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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。
A double-cantilever beam (DCB) test was used to study the tortuous fracture path of the interface crack of glass fiber reinforced composite sandwich core with different density of PMI foam core. Based on the MPM method, a MPM model is established to fit the experimental study. The crack tip modes and the bending failure angle of the interface crack are calculated at different panel / core modulus ratios. Combined with the twists and turns The failure criterion simulates the path of the interface crack. The numerical simulation results are in good agreement with the experimental ones, which shows the effectiveness of the numerical analysis models and methods in this paper. The results show that the more serious the mismatch between the modulus of the panel material and the core material is, the larger the failure angle of the interface crack is. When the crack is folded into the core, the fracture mode is basically parallel to the mode Ⅰ loading mode Expanded in the direction of the interface.