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Showing 1 to 20 of 22 for “"biaxial loading"”.
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Fatigue Damage and Small Crack Growth During Biaxial Loading
The progressive nature of fatigue damage under biaxial loading has been investigated. Experiments were performed on thin-wall tubular specimens of 1045 steel in tension, torsion, and combined tension-torsion loading. Two equivalent strain amplitudes, one in the high cycle fatigue (HCF) region and …
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Combined tensile-compressive biaxial loading of Li-ion battery components
Lithium-ion batteries under a mechanical load can develop failures in the internal multi-layer structure. Due to the flammable materials required for construction, the safety of the battery has been in question since it was first developed. Internal failures can create a short circuit which may …
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Anisotropy of Passive and Active Rat Vagina under Biaxial Loading
… behavior of the vagina, we performed planar biaxial tests of vaginal specimens in both the passive (relaxed) and active (contracted) states. Specimens were isolated from virgin, female Long-Evans rats (n=16) and simultaneously stretched along the longitudinal direction (LD) and …
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Tearing of Vaginal Tissue under Biaxial Loading: Implications for Women's Health
… swine and rat vaginal tissue is subjected to biaxial loads until tearing to reveal its mechanical properties. The resulting large inhomogeneous deformations are measured by the digital image correlation optical method to calculate material strain. The influence of these strains near to and far …
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Behaviour of steel fibre reinforced high performance concrete under biaxial loading conditions
… high performance concrete (SFRHPC) under biaxial loading conditions. Also included are constitutive models to enable numerical predictions of the strength behaviour of such a material. Within the experimental stage a large biaxial test machine was designed and manufactured. The load …
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Damage tolerance of pressurized graphite/epoxy tape cylinders under uniaxial and biaxial loading
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1994.
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Quantification of the Elastic and Relaxation Properties of Human Tunica Albuginea under Biaxial Loading
… tunica tissue (n=5) from donors were tested biaxially along the circumferential and longitudinal directions to a specified load magnitude and maintained at a fixed displacement for 30 minutes to allow for stress relaxation. The loading and relaxation were then repeated for a second time. …
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Quantifying the Constraint Effect of Three-Dimensional Specimens with Biaxial Loading Using the J-A2 Method
… as the configuration and level of the applied loading. This dependence is referred to as the constraint effect in fracture. The two parameter J-A2 method is investigated to determine if it can be used to quantify the constraint effect and predict failure of mechanical components. The J-A2 …
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Biomechanics of the human chorioamnion
… from seven patients under different uniaxial and biaxial loading conditions. Significant relaxation was noted under uniaxial loading while very limited creep was observed under biaxial loading. Biochemical measurements such as collagen and sulfated glycosaminoglycan contents were also obtained. In …
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In situ diffraction investigations of mechanisms that lead to path dependent mechanical behaviours of nickel-titanium shape memory alloys
… variables (ISVs) like volume fraction under biaxial loading conditions.The first part of the thesis examines the role of loading history on reorientation mechanics of martensitic NiTi. Deformation under mechanical loads of two sets of specimens with different initial microstructure were …
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Correlation of localised thermal shock to isothermal biaxial crack growth rates in thin plates of AISI 316 stainless steel.
… centre-cracked plates loaded under isothermal biaxial conditions are modelled. Crack growth rates are then applied to the models to determine a correlation between the two geometries. The work presented demonstrates that a correlation exists between thermal downshock and biaxial isothermal …
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Mechanical behavior of shell casing and separator of lithium-ion battery
… and fracture resistance under mechanical loading, and the failure of the separator determines onset of internal short circuit of the cell. In the first part of this thesis, a plasticity and fracture model of the battery shell casing by taking the anisotropic plasticity and stress-state …
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Prediction of crack extension direction in unidirectional composites
… To achieve this, the effect of anisotropy and biaxial loading on the direction of crack growth in unidirectional off-axis composite materials were investigated. Specific emphasis was placed on defining the crack tip stress field and finding a consistent criterion for predicting the direction of …
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Strength of non-persistent rock joints
… persistent and non-persistent rock joints under biaxial loading. Previous investigations concerning the behavior of rock masses were conducted by simulating the rock mass as an assemblage of unit blocks. This arrangement is susceptible to rotation, imperfect contacts, and surface mismatch of the …
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Biaxial Response of Individual Bonds in Thermomechanically Bonded Nonwoven Fabrics
… formed by melted and fused fibers. Through equi-biaxial tensile testing and simultaneous image capture, the mechanical response of individual bonds was studied through loading in the preferential fiber direction, the machine direction, and in the direction that is perpendicular, the cross …
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The Design and Construction of a Bulge Testing Device Platform for Human Skin Tissue Applications
… available for anisotropic human skin tissue in biaxial loading configurations to suitably represent skin in vivo. Inconsistencies in mechanical and physical properties in the literature due to numerous physiological factors have restricted development of biaxial testing equipment in laboratories …
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Thermo-mechanical response and plastic deformation behavior of Hastelloy X at elevated temperatures — role of dynamic strain aging
… of Hastelloy X subjected to thermo-mechanical loading is investigated, and the phenomenon of dynamic strain aging is studied under isothermal and temperature jump experiments, using the technique of digital image correlation (DIC). The material of interest, a Ni-based superalloy, is widely used …
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MATERIAL PROPERTIES OF AORTA FROM BIAXIAL OSCILLATORY TESTS
… relationship of aorta in dynamic oscillatory biaxial loading. A setup was developed that supplied pressure loading from the physiological to sub-failure levels (between 7 and 76 kPa) to porcine aorta at frequencies ranging from 0.50Hz to 5.00Hz. Samples tested were constrained at both ends …
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Fracture analysis in biomimetic Bouligand architectures
… impact, quasi-static uniaxial, and quasi-static biaxial loading. The results show that the biomimetic helicoidal composite has remarkable damage resistance under all loading conditions. These findings provide a better understanding of the Bouligand structure which would be initial guidelines to …
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Performance of C-Shaped structural concrete walls subjected to bi-directional loading
… of non-planar geometry and multi-directional loading. To improve the understanding of the three-dimensional and asymmetric response of coupled core walls, an experimental testing program of C-shaped walls subjected to uni-directional and bi-directional cyclic loading was completed. Three …
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