复合材料压缩破坏模式的缺陷敏感性

DEFECT SENSITIVITY OF COMPRESSIVE FAILURE MODES IN FIBRE REINFORCED COMPOSITES

本文基于弹塑性分叉理论研究单向纤维增强复合材料的压缩破坏模式和压缩强度对缺陷的敏感性问题。对于常见复合材料,所得结论是:无缺陷或者小缺陷情况的破坏模式为倾斜破坏带;大缺陷情况的破坏模式为水平破坏带;形成水平破坏带的压力值小于形成倾斜破坏带的压力。

Defect sensitivity of the compressive failure modes,as well as the related compressive strength,of fibre reinforced composites is explored herein by means of the elastic plastic bifurcation theory. It is concluded for the conventional composites reinforced by unidirectional fibres that;failure mode featured by inclined kink bands would prevail if the initial defects inside the composites are small ;on the other hand,failure mode of horizontal bands would be energetically favorable provided the initial damage is substantial,and the resultant critical pressure load for the formation of horizontal band is less than that for in clined band under small initial defect.