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拉挤型CFRP管轴压性能

DOI: 10.3969/j.issn.1006-7043.201411023

Keywords: 碳纤维复合材料|弧长法|稳定系数|长细比

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Abstract:

航天器骨架结构通常由轻质高强CFRP(carbon fiber reinforced polymer)复合材料管制成, 其稳定承载力成为结构安全性能的一项重要指标。对CFRP短管进行轴压试验, 重点研究碳纤维增强复合材料的刚度、极限强度以及细观破坏模式。基于Hashin破坏准则进行二次开发, 采用ANSYS有限元软件对试验过程进行了数值模拟, 数值结果表明, Hashin破坏准则可以较好地预测CFRP复合材料破坏时的极限承载力。基于Hashin破坏准则, 采用弧长法对试验工况中的5组长细比的CFRP细长管进行数值模拟, 绘制荷载-跨中挠度曲线, 总结其破坏特点、变形特征, 与试验对比吻合较好。通过参数分析, 并根据试验结果与数值分析结果, 拟合得到了拉挤型CFRP细长管稳定系数Φ与长细比λ之间的关系曲线, 方便工程使用。

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