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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 36 for “"shear testing"”.
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Rail shear testing of composite materials: analysis and experiment
… analysis of selected graphite/polyimide rail-shear test specimens. The two-dimensional finite element analysis includes both mechanical and thermal loading (differential expansion) of the specimens and their elastic rails. Parameters in this analysis of unidirectional and symmetric angle-ply …
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Full-Scale Shake Table Cyclic Simple Shear Testing of Liquefiable Soil
… previously observed, or in tabletop laboratory testing. The study detailed herein is a controlled laboratory test performed at full scale to allow for the measurement of field-scale index testing before and after cyclic loading. Testing was performed at the Parson’s geotechnical and Earthquake …
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Experimentally validated DEM modelling of granular materials under simple shear testing
Simple shear testing’s ability in simulating realistic in situ conditions makes it an effective element-level testing method to study the response of granular materials under uni-directional and multi-directional loading. DEM modelling provides complementary information such as contact networks and …
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Experimental Techniques for Shear Testing of Thin Sheet Metals and Compression Testing at Intermediate Strain Rates
… characterization of thin sheet metals in simple shear is introduced. The objective of this work is to develop methods to generate experimental data that populate material models for numerical simulations. The new simple shear specimen, based on ASTM B831, can be tested in both quasi-static and …
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Laboratory Investigation of Shear Behaviour in Rock Joints Under Varying Boundary Conditions
… design, is through laboratory direct shear testing. Direct shear testing is typically conducted using two different boundary conditions: constant normal stress (CNL*) and constant normal stiffness (CNS). The CNL* boundary condition represents fracture behaviour in slopes and near …
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THE SYNTHESIS AND CHARACTERIZATION OF DUAL-MODIFIED CARBOXYMETHYLCELLULOSE FOR BIOADHESIVE APPLICATIONS
… strength of the material was determined by lap shear testing with porcine skin. High molecular weight and medium molecular weight methacrylated dialdehyde carboxymethylcellulose (MeDCMCHV & MeDCMCMV) were engineered and MeDCMCHV was combined with low viscosity methacrylated CMC (MeCMCLV1) to …
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A novel direct shear apparatus to evaluate internal shear strength of geosynthetic clay liners for mining applications
… applications. In particular, the internal shear strength of GCLs is an important design consideration since GCLs often are installed on sloped surfaces that induced internal shear and normal stresses. The objective of this study was to develop a direct shear testing apparatus to measure the …
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Effects of Extreme Low Temperature on Composite Materials
… materials. The work includes estimating the shear strength of carbon/epoxy and glass/polyester composites at low temperatures and finding the rate of generation of microcracks in composites at cryogenic temperatures by acoustic emission technique. Microcracks increase the permeability of …
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Measuring Liquefied Residual Strength Using Full-Scale Shake Table Cyclic Simple Shear Tests
… strength of #2/16 Monterey Sand. A simple shear testing apparatus was mounted to a full-scale one-dimensional shake table to mimic a confined layer of saturated sand subjected to strong ground motions. Testing was performed at the Parson’s Geotechnical and Earthquake Laboratory at …
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Dynamic Deformation and Mechanical Properties of Brain Tissue
… an experimental procedure combining both shear testing and indentation was developed and applied to white matter and gray matter. These measurements of brain-skull interactions and mechanical properties of the brain will be valuable in the development and validation of finite element …
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Characterization and Response of Thermoplastic Composites and Constituents
… of strain rate, as well as the through-thickness shear behavior of composite laminates. Obtaining fiber properties proved to be a challenge. The high strength and low surface energy of the fibers makes gripping specimens difficult. Several different methods of fixturing and gripping are …
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New in-plane and interlaminar shear test methods for fiber reinforced composites
… new compact double-notched specimen for in-plane shear testing of isotropic, anisotropic and composite materials was developed. A preliminary test of the specimen was performed on a cross-ply laminate. High sensitivity moire interferometry was used to determine the shear and normal strains on the …
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Comparative Assessment of Single & Double Interface Shear Strength Properties: A Case Study of a Landfill Project in the Western Cape Province, South Africa
… presented several new potential interfaces for shear failure, particularly on side-slopes and basins of conventional hole-in-ground type MSW landfills. In the laboratory, interface shear strength properties of either soil-geosynthetic or geosynthetic-geosynthetic are determined through a single …
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Numerical study of solder joint failure under fast loading conditions
… The finite element model assumes a lap-shear testing configuration, where the solder joint is bonded to two copper substrates. A progressive ductile damage model was incorporated into the rate-dependent constitutive response of the Sn (tin)-Ag (silver)-Cu (copper) solder alloy, resulting …
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Diagonal Tension Testing of Interlocking Compressed Earth Block Panels
… thesis examines the use of diagonal tension (shear) testing to determine factors affecting shear strength of Interlocking Compressed Earth Block (ICEB) panels. This work expands on the current information available about strength properties of ICEB assemblies, which are dry-stacked, as opposed …
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On the shear strength of polyurethane coated railroad ballast
… As part of this thesis study research, direct shear testing was undertaken for two di erent railroad ballast aggregates, granite and limestone. Both aggregate materials satis ed the AREMA No. 24 railroad ballast gradation requirements. Although the unbound granite samples showed higher shear …
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Finite element analysis of embankment on soft Indian River clay
… of 1 -D consolidation and triaxial laboratory shear testing on clay samples. Plane strain numerical analyses were carried out using PLAXIS 2D AETM using the Modified Cam-Clay and MIT-E3 effective stress models to represent clay behaviour. The numerical predictions are generally in very …
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Modeling the High Strain Rate Tensile Response and Shear Failure of Thermoplastic Composites
… with strain rate. However, physical testing of these composites is difficult at strain rates above 10^-1/s. A Monte Carlo simulation of composite tensile strength is constructed to estimate the tensile behavior of these composites. Load redistribution in the vicinity of fiber breaks …
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Slope Stability of the Hunter Creek Formation: A Geotechnical Investigation Near Mogul, Nevada
… and sample collection for laboratory testing. A monument was placed in an active failing mass to track movement over the spring of 2012 annual snow-melt. Laboratory testing included particle size distribution, specific gravity, Atterberg limits, and direct shear testing. An engineering …
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Bonding Properties of Newly Erupted and Mature Human Premolars
… Brackets were debonded using an Instron testing machine in shear-testing mode. There were no statistically significant differences in the bond strengths between the self-etching primer and conventional etching groups. ARI scores showed differences between mature and newly erupted teeth. …
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