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缝合泡沫夹芯复合材料低速冲击的多尺度数值方法

, PP. 230-235

Keywords: 缝合,泡沫夹芯,多尺度,均一化,渐进损伤

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Abstract:

为了发展缝合泡沫夹芯复合材料低速冲击损伤的多尺度分析方法,建立了缝合泡沫简化力学模型,将缝合泡沫等效为缝线树脂柱增强的正交各向异性芯材,其材料参数由各组分性能及所占体积分数根据均一化理论计算得出;同时,建立冲击试验有限元模型,通过界面元模拟面板与芯材之间的层间分层。采用GENOA渐进损伤分析模块对缝合结构冲击动态响应过程进行数值模拟,并将计算结果与试验记录进行对比分析。结果表明:缝合可以减小面板破坏面积,抑制面板与泡沫分层的扩展;但缝纫会对结构造成初始损伤,较高的缝合密度使芯材刚度增加,不利于泡沫结构的缓冲吸能。数值模拟结果与试验记录吻合良好,验证了多尺度分析方法的正确性。

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