摘要
基于六边形单胞模型,构建了宏细观结构力学响应场间的关联矩阵,建立了低温推进剂复合材料贮箱结构的宏细观一体化分析方法,采用工程常用的能够预测不同失效模式的宏细观强度准则,对机械和温度载荷下复合材料层合板的基体开裂进行预测。结果表明:在机械载荷下,与试验数据相比,宏观Hashin准则、改进的宏观Tsai-Wu准则、细观最大应力准则和细观Hashin准则均具有良好的预测精度。但在温度载荷下,由于考虑了组分材料间热力学性能的不匹配,使用细观强度准则与宏观强度准则预测的结果相比具有一定差异。通过对不同载荷情况下基体开裂预测结果的分析,提出了采用细观最大应力准则作为基体开裂判据,同时结合考虑组分材料热力学性能差异影响的宏细观一体化分析方法,可以有效地对低温推进剂复合材料贮箱结构的基体开裂进行预测。
Based on the hexagon unit cell,the correlation matrices between the mechanical response fields of macro and micro structures are constructed,and an integrated macro/micro analysis method in composite cryogenic propellant tanks is established in this paper. With the commonly used engineering strength criteria capable of predicting the different damage modes,the matrix cracking in the composite laminate is predicted under the mechanical and temperature loads.Results show that the following criteria agree well with the test data under the mechanical loads,including the macroscopic Hashin criterion,modified macroscopic Tsai-Wu criterion,microscopic maximum stress criterion and microscopic Hashin criterion. However,considering the mismatching of the thermo-mechanical properties between the constituent materials,the predicted results using the microscopic strength criteria have imparities compared with the results using the macroscopic strength criteria under the thermal loads. Based on the comparison and analysis of the predicted results of the matrix cracking under different loads,the integrated macro/micro analysis method is proposed by utilizing the microscopic maximum stress criterion. Moreover, this method considers the effect of the imparities in the thermo-mechanical properties between the constituent materials,and is an effective way for the matrix cracking prediction of the composite tanks.
出处
《宇航学报》
EI
CAS
CSCD
北大核心
2017年第9期1005-1012,共8页
Journal of Astronautics
基金
国家自然科学基金(11372058)
国家973计划(2014CB046506
2014CB049000)
