复合材料气瓶多尺度渐进失效分析与爆破压力预测
首发时间:2012-12-12
摘要:复合材料是一种力学性能复杂的新型材料,目前国内外关于失效分析的研究多局限于宏观尺度范围,无法揭示复合材料细观失效机理。多尺度分析方法是将宏观损伤和细观破坏失效相连接的桥梁,本文引入该方法对铝内衬碳纤维增强复合材料气瓶进行了有限元分析和爆破压力预测。首先,运用ANSYS-APDL语言建立复合材料气瓶参数化有限元模型,然后引入多尺度分析方法的结果,基于ABAQUS-UMAT编程,对气瓶进行有限元分析,得到其应力分布状况,并预测气瓶爆破压力。最后将爆破压力预测值与试验值比较,进一步验证有限元建模与分析方法的准确性。
关键词: 航空、航天复合材料 复合材料气瓶 多尺度分析方法 参数化建模 有限元分析 爆破压力预测
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Multiscale progressive failure analysis and burst pressure prediction of composite cylinders
Abstract:Composite is a new kind of material with complicated mechanical properties. So far, the progressive failure analysis on composite cylinders is concentrated on the macroscopic failure analysis which yet can not reveal the microscopic failure mechanisms.The multiscale analysis method is a bridge to link the macroscopic failure performance with the microscopic failure evolvement. This method is introduced to predict the failure properties and ultimate burst pressure of aluminum-lined carbon fiber composite cylinders in this paper. The parametric mesh model of cylinder is established using ANSYS-APDL, and the multiscale analysis method is used to analyze the macroscopic progressive failure of the composite cylinders basing on ABAQUS-UMAT. The predicted failure strengths of the composite cylinders are compared with the experimental results to verify the accuracy of the finite element modeling and analysis method.
Keywords: aerospace composite materials composite cylinder multiscale analysis method parametric modeling finite element analysis burst pressure prediction
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