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 stress concentration problem of round and flat bars with V-shaped notches under various loadings is especially important for test specimens used to investigate the fatigue strength of materials.
86 citations
TL;DR: In this article, the fracture characteristics of bovine tibia compact tension specimens associated with controlled crack propagation in the longitudinal direction have been evaluated and the fracture mechanics parameters of critical strain energy release rate and critical stress intensity factor were determined for a range of crack velocities.
Abstract: An evaluation of the fracture characteristics of bovine tibia compact tension specimens associated with controlled crack propagation in the longitudinal direction has been made. The fracture mechanics parameters of critical strain energy release rate (G
c) and critical stress intensity factor (K
c) were determined for a range of crack velocities. A comparative fracture energy (W) was also evaluated from the area under the load-deflection curve. It was found that an increase in the average crack velocity from 1.75 to 23.6×10−5 m sec−1 produced increases in G
c (from 1736 to 2796 J m−2), K
c (from 4.46 to 5.38 MN m−3/2) and W. At crack velocities >23.6×10−5 m sec−1, W decreased appreciably. Microstructural observations indicated that, for crack velocities <23.6 m sec−1, relatively rough fracture surfaces were produced by the passage of the crack around intersecting osteons (or lamellae), together with some osteon pull-out. In contrast, at a higher crack velocity, fracture was characterized by relatively smooth surfaces, as the crack moved indiscriminately through the microstructural constituents.
86 citations
TL;DR: In this article, the Hartman and Schijve equation was used to estimate the small crack behavior based on long crack data for both long and small cracks, although a different value of ΔKth was required for small cracks compared to that required for long cracks.
86 citations
TL;DR: In this paper, the microporosity and mechanism of fatigue damage formation and growth were invested using X-ray computed tomography and scanning electron microscopy, and the variations in the fracture surfaces according to three fatigue damage evolution stages: fatigue crack formation (incubation), microstructurally/physically small cracks, and long cracks.
86 citations
TL;DR: In this article, the analysis of three-dimensional crack problems using enriched crack tip elements is examined, and it is demonstrated that the enriched finite element approach is a very effective technique for obtaining stress intensity factors for general 3D crack problems.
Abstract: The analysis of three-dimensional crack problems using enriched crack tip elements is examined in this paper. It is demonstrated that the enriched finite element approach is a very effective technique for obtaining stress intensity factors for general three-dimensional crack problems. The influence of compatibility, integration, element shape function order, and mesh refinement on solution convergence is investigated to ascertain the accuracy of the numerical results. It is shown that integration order has the greatest impact on solution accuracy. Sample results are presented for semi-circular surface cracks and compared with previously obtained solutions available in the literature. Good agreement is obtained between the different numerical solutions, except in the small zone near the free surface where previously published results have often neglected the change in the stress singularity at the free surface. The enriched crack tip element appears to be particularly effective in this region, since boundary conditions can be easily imposed on the stress intensity factors to accurately represent the correct free surface condition. Copyright © 2002 John Wiley & Sons, Ltd.
86 citations