有纤维搭桥的矩形脱层屈曲

用有限元方法求解了3D复合材料中有纤维搭桥的矩形脱层屈曲问题.搭桥纤维和基体分别用分布于脱层单元节点上的只拉不压和只压不拉的线性弹簧单元来模拟，并把有纤维搭桥脱层屈曲的特征值问题转化成考虑初始缺陷的结构几何非线性强度问题，用增量非线性结构分析的有限元方法求解.结果表明，引进纤维搭桥后，脱层屈曲模态上存在与基体周期性的接触点（区），屈曲临界载荷随着纤维搭桥刚度的增加而增加.最后，通过数学公式给出了脱层屈曲的特征长度与纤维搭桥的关系式.

Buckling of Rectangular Delamination Bridged by Fibers

The problem of buckling of delamination stitched with fiber-bridge in 3D composites was solved by FEA.Linear springs of tension-only or compression-only distributed on the nodes of delamination cells are used to simulate the fibers and substrate respectively.The problem of eigenvalue buckling is transformed into the problem of geometric nonlinearities with an initial imperfection and solved by FEA of incremental non-linear structural analysis.The results show that there are period contact points(districts) ...