建立了复合材料层合加筋壁板的屈曲后屈曲有限元分析模型.该模型采用界面单元以有效模拟筋条和壁板之间的连接界面,连接界面和复合材料层板分别采用Quads和Hashin失效准则作为失效判据,引入材料刚度退化模型,采用非线性有限元方法,研究了复合材料加筋壁板在压缩载荷下的前后屈曲平衡路径及破坏过程.数值分析结果与实验结果吻合良好,证明了该方法的合理有效性.详细探讨了筋条尺寸及界面单元强度等参数对加筋壁板屈曲后屈曲行为及承载能力的影响规律,研究表明增加筋条截面惯性矩及筋条密度在一定程度上能有效提高加筋板的屈曲载荷与极限强度,筋条密度增加到一定程度会引起结构破坏形式由失稳破坏转变为压缩破坏,界面强度与铺层方式对极限强度有重要影响,界面脱粘是引起加筋板最终破坏的重要因素.
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