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, a linear elastic analysis of a single broken fiber surrounded by six equally spaced fibres is performed, and the analysis shows that the stress concentration in the adjacent fiber is 1·058, much lower than the value of 1·104 predicted by Hedgepeth and van Dyke (J. Comp. Mater., 1 (1967) 294-309).
127 citations
TL;DR: The preliminary results indicate that large von Mises stress occurs where plantar soft-tissue contacts with geometrically irregular bony structures, thus internal stress distribution within the plantarSoft-Tissue was dramatically influenced by bony prominences due to stress concentration.
127 citations
TL;DR: In this article, a gradient dependent multiaxial high-cycle fatigue criterion function of the stress invariants is formulated based on these observations, and the results showed that although the fatigue endurance is strongly affected by the gradient of the normal stress in bending tests, it remains insensitive to variations of the shear stress in torsion tests.
127 citations
TL;DR: In this paper, the authors proposed a new concept with a new interface model for carbon black reinforcement of elastomer, based on stress analysis, which consists of double uncrosslinked polymer layers of different molecular mobility, the inner glassy hard (GH) layer, and the outer sticky hard (SH) layer surrounding a carbon particle.
Abstract: The author proposes a new concept with a new interface model for carbon black reinforcement of elastomer, based on stress analysis. The new model consists of double uncrosslinked polymer layers of different molecular mobility, the inner glassy hard (GH) layer, and the outer sticky hard (SH) layer surrounding a carbon particle. In this report, the most essential and fundamental three subjects in the carbon black reinforcement are discussed. Large stress increase with filler content and increasing strain amplitude results from the strong stress concentration generated around carbon particles and its transmission to the whole system. The great increase in tensile stress is only possible when the stress-hardened superstructure produced in the SH layer under large extension supports the large stress concentration. The super structure is the network of carbon particles interconnected by strands of oriented and extended molecules, together with a craze-like phenomenon forming numerous microvoids. Stress softening, called the Mullins effect, mainly results from the buckling of the strand of oriented molecules. Thus, the large and instant stress reduction takes place in unloading, in which the main load-bearing force is the entropic, contractile force of matrix crosslinked rubber. During long periods, the extended molecules in the uncrosslinked SH layer will considerably relax and return to their original entropic state.
127 citations
TL;DR: In this article, a two-phase composite mesoscopic model for nanocrystalline deformation that includes the effects of both dislocation emission and dislocation absorption mechanisms is used to evaluate the primary interface dislocation sources and estimate both the free enthalpy of activation and the critical emission stress associated with the interfacial dislocation emissions mechanism.
Abstract: Molecular dynamics simulations are used to evaluate the primary interface dislocation sources and to estimate both the free enthalpy of activation and the critical emission stress associated with the interfacial dislocation emission mechanism. Simulations are performed on copper to study tensile failure of a planar Σ5 {2 1 0} 53.1° interface and an interface with the same misorientation that contains a ledge. Simulations reveal that grain boundary ledges are more favorable as dislocation sources than planar regions of the interface and that their role is not limited to that of simple dislocation donors. The parameters extracted from the simulations are utilized in a two-phase composite mesoscopic model for nanocrystalline deformation that includes the effects of both dislocation emission and dislocation absorption mechanisms. A self-consistent approach based on the Eshelby solution for grains as ellipsoidal inclusions is augmented by introduction of stress concentration in the constitutive law of the matrix phase to account for more realistic grain boundary effects. Model simulations suggest that stress concentration is required in the standard continuum theory to activate the coupled grain boundary dislocation emission and absorption mechanisms when activation energy of the dislocation source is determined from atomistic calculation on grain boundaries without consideration of impurities or other extrinsic defects.
127 citations