短纤维增强三元乙丙薄膜各向异性强度准则研究
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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.
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.
引文
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[16]邹宗勇,韩建,刘杭锋,等.PVC建筑膜材拉伸异向性能研究[J].浙江理工大学学报,2010,27(2):186-190.
[17]Tan S C,Cheng S.Failure criteria for fibrous anisotropic materials[J].Journal of Materials in Civil Engineering,1993,5(2):198-211.
[18]Pan N,Yoon M Y.Structural anisotropy,failure criterion,and shear strength of woven fabrics[J].Textile Research Journal,1996,66(4):238-244.
[19]谈炳东,许进升,贾云飞,等.短纤维增强EPDM包覆薄膜超弹性本构模型[J].力学学报,2017,49(2):317-323.
[2]王纪霞,张志鹏,赵荣,等.三元乙丙橡胶绝热层力学性能的改善[J].航天制造技术,2013(4):41-44.
[3]郑元锁,张文.芳纶短纤维增强天然橡胶耐磨材料的研究[J].高分子材料科学与工程,2000,16(4):92-95.
[4]张飞飞,陈劼实,陈军,等.各向异性屈服准则的发展及实验验证综述[J].力学进展,2012,42(1):68-80.
[5]Hill R.A Theory of the yielding and plastic flow of anisotropic metals[J].Proceedings of the Royal Society of London,1948,193(1033):281-297.
[6]Tsai S W,Wu E M.A general theory of strength for anisotropic materials[J].Journal of Composite Materials,1971,5(1):58-80.
[7]卫东,王臣,向阳,等.建筑膜材的材性试验研究[J].空间结构,2002,8(1):37-43.
[8]易洪雷,丁辛,陈守辉.PES/PVC膜材料拉伸性能的各向异性及破坏准则[J].复合材料学报,2005,22(6):98-102.
[9]蒋邦海,张若棋.一种碳纤维织物增强复合材料应变率相关的各向异性强度准则[J].爆炸与冲击,2006,26(4):333-338.
[10]汪泽幸,蒋金华,陈南梁,等.机织物增强双层柔性复合材料拉伸异向性能及其失效准则[J].纺织学报,2014,35(8):38-43.
[11]张少实.复合材料与粘弹性力学[M].北京:机械工业出版社,2005.
[12]李佳,肖岩,杨瑞珍,等.典型胶合竹剪切强度试验研究[J].工业建筑,2015,45(4):7-12.
[13]徐琪.复合材料面内剪切性能测试方法的研究[J].玻璃纤维,2012(3):6-10.
[14]陈守辉.机织建筑膜材料拉伸性能研究[D].上海:东华大学,2008.
[15]Chawl K K.Composite materials:science and engineering[J].Composites,1987,20(3):286-286.
[16]邹宗勇,韩建,刘杭锋,等.PVC建筑膜材拉伸异向性能研究[J].浙江理工大学学报,2010,27(2):186-190.
[17]Tan S C,Cheng S.Failure criteria for fibrous anisotropic materials[J].Journal of Materials in Civil Engineering,1993,5(2):198-211.
[18]Pan N,Yoon M Y.Structural anisotropy,failure criterion,and shear strength of woven fabrics[J].Textile Research Journal,1996,66(4):238-244.
[19]谈炳东,许进升,贾云飞,等.短纤维增强EPDM包覆薄膜超弹性本构模型[J].力学学报,2017,49(2):317-323.