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Hydrostatic stress
About: Hydrostatic stress is a research topic. Over the lifetime, 1568 publications have been published within this topic receiving 37773 citations.
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TL;DR: In this article, the effect of hydrostatic stress on the sensitivity of nonlinear optical waveguide sensors was investigated and it was found that the value of the hydrostatic stresses can affect the values of the stress sensitivity of the waveguide sensor and present anisotropic behavior to the system.
Abstract: Sensitivity of optical parameters is a significant topic in developing optoelectronic devices. The stress sensitivity of nonlinear optical waveguides is closely related to hydrostatic stress. The hydrostatic stress can cause anisotropic and inhomogeneous distribution of the refractive index. In this paper analytical and numerical calculations are performed to study the effect of hydrostatic stress on the sensitivity of nonlinear optical waveguide sensors. The optical performance of the waveguide sensors under various hydrostatic stress states is also investigated. Transverse magnetic modes (TM) are considered in addition to transverse electric modes (TE) to study anisotropy. It is found that the value of the hydrostatic stress can change the value of the cutoff thickness. These changes may induce multimode. Moreover, the hydrostatic stresses influence the values of the stress sensitivity of the waveguide sensors and present anisotropic behavior to the system.
7 citations
TL;DR: In this article, the bulk deformation of three-dimensional Cu46Zr54 metallic glass (MG) and Cu single crystal model systems using molecular dynamics simulation was performed. And the results indicated that hydrostatic stress can incur shear stress in MG, but not in crystal.
Abstract: Shear deformation can induce normal stress or hydrostatic stress in metallic glasses [ Nature Mater. 2 ( 2003) 449, Intermetallics 14 ( 2006) 1033]. We perform the bulk deformation of three-dimensional Cu46Zr54 metallic glass (MG) and Cu single crystal model systems using molecular dynamics simulation. The results indicate that hydrostatic stress can incur shear stress in MG, but not in crystal. The resultant pronounced asymmetry between tension and compression originates from this inherent shear-dilatation coexistence in MG.
6 citations
TL;DR: In this article, a study of the microstructure and state of residual stress in a layered material made of homogeneous layers of alumina and alumina-zirconia separated by thin intermediate compositionally graded layers is presented.
Abstract: In order to understand the mechanical behavior of layered composites with compositional gradient, it is necessary to determine their state of residual stresses. Compositionally graded materials can offer the advantage of eliminating abrupt changes in composition between layers having different thermal expansion coefficient. The existence of a compositional gradient can reduce discontinuities in thermal residual stresses, something beneficial from the point of view of the mechanical properties. We present here a study of the microstructure and state of residual stressses in a layered material made of homogeneous layers of alumina and alumina–zirconia separated by thin (less than 300 μm) intermediate compositionally graded layers. The composite was obtained by controlled deposition of powders from solution using an electrophoretic deposition (EPD) method. The phase distribution and compositional gradient in the sintered composite were investigated using scanning electron microscopy (SEM). Thermal residual stresses generated during cooling after sintering were measured by using fluorescence ruby luminiscence piezo-spectroscopy and the profile of hydrostatic stress on alumina was determined at steps of about 300 μm along the direction of the compositional gradient, and at steps of about 30 μm in the compositionally graded layers. The obtained profile of hydrostatic stresses on alumina grains follows closely the profile of compositional changes along the layered composite. The presence of thin intermediate graded layers reduce significantly changes in stress in the layered composite.
6 citations
TL;DR: In this article, the Weibull statistical theory could not provide a good description on the data, but underestimated the effect of hydrostatic stress on the increase of the fracture strength, which could be explained by assuming that subcritical crack growth enhanced at the same surface flaws in the specimen tested at atmospheric pressure was restricted under hydrostatic pressure.
Abstract: Triaxial stress tests of soda-lime glass were carried out by four-point bending of plates under hydrostatic pressure and by concentric-ring loading of disks under hydrostatic pressure. The triaxial data for fracture stresses plotted in principal stress space were compared with the theoretical fracture predictions. The Weibull statistical theory could not provide a good description on the data, but underestimated the effect of hydrostatic stress on the increase of the fracture strength. The deviation of the experimental data from the Weibull statistical prediction could be explained by assuming that subcritical crack growth enhanced at the same surface flaws in the specimen tested at atmospheric pressure was restricted under hydrostatic pressure.
6 citations
TL;DR: In this paper, it is shown that the work material deforms with constant flow stress with the consequence that the hydrostatic stress on the shear plane is a constant, and the use of a constant friction angle, λ, to relate shear stress to normal stress at all points along the rake face.
6 citations