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提出了一种基于ABAQUS的固体火箭发动机复合材料壳体快速化建模方法。通过编写PYTHON脚本程序,实现将缠绕软件生成的信息文件进行数据处理,导入ABAQUS中参数化生成有限元模型的建模功能。通过数值分析中的B样条函数法对缠绕软件导出的波动数据进行光滑处理,并分析其在压力载荷工况下的力学性能变化。使用干法预浸带缠绕壳体,通过水压爆破实验结果与有限元结果进行对比,验证建模方法的准确性。结果表明,快速化建模方法建立的壳体有限元模型在压强为26.02 MPa时发生了失效,水压爆破实验中内压达到27 MPa时壳体失效,有限元模型的位移和失效形式等均能与实验结果吻合较好。基于ABAQUS的固体火箭发动机复合材料壳体快速化建模方法能较准确地对壳体的实际工作情况进行预测。 相似文献
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针对孔隙率为4.08%和4.20%,孔隙长度尺寸范围分别为6.34~216.78μm,6.34~722.25μm的两组碳纤维增强复合材料试样,依据基于随机介质理论和统计学方法建立随机孔隙模型(Random Void Model,RVM)的思想,研究了孔隙建模原理和方法。将孔隙按照长度进行分级,分别建立对应不同尺寸级别的孔隙模型,然后将各个级别的孔隙模型进行叠加。与金相照片对比结果表明,采取分级孔隙建模思想得到的孔隙模拟结果与实际孔隙形貌之间的几何相似度很高,为后续数值计算提供了模型基础。 相似文献
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气流通过Helmholzt振荡腔产生脉动气流.实验固定振荡腔进出口直径和振荡腔直径, 在改变振荡腔腔长的情况下, 在圆管进口Re为22000到82000范围内对等热流加热条件下的圆管换热实验进行了研究.实验将脉动气流所产生的圆管换热效果与定常气流产生的换热效果进行对比.结果表明:气流流经Helmholzt振荡腔后对圆管换热有强化作用, 其强化作用主要集中在沿圆管轴向前10倍直径的长度上, 强化比约为1.1-1.9.随着距离增大换热强化比迅速减小.振荡腔腔长对换热效果有较强的影响. 相似文献
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LIANG Yanmin ZU Qingming LIANG Xuhao YE Zhoujun SHI Wenfeng LI Zongzhou DONG Bin JIANG Hao 《上海航天》2022,39(1):129-136
In order to explore the bonding failure mechanism of high modulus carbon fiber composite materials, the tensile experiment and finite element numerical simulation for single-lap and bevel-lap joints of unidirectional laminates are carried out, and the stress distributions, the failure modes, and the damage contours are analyzed. The analysis shows that the main reason for the failure of the single-lap joint is that the stress concentration of the ply adjacent to the adhesive layer is serious owing to the modulus difference, and the stress cannot be effectively transmitted along the thickness direction of the laminate. When the tensile stress of the ply exceeds its ultimate strength in the loading process, the surface fiber will fail. Compared with the single-lap joint, the bevel-lap joint optimizes the stress transfer path along the thickness direction, allows each layer of the laminate to share the load, avoids the stress concentration of the surface layer, and improves the bearing capacity of the bevel-lap joint. The improved bearing capacity of the bevel-lap joint is twice as much as that of the single-lap joint. The research in this paper provides a new idea for the subsequent study of mechanical properties of adhesively bonded composite materials. 相似文献
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