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Stress relaxation
About: Stress relaxation is a research topic. Over the lifetime, 12959 publications have been published within this topic receiving 270815 citations.
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TL;DR: Stress relaxation experiments were performed on two grades of polycarbonate at room temperature as discussed by the authors, and the volume change measurements in tension show initial dilatation of the samples followed by a volume relaxation that at the largest strains in one grade of poly carbonate leads to densities greater than those of the other.
Abstract: Stress relaxation experiments were performed on two grades of polycarbonate at room temperature The tests were performed in uniaxial extension and compression at deformations from the small strain, linear viscoelastic regime to the highly nonlinear viscoelastic regime just below yield Simultaneous to the control of axial strain, both stress and lateral strain were measured, the latter providing the volume change for the samples The volume change measurements in tension show initial dilatation of the samples followed by a volume relaxation that at the largest strains in one grade of polycarbonate leads to densities greater than those of the undeformed sample In the case of the compression measurements, the volume decreases upon deformation, but, rather than relaxing back towards the undeformed volume, the samples continuously densify The differences in the tensile dilatation for the two grades of polycarbonate suggest that the volume behavior may be related to the propensity to yield vs fracture
72 citations
TL;DR: In this article, the back stress induced in a twin by the surrounding matrix is analyzed using a simple two-dimensional finite element model of an elastic elliptical inclusion in a plastic medium, and the influence of the ellipse aspect ratio, the matrix yield stress and the external loading on the internal shear stress are investigated.
72 citations
72 citations
IBM1
TL;DR: In this paper, the authors investigated the strain and strain-relaxation in (111) oriented Pb films deposited onto oxidized Si substrates at 300 K and then cooled down to temperatures as low as 4.2 K.
72 citations
TL;DR: In this article, a new method for estimating stress magnitudes as a function of depth in sedimentary formations based on a laboratory constrained viscous rheology and steady tectonic loading is proposed.
72 citations