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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 23 for “"biaxial stress"”.
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Fatigue limit analysis involving biaxial stress components
Biaxial stress fatigue data is carefully examined in order to determine how much foundation exists for a rational approach to classical stress-based fatigue limit analysis involving biaxial stress components. A review is given of the methods presently in vogue, and new methods are suggested for …
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Tests and analysis relating to the strength and elasticity of concrete and reinforced concrete under biaxial stress
Made available in DSpace on 2016-11-09T23:47:22Z (GMT). No. of bitstreams: 2 5994699.pdf: 19675892 bytes, checksum: 828ebbff7a7f23cd6c1f78b0508bc4a2 (MD5) license.txt: 4183 bytes, checksum: 1dcc2037833d76bede73d5717587543b (MD5) Previous issue date: 1916
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The Effect of Biaxial Stress on The Strength and Flow Characteristics of Copper and Welded Copper Joints
Made available in DSpace on 2015-05-12T17:06:14Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 0004485.PDF: 7525715 bytes, checksum: 31728d0a00db9d4298ed48a12143f4e2 (MD5) Previous issue date: 1952
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Thermodynamics of Polyamide Separation Membrane in Contact With Aqueous Solutions
… of measurements of water mass uptake and biaxial stress as a function of relative humidity. Water solubility in polyamide active layer is 12 wt% at a relative humidity of 95%. The slope of a water concentration versus humidity curve can be used to calculate inter-diffusivity of water in …
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Neural network-based material modeling
… With this material modeling methodology, the stress-strain behavior of a material is captured within the distributed weight structure of a multilayer feedforward neural network trained directly on the stress-strain data obtained from experiments. The feasibility of this approach is verified …
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Raman Scattering in GaN and ZnO
… of positions of the E2H and A1(LO) phonon modes, biaxial stress and plasmon coupling of the Al(LO) mode are observed and compared to a bulk GaN sample. The stress-related shift rate for the AI(LO) mode in hexagonal GaN is established to be 2.7 ± 0.4 cm-1/GPa through series of GaN with low free …
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Measuring Material Properties of Proton Exchange Membranes using Pressure Loaded Blister Testing and Digital Image Correlation
… analysis tool useful for measuring the biaxial strength of membranes. In this work, blister tests are used to measure biaxial stress and strain for fuel cell membranes subjected to ramped pressure loading to form stress-strain curves that indicate the onset of yielding under biaxial …
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Dislocation Modeling of Mechanical Properties of Nanolayered Composite Materials
… determined approximately by the critical applied stress to eliminate thecompressive biaxial stress in alternating layers of the composite. Yield strength maps areconstructed for nanoscale multilayered composites consisting of alternating layer phasesin which the volume fraction of the phases, …
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CONSTRAINT-BASED FAILURE ASSESSMENT OF COPLANAR CRACKS IN PLATES AND PIPES UNDER TENSION
… effect increases with increasing load level, biaxial stress and material hardening exponent. Using crack driving force of coplanar cracks could not account for this constraining effect hence underestimates the stresses near the coplanar crack fronts. A crack interaction factor is proposed by …
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Design of a hydraulic bulge test apparatus
The various equi-biaxial tension tests for sheet metal were studied and compared to determine the most appropriate equipping in the Impact and Crashworthiness Laboratory, MIT, for the testing of Advanced High Strength Steel. The hydraulic bulge test was identified as the most economical solution. …
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ON DEFORMATION STABILITY AND DUCTILE DAMAGE IN NANOTWINNED METALS
… grained model for probing the size-dependent stress-strain responses and microstructural instabilities in polycrystalline NT materials, without explicitly modeling twins. Finally, we investigate the role of twinning mediated microstructure evolution on the damage in NT materials due to the …
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Failure strength and mechanism of composite laminates under multiaxial loading conditions
… reinforced composite laminates in an in-plane stress state has been conducted. Different types of biaxial specimens and associated test fixtures were developed and employed in the study. Standard IITRI specimens were used to determine tensile and compressive failure strengths of G-10 composite …
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Rock fracture under static stress conditions
… of rock fracture, particularly under compressive stress conditions, is of fundamental importance. This thesis contains details of an investigation into the applicability of Griffith's brittle fracture theory, modified to account for the effects of crack closure in compression, to the prediction of …
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Ultrafast Laser Micromachining for Correction of Thin Optics for Next Generation X-ray Space Telescopes
… ultrafast laser micromachining technology with stress-based figure correction technique to correct for figure errors and coating distortions in thin mirrors. Rapid developments of ultrafast laser technologies have enabled high accuracy laser material processing and structuring on micron scales. …
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Design of an active compressor blade for aeroelastic studies
… with these design parameters to calculate the stresses in the composite spars, the level of tip rotation available from piezoelectric actuation, and the strains seen by the piezoceramic under full centrifugal loads. The spar stresses and available actuation were within required ranges, but the …
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Piezoelectric effects in GaAs MESFET's
… techniques and possesses high intrinsic stress. The stresses arise from the difference in the gallium arsenide and silicon nitride material properties, such as coefficient of expansion, density, modulus, and deposition temperature. The stress has been shown to cause electrical performance …
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Accelerated viscoelastic characterization of T300/5208 graphite- epoxy laminates
… uniaxial load using discrete steps in stress. The viscoelastic response of T300/5208 graphite-epoxy at 149C to transverse normal and shear stresses is determined using 90-deg and 10-deg off-axis tensile specimens, respectively. parameters In each case the seven viscoelastic material …
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Thermodynamics and kinetics of ion-exchange in perchlorate-selective poly(vinylbenzyltrialkylammonium chloride) matrices
… to perchlorate form. Mass uptake and mechanical stress in the films are investigated using a quartz crystal microbalance and a scanning optical laser apparatus, respectively. Water absorption in these films is strongly correlated to both the amine modifier and counterion present in the matrix. …
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Influence Of Cholesterol And Bilayer Asymmetry On Membrane Protein Distribution In Polymer-Tethered Raft-Mimicking Lipid Membranes
… impact membrane elastic properties and lateral stress within the bilayer. Previously it has been shown that phospholipid monolayers with elevated concentration of lipopolymers are able to respond to increasing lateral stress by inducing membrane buckling, a stress relaxation phenomena. As part …
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Scale-model investigation of brittle tunnel failure using a true-triaxial device
… tunneling simulations, capturing unloading stress paths and face support behavior. Damage progression observation and post-mortem investigation provide detailed identification of damage mechanisms around the tunnel boundary, such as surficial spalling and damage zone development, as a …
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