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 impact behavior of silver-powder-filled isotactic polypropylene composites was investigated in the composite composition range of 0-5.6 vol% of Ag.
Abstract: Mechanical properties, such as tensile and flexural properties, as well as impact behavior of silver-powder-filled isotactic polypropylene composites were investigated in the composite composition range of 0–5.6 vol% of Ag. Tensile modulus, strength, and elongation at break decreased with incorporation of silver and an increase in silver concentration. Analysis of tensile strength data indicated the introduction of stress concentration and discontinuity in the structure upon addition of Ag particles. Izod impact strength decreased sharply on addition of 0.43 vol % of Ag particles, beyond which the value decreased marginally. Both flexural modulus and strength increased with filler content due to an increase in rigidity. Surface treatment of filler marginally improved mechanical properties. © 1996 John Wiley & Sons, Inc.
155 citations
TL;DR: In this paper, the authors investigated the influence of mean stress, specimen thickness, flow stress, and fracture toughness on the growth rate of fatigue crack propagation through their effect on growth mechanism and showed that simple relationships between the rate of propagation and alternating stress intensity are adequate for describing fatigue crack growth.
155 citations
TL;DR: A fixed-grip fracture mechanics microspecimen was developed but could find no evidence of static stress corrosion cracking in polysilicon, and the environmental sensitivity of the fatigue resistance was investigated under cyclic loading.
Abstract: In the absence of a corrosive environment, brittle materials such as silicon should be immune to cyclic fatigue However, fatigue effects are well known in micrometer-sized polycrystalline silicon (polysilicon) samples tested in air To investigate the origins of this phenomenon in polysilicon, we developed a fixed-grip fracture mechanics microspecimen but could find no evidence of static stress corrosion cracking The environmental sensitivity of the fatigue resistance was also investigated under cyclic loading For low-cycle fatigue, the behavior is independent of the ambient conditions, whether air or vacuum, but is strongly influenced by the ratio of compressive to tensile stresses experienced during each cycle The fatigue damage most likely originates from contact stresses at processing-related surface asperities; subcritical crack growth then ensues during further cyclic loading The lower far-field stresses involved in high-cycle fatigue induce reduced levels of fatigue damage Under these conditions, a corrosive ambient such as laboratory air exacerbates the fatigue process Without cyclic loading, polysilicon does not undergo stress corrosion cracking
155 citations
TL;DR: Compared the stress distribution in shear and micro-shear test set-ups using finite element analysis, and suggesting some parameter standardization that might have important influence on the results are aimed at.
154 citations
TL;DR: In this article, fatigue crack growth in an elastic-perfectly plastic solid is modelled using a two-dimensional finite element analysis, where plane deformations are enforced and crack advance is simulated by node release.
154 citations