Transition from Small to Large Interlaminar Cracks in Fiber-Reinforced Laminated Composites
Transition from Small to Large Interlaminar Cracks in Fiber-Reinforced Laminated Composites
复制标题
纤维增强层压复合材料中从小到大层间裂纹的转变
DOI：
10.1299/jsmea.42.537
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
Keisuke Tanaka
中科院分区：
文献类型：
--
作者：
Hirohisa Kimachi;Hiroshi Tanaka;Keisuke Tanaka
用边界元法计算了纤维增强塑料（FRP）分层裂纹尖端附近的弹性应力分布。将FRP复合材料简化为由正交各向异性纤维和各向同性基体组成的二维层合结构。平行于纤维方向的直裂纹被放置在基体中，并受到模式I或II加载。计算了上述非均匀模型的应力强度因子和能量释放率随裂纹长度的变化关系，并与均匀模型的结果进行了比较。对于大裂纹，非均匀模型的能量释放率等于均匀模型获得的I型和II型载荷。对于小裂纹，非均匀模型的能量释放率大于均匀模型。对于模式I和模式II的情况，定义了从小裂纹到大裂纹的过渡条件。通过与均匀模型解的比较，讨论了非均匀模型裂纹尖端弹性基体应力分布的特点。
The boundary element method was used to determine the elastic stress distribution near the tip of a delamination crack in fiber-reinforced plastics(FRP). FRP composites were modeled by a two-dimensional laminated structure composed of isotropic matrix and orthotropic fiber. A straight crack parallel to the fiber direction is placed in the matrix and is subjected to mode I or II loading. The stress intensity factor and the energy release rate were calculated as a function of the crack length for the above inhomogeneous model, and compared with those for a homogeneous model. For large cracks, the energy release rate for the inhomogeneous model is equal to that obtained for the homogeneous model for both mode I and II loadings. For small cracks, the energy release rate is larger for the inhomogeneous model than for the homogeneous model. The transition condition from small to large cracks was defined for the cases of mode I and II. The characteristics of the elastic matrix stress distribution ahead of the crack tip for the inhomogeneous model were discussed in comparison with the solution for the homogeneous model.