Showing papers by "Hamid Garmestani published in 1995"
TL;DR: In this paper, the authors used the BKD method to investigate the predicted stress gradients, induced near the fiber-matrix interfaces during the processing of metal matrix composites.
Abstract: We have used the BKD method to investigate the predicted stress gradients, induced near the fiber-matrix interfaces during the processing of metal matrix composites. The BKD patterns in a composite specimen have to be acquired with great consistency before the images can be analyzed for quantitative information on dislocation densities and hence plastic strain. We have developed a suitable image acquisition and analysis procedure for this purpose. The developed methodology has been applied to evaluate the plastic strain gradients in an Al-W composite subjected to a cooling cycle. We have compared the BKD results to FEM analysis which takes into account the temperature dependent material properties and actual spatial distribution of fibers. The results reveal the presence of sharp gradients of plastic strain near the interfaces.
11 citations
TL;DR: In this paper, an elastoplastic analysis of an axisymmetric cylinder subjected to linear body forces is presented, where the effect of reinforcement and anisotropy are also included.
Abstract: An elastoplastic analysis of an axisymmetric cylinder subjected to linear body forces is presented. The effect of reinforcement and anisotropy are also included. Classical plasticity and familiar assumptions of plane stress and strain are used to arrive at closed-form solutions for the case of linear body forces. The problem is solved for the general case in which orthotropy is considered in the elastic range. For the case of plasticity, first the isotropic yield functions (von Mises and Tresca) are used and then the problem is extended to the case of Hill's yield criterion. Closed-form solutions are found for both the von Mises (plane strain) and Tresca (plane stress and strain) cases.
2 citations