共查询到1条相似文献,搜索用时 15 毫秒
1.
Hong Gun Kim 《Journal of Mechanical Science and Technology》1998,12(2):257-266
In discontinuous composites, the fiber end effects can be neglected when the length of fiber is much greater compared to the
diameter. Thus, conventional shear lag theory is very useful for predicting composite properties deduced from each constituent.
However, in the case of short fiber or whisker reinforced composites, the end effects cannot be neglected, and the composite
properties are functions of material and geometrical parameters since the fiber end effects significantly influence the behavior
of composites. For a good understanding of the behavior of short fiber or whisker reinforced composites, it is necessary to
first understand the mechanism of stress transfer and it has well been modified before. However, the modification was limited
to the basic elastic stress calculation of the fiber and matrix in a micromechanical model. Accordingly, the former modification
of the shear lag model has been extended to predict the overall elastic composite behavior and elastic-plastic behavior of
which result can predict the stress concentration in the matrix as well as the onset of matrix yielding. The extended modification
results showed that it gives a good agreement with finite element analysis as well as with experimental data. It was also
found that the local matrix yielding is initiated in the vincinity of the fiber ends which produces local plasticity and an
elastic-elastic transition before the composite stress reaches matrix yield stress. 相似文献