短纤维增强三元乙丙薄膜各向异性强度准则研究  

Study on anisotropic strength criterion of short fiber reinforced EPDM film

作　　者：谈炳东 郑健[1] 许进升[1] 贾云飞[1] Tan Bingdong, Zheng Jian, Xu Jinsheng, Jia Yunfei(School of Mechanical Engineering,Nanjing University of Science and Technology, Nanjing 21009)

机构地区：[1]南京理工大学机械工程学院,南京210094

出　　处：《化工新型材料》2018年第10期190-194,共5页New Chemical Materials

基　　金：国家自然科学基金(51606098);中央高校基本科研业务费专项资金(30915118805)

摘　　要：芳纶短纤维增强三元乙丙橡胶包覆材料是一种能与固体火箭发动机壳体连续缠绕固化成型的内绝热层材料。为了描述其在工作过程中表现的各向异性力学特性,通过单轴拉伸和偏轴拉伸实验,研究了材料的拉伸破坏机制。基于Tsai-Hill强度准则和余弦级数准则,预测了材料的抗拉强度、断裂伸长率和初始弹性模量随偏轴角度变化的曲线。结果表明,短纤维增强三元乙丙薄膜材料呈现出明显的平面正交各向异性,破坏机制复杂;45°偏轴拉伸法比多轴均值法预测误差小;余弦级数准则不需要通过实验或者计算获取面内剪切强度,且能够保证预测的准确性,实用性较强。Aramid short fiber reinforced EPDM coating material is a kind of heat-insulating material,which is winded and solidified with solid rocket motor case in general.In order to describe anisotropic mechanical properties during its working process,tensile failure mechanisms were studied by uniaxial tensile and off-axis tensile tests.Based on Tsai-Hill strength criterion and cosine series criterion,the curves of tensile strength,elongation at break and initial modulus with different off-axis angles were predicted.Results showed that short fiber reinforced EPDM film presented plane orthotropic properties obviously and had complex failure mechanisms.45°off-axis tension method was more effective than multi-axis average method in the base of Tsai-Hill strength criterion.It was also concluded that cosine series criterion can ensure the accuracy of prediction and had strong practicality.Meanwhile,it was unnecessary to obtain in-plane shear strength by experiment or calculation.

关 键 词：三元乙丙 各向异性 破坏机制 Tsai-Hill强度准则 余弦级数准则 

分 类 号：TB383.2[一般工业技术—材料科学与工程]