【作者】 刘波； 燕瑛； 齐忠新； 张涛涛； 金东升；

【机构】 北京航空航天大学航空科学与工程学院；

【摘要】 发展了一种基于纤维随机分布特性的细观力学有限元建模方法和纤维等效方法,提出了"宏纤维"概念,建立了"宏纤维"模型,并验证了纤维等效的正确性。基于纤维等效,综合考虑真实情况下编线造成的富树脂区对微观结构的影响,建立了T700经编织物单向板有限元模型,并对其拉伸性能进行了预报。对单向纤维树脂基增强复合材料T700/6808单向板进行了拉伸试验,得到了拉伸强度和拉伸模量的试验值。数值模拟结果与大部分试验结果吻合良好,表明发展的拉伸性能预报方法能较好的预测复合材料的拉伸性能。更多还原

【Abstract】 A method of micromechanical finite element modeling and fiber equivalent is developed based on randomly distributed characteristics of fibers.The concept of "macro fiber" is proposed,and a macro fiber model is established to verify the correctness of fiber equivalent.Basing on fiber equivalent and considering the real situation of resin-rich areas of the microstructure caused by the constrain of knit string,a model of T700 warp knitted fabric composite unidirectional laminates is established and the tension property is predicted.Tensile properties of fiber reinforced composite material T700/6808 unidirectional laminates are experimentally investigated,and then the experimental values of tensile strength and modulus are calculated.The numerical results agree well with most experimental results,indicating that the micromechanical finite element method can predict the tensile properties of composites correctly.更多还原