Topic
Stress concentration
About: Stress concentration is a research topic. Over the lifetime, 23250 publications have been published within this topic receiving 422911 citations.
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TL;DR: In this article, the authors investigated the effect of cleavage stress and peel stress on YBCO-coated conductor coils and showed that the effect is mostly negligible for paraffin impregnated Y-BCO and dry wound conductor coils, and that the cleavage strength for a slit edge is 2.5 times lower than that for the original edge of the conductor.
Abstract: Cleavage strength for an YBCO-coated conductor at 77 K was investigated with a model experiment. The nominal cleavage strength for an YBCO-coated conductor is extremely low, typically 0.5 MPa. This low nominal cleavage strength is due to stress concentration on a small part of the YBCO-coated conductor in cleavage fracture. Debonding by the cleavage stress occurs at the interface between the buffer layer and the Hastelloy substrate. The nominal cleavage strength for a slit edge of the conductor is 2.5-times lower than that for the original edge of the conductor; cracks and micro-peel existing over the slit edge reduce the cleavage strength for the slit edge. Cleavage stress and peel stress should be avoided in coil winding, as they easily delaminate the YBCO-coated conductor, resulting in substantial degradation of coil performance. These problems are especially important for epoxy impregnated YBCO-coated conductor coils. It appears that effect of cleavage stress and peel stress are mostly negligible for paraffin impregnated YBCO-coated conductor coils or dry wound YBCO-coated conductor coils.
144 citations
TL;DR: In this article, a three-dimensional residual stress mapping of an aluminum 2024-T3 arcan specimen, butt-welded by the friction stir technique, was performed by neutron diffraction results indicate that the residual stress distribution profiles across the weld region are asymmetric with respect to the weld centerline.
Abstract: Three-dimensional residual stress mapping of an aluminum 2024-T3 arcan specimen, butt-welded by the friction stir technique, was performed by neutron diffraction Results indicate that the residual stress distribution profiles across the weld region are asymmetric with respect to the weld centerline, with the largest gradients in the measured residual stress components occurring on the advancing side of the weld, with the longitudinal stress, σ L , oriented along the weld line, as the largest stress Within the region inside the shoulder diameter, the through-thickness stress, σ Z , is entirely compressive, with large gradients occurring along the transverse direction just beyond the shoulder region In addition, results indicate a significant reduction in the observed residual stresses for a transverse section that was somewhat closer to the free edge of an Arcan specimen Microstructural studies indicate that the grain size in the weld nugget, is approximately 64 microns, with the maximum extent of the recrystallized zone extending to 6 mm on each side of the weld centerline Outside of this region, the plate material has an unrecrystallized grain structure that consists of pancake shaped grains ranging up to several mm in size in two dimensions and 10 microns in through-thickness dimension
144 citations
TL;DR: In this paper, mechanical properties of silica-filled epoxy resin are tested and it is shown that at elevated temperatures, the material's properties vary immonotonically with filler volume fraction.
143 citations
TL;DR: In this article, the effect of shot peening on the reverse bending fatigue behavior of Al-7075-T651 was investigated by means of X-ray diffraction (XRD) measurements.
143 citations
TL;DR: In this article, the variations of the amplitude of the stress field, the triaxiality of stress and the crack tip opening displacement against the Triaxial stress constraint T = are analyzed in detail based on the work of Part I and Part II of this study.
142 citations