression generator research at the University of Missouri-Rolla. This study directly affects the understanding of flux cut-off and high strain-rate changes in …
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Optimal Blast-Resistant Sandwich Structures with Transversely Isotropic, Elasto-plastic Polymeric Foams as Cores
… panels subject to blast loads, where high strain rates of the order of 4000 /s are observed. Unlike metallic foams polymeric foams exhibit transversely isotropic response when tested in a laboratory setting. More specifically, they exhibit different hardening along the foam thickness than …
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Nonlinear finite element analysis of reinforced concrete structures subjected to blast loading
… on the development of appropriate history and rate dependent constitutive models for concrete and steel where several material nonlinearities are considered in tension and compression as well as the strain rate effects. Computational algorithms and modified solution procedures have been also …
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Rate Effect Behaviour of Different Clays from High Speed Triaxial Element Testing
The rate effect response of three natural clays has been studied using high-speed triaxial element testing at axial strain rates up to 100,000 %/hr. Strain rate effects lead to increasing soil shear strength in fine grained soils under undrained conditions and are important for accurate predictions …
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