【作者】 金君杭； 段成红； 吴港本； 梁文硕； 罗翔鹏；

【Author】 JIN Junhang;DUAN Chenghong;WU Gangben;LIANG Wenshuo;LUO Xiangpeng;College of Mechanical and Electrical Engineering,Beijing University of Chemical Technology;

【机构】 北京化工大学机电工程学院；

【摘要】 二维三轴编织复合材料(2DTBC)因其优异的力学性能已广泛应用于航空航天等诸多领域,其力学响应及损伤破坏不仅仅受加载和约束等宏观因素的影响,也与编织工艺参数等细微观性能有关。为了掌握细微观结构对宏观性能的影响,本文基于微观—细观—宏观多尺度分析方法对2DTBC拉伸性能及其损伤进行研究。研究结果表明:微观尺度纤维束有限元模型预测结果与Chamis公式计算结果吻合度较高,其预测误差均小于12%;细观尺度上明晰了编织工艺参数对材料等效工程常数的影响规律且与实验结果一致,其中纵向参数影响较为明显;宏观拉伸试件在未达到断裂应变前,其应力应变关系表现为线性关系,编织角与拉伸强度呈负相关。更多还原

【Abstract】 Two-dimension triaxially braided composite(2DTBC) have been widely used in many fields such as aerospace due to their excellent mechanical properties.Its mechanical response and damage and failure are not only affected by macro factors such as loading and constraints,but also related to micro and meso properties such as component properties.In order to understand the influence of its micro and meso structure on its macro properties,we studied the tensile properties and damage of 2DTBC by using the multi-scale analysis method.The research results indicate that the prediction results of the micro-scale fiber bundle finite model are in good agreement with the results calculated by the Chamis formula,with prediction errors less than 12%.On the meso-scale,we clarified the influence rules of braiding process parameters on the equivalent engineering constant,which is consistent with the experimental results.And longitudinal parameters exhibit a more pronounced effect.On the macro-scale,the stress and strain of the tensile specimen shows a linear relationship before the specimen reaches the failure strain.Additionally,the braiding angle is inversely correlated with the tensile strength.更多还原