筋条部分开裂复合材料加筋板后屈曲性态的有限元分析

FEM Analysis of Post-buckling Property of Composite Stiffened Panel

采用参考面单元技术并引入虚拟杆单元,建立筋条局部脱胶开裂复合材料梁/板结构后屈曲分析的有限元简化模型。着重研究不同开裂尺寸和位SLM置对复合材料层合加筋板后屈曲承载能力的影响。计算表明:开裂位置相同,开裂尺寸增加会导致后屈曲承载能力降低;开裂尺寸相同,随着其位置由筋条中心向端部移动,加筋板的后屈曲承载能力逐渐上升;值得注意的是,筋条端部开裂使加筋板的后屈曲承载能力显著降低,其影响远大于筋条中心位置开裂。

The FEM （ finite element model） of post - buckling analysis of composite beam/plate structure with crack between stiffener and panel is constructed using the technology of reference surface finite element, and the effect of contact is considered by using virtual bar element to avoiding the impossible overlapping deformation mode. The correctness of the model is testified by numerical examples. The effects of different dimension and location of crack on the post - buckling load of stiffened panels are studied. The numerical results show that the increase of crack＇ s size leads to decrease of post - buckling load of stiffened panel with changeless crack center location ; and the post - buckling load of stiffened panel of changeless crack dimension will lower with the location of crack center moving from edge to center of stiffener. However the post- buckling load remarkably decrease once stiffener end splits, and the effect to post -buckling load is apparently exceed stiffener center crack.