三维五向编织复合材料低速冲击损伤区域的量化表征  

Quantitative characterization of low-velocity impact damage in three dimensional five-directional braided composites

作　　者：孙梦尧 张典堂[1] 钱坤[1] SUN Mengyao;ZHANG Diantang;QIAN Kun(Key Laboratory of Eco-Textiles,Ministry of Education,Jiangnan University,Wuxi 214122,China)

机构地区：[1]江南大学生态纺织教育部重点实验室,无锡214122

出　　处：《复合材料学报》2023年第9期5411-5422,共12页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(11702115,12072131);江苏省基础研究计划(BK20211583)。

摘　　要：低速冲击损伤区域的可视化和量化表征对提高三维编织复合材料构件可靠性和承载效率极具意义。以三维五向编织复合材料为研究对象,使用落锤冲击仪对20°和40°编织试样开展了100 J低速冲击试验。在此基础上,利用Micro-CT对内部损伤区域进行了图像采集,并建立了基于阈值的整体损伤自动提取方法。之后,沿面内两个方向将损伤分别分割8部分获取了各截面的正面凹坑深度、背面凸起高度、损伤扩展长度、损伤面积和损伤体积等数据,并进行了三维统计分析。结果表明,损伤沿着冲击中心向四周拓展并呈现对称性,主要损伤分布依次是纤维损伤、基体损伤和界面脱粘。同时,20°编织试样比40°编织试样损伤更严重,且沿着轴纱方向,两种编织角试样的损伤扩展值更大。其中,20°样品轴向损伤扩展长度和损伤堆叠面积分别可达50.481 mm和437.039 mm^(2),均远超过对应横向的23.582 mm和104.004 mm^(2)。The visualization and quantification of low-velocity impact damage are significant for improving the reliability and load-bearing efficiency of 3D braided composites.The 100 J low-velocity impact tests were carried out on 20°and 40°braided samples with a drop hammer impact instrument.Micro-CT was used to acquire images of the internal damage based on a threshold-based automatic extraction method.Afterwards,the damage was divided into 8 parts along two directions to obtain the data of front pit depth,back bulge height,damage extension length,damage area and volume of each section.The results show that the main damages,such as fiber damage,matrix crack and interfacial debonding spread around the impact center symmetrically.Meanwhile,the damage of the 20°sample is more serious than that of the 40°sample,and the damage expansion is larger along the axial yarn direction.Among them,the axial damage extension length and damage stacking area of the 20°sample can reach 50.481 mm and 437.039 mm^(2),respectively,which are far greater than the corresponding lateral values of 23.582 mm and 104.004 mm^(2).

关 键 词：三维编织结构 碳纤维增强树脂基复合材料 低速冲击 损伤演化 MICRO-CT 

分 类 号：TB332[一般工业技术—材料科学与工程]