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泡沫夹芯复合材料梁界面裂纹曲折扩展实验与数值模拟

, PP. 129-135

Keywords: 复合材料夹芯梁,界面断裂,曲折破坏,裂纹扩展路径,物质点方法

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Abstract:

采用双悬臂梁(DCB)试验研究了具有不同密度的PMI泡沫芯体的玻璃纤维增强复合材料夹芯梁界面裂纹曲折破坏路径。基于包含裂纹的物质点算法(MPM),建立了与试验研究相适应的MPM模型,在不同的面板/芯体模量比下计算了界面裂纹裂尖模态比和曲折破坏角,并结合曲折破坏准则模拟了界面裂纹曲折破坏路径。数值模拟结果和试验现象吻合良好,说明了本文中数值分析模型和方法的有效性。研究结果表明,面板材料和芯体材料模量失配越严重,界面裂纹发生曲折破坏时的破坏角越大;裂纹折入芯体后,在Ⅰ型为主的加载模式的支配下以基本平行于界面的方向扩展。

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