非线性复合材料层板分层屈曲及后屈曲分析  

Buckling and Postbuckling Analysis of Nonlinear Composite Laminates with Delamination

作　　者：张凤鹏[1] 黄宝宗[1] 牛晚扬[2] 崔崧[1] 

机构地区：[1]东北大学理学院,辽宁沈阳110006 [2]沈阳建筑工程学院,辽宁沈阳110015

出　　处：《东北大学学报（自然科学版）》2000年第3期343-346,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金!(194 72 0 79);东北大学青年基金!(870 55)

摘　　要：基于修正的Hahn Tsai非线性本构关系 ,用准三维有限单元法分析了材料非线性对对称角铺设复合材料层板分层屈曲、后屈曲以及能量释放率的影响 ,提出一种修正的反幂法计算材料非线性层板的临界载荷· 与不考虑材料非线性结果比较表明 :材料非线性使复合材料层板的屈曲载荷降低 ,降低幅度与分层长度和纤维铺设方向有关 ;能量释放率及其组分均有不同程度增加 ;后屈曲变形加快 ,裂尖层间应力奇异程度下降·Based on Hahn Tsai nonlinear constitutive relation,buckling,postbuckling,energy release rate and crack tip fields of composite laminates with a through width delamination were analyzed by quasi 3D FEM. A modified converse power method was set forth to compute the critical loads of nonlinear laminates. Compared with linear cases,the effect of material nonlinearity on critical loads depends on the ratio between the length and the thickness of delamination (2 a/h′ ) and the stacking angle θ of the ply. When 2a/h′ becomes smaller and θ bigger, the critical load decreases obviously, otherwise, the effect of material nonlinearity is small and can not be taken into account. Energy release rate G and its component G Ⅰ and G Ⅱ all increase evidently;around delamination tip, interlaminar stress singularity reduces but displacements increase obviously.

关 键 词：非线性复合材料 层析分层 屈曲 后屈曲 

分 类 号：TB33[一般工业技术—材料科学与工程]