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 paper, the effect of grain boundary inclination with respect to the loading direction on void nucleation at a boundary, using plate impact experiments on polycrystalline copper, was investigated.
81 citations
TL;DR: In this article, the authors considered the influence of the transient nature of the crack growth process on the stress field in the immediate vicinity of a crack tip during nonsteady growth.
Abstract: T he process of dynamic crack growth in a nominally elastic malerial under conditions of plane strain or plane stress is considered. Of particular concern is the influence of the transient nature of the process on the stress field in the immediate vicinity of the crack tip during nonsteady growth. Asymptotically, the crack tip stress field is square root singular at the crack tip, with the angular variation of the singular field depending weakly on the instantaneous crack tip speed and with the instantaneous stress intensity factor being a scalar multiplier of the singular field. However, for a material particle at a small distance from the moving crack, the local stress field depends not only on instantaneous values of crack speed and stress intensity factor, but also on the past history of these lime-dependent quantities. A representation of the crack tip field is obtained in the form of an expansion about the crack up in powers of radial coordinate, with the coefficients depending on the time rates of change of crack tip speed and stress intensity factor. This representation is used to interpret some experimental observations, with the conclusion that the higher-order expansion provides an accurate description of crack tip fields under fairly severe transient conditions. In addition, some estimates are made of the practical limits of using a stress intensity factor field alone to characterize the local fields.
81 citations
TL;DR: In this paper, the authors investigated the propagation of fatigue cracks in notched and unnotched biaxially stressed plates and found that the rate of propagation is affected by both the stress field associated with the notch and the biaXial stress state of the bulk material.
Abstract: The propagation of fatigue cracks in notched and un-notched biaxially stressed plates is investigated. The rate of propagation is found to be affected by both the stress field associated with the notch and the biaxial stress state of the bulk material. It is found that the propagation rate of a crack from a notch may be predicted by the use of a theoretical notch contribution factor in conjunction with propagation data for a crack in un-notched material.
81 citations
TL;DR: In this article, a numerical algorithm to help understand the three-dimensional and complex stress distribution in the random porous microstructure is proposed, and an original histogram display of the stress distribution is shown to evaluate the stress concentration in the porous materials.
80 citations
TL;DR: In this paper, the authors show that the bending stress can be reduced significantly by using asymmetric gear teeth and by shape optimizing the gear through changes made to the tool geometry, but the stress reductions found are not very sensitive to small design changes.
80 citations