三维四向编织复合材料疲劳性能分析  

Fatigue Life Prediction of 3-D Four-Directional Braided Composites

作　　者：冯继强[1] 王新峰[1] 刘海 于健[1] FENG Jiqiang;WANG Xinfeng;LIU Hai;YU Jian(State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics & Astronautics, Nanjing, 210016, China;AVIC Chengdu Aircraft Industrial (Group) Co., LTD., Chengdu, 610092, China)

机构地区：[1]南京航空航天大学机械结构力学与控制国家重点实验室,南京210016 [2]中航工业成都飞机工业(集团)有限责任公司,成都610092

出　　处：《南京航空航天大学学报》2018年第1期45-52,共8页Journal of Nanjing University of Aeronautics & Astronautics

基　　金：机械结构力学及控制国家重点实验室基金(0214G02)资助项目;江苏省高校优势学科建设工程资助项目

摘　　要：建立基于八边形纤维束截面假设的三维四向编织复合材料单胞模型。基于单向复合材料疲劳剩余刚度和剩余强度模型,结合组分材料的疲劳失效判据和性能突降方法,建立了三维四向编织复合材料疲劳寿命预测模型。利用ABAQUS有限元软件UMAT开发了疲劳寿命预测与渐进损伤分析程序,研究了三维四向编织复合材料在不同应力水平下的损伤扩展过程和疲劳寿命。研究表明,疲劳损伤是从纤维束之间的接触面的单元开始发生损伤破坏,然后向纤维束表面以及纤维束内部开始扩散,并且损伤扩展速率随着应力水平的提高而加快。本文研究为预测三维四向编织复合材料的疲劳寿命提供了一种途径。The unit cell model of three-dimensional and four-directional braided composites with an octagonal fiber cross section is established.Based on the fatigue residual stiffness and strength model of unidirectional composites,the fatigue life prediction model of three-dimensional and four-directional braided composites is created by combining the fatigue failure criteria and performance damping method of component materials.The fatigue life prediction and progressive damage analysis program is developed by using ABAQUS finite element software UMAT to simulate the fatigue life and damage propagation process of three-dimensional and four-directional braided composites under fatigue loading.The results show that fatigue damage starts from the elements of contact area between the fiber bundles,and then it spreads to the surface and interior of fiber bundles.Moreover,the damage propagation accelerates with the increase of stress level.This is a new way for predicting the fatigue life of three-dimensional and four-directional braided composites.

关 键 词：编织复合材料 单胞 疲劳寿命 刚度退化 Hashin准则 

分 类 号：TB332[一般工业技术—材料科学与工程]