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中文摘要：
对短切纤维增韧泡沫夹芯复合材料梁界面韧性试验结果进行了分析讨论并基于物质点方法（material point method,MPM）对试验过程进行了数值模拟。在MPM方法中，通过可视准则引入不连续性来处理裂纹问题，发展了包含裂纹的MPM算法，模拟了泡沫夹芯复合材料梁界面断裂试验过程，数值分析结果和试验数据取得了良好的一致性。研究结果表明短切纤维增韧工艺能够显著提高泡沫夹芯复合材料结构的界面韧性和承载能力，同时表明该文推导的包含裂纹的MPM方法处理断裂问题的精确性和有效性。
英文摘要：
The experimental results of the interfacial toughness of foam core composite sandwich beams with chopped-fiber enhanced interface were discussed in detail, and the experimental process was numerically simulated based on the material point method （MPM）. For the sake of handling cracks in numerical simulation, MPM algorithm with cracks was developed, in which discontinuity was introduced into MPM by visibility rule. The interfacial fracture process of the experiment was simulated by MPM, and good accordance was found between the numerical results and that of the experiment. Overall, the study indicates that the chopped-fiber enhancement technique can significantly promote the interfacial toughness as well as the interracial load capacity of foam core composite sandwich structures, and that the MPM algorithm with cracks presented in this paper is efficiency and accuracy for a fracture analysis.
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