K_(IC)梯度复合材料的裂纹扩展性能设计与试验  

Design and crack growth experiment of K_(IC) gradient composite

作　　者：魏凤春[1] 张晓 姚树燕[1] 张恒[1] 

机构地区：[1]郑州大学材料学院,河南郑州450052 [2]河南省公路工程局集团有限责任公司,河南郑州450052

出　　处：《材料热处理学报》2008年第6期18-20,共3页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金项目(10472106)

摘　　要：通过不同材料配方使复合材料板内沿厚度方向的断裂韧性呈梯度变化,推导出梯度复合材料在任一点处的断裂韧性值KIC表达式。根据所得到的KIC表达式,调整材料配方设计并制备出所需要的KIC梯度复合材料。采用落重冲击试验方法进行了断裂性能验证试验,观察裂纹的实际扩展情况。结果表明:由KIC梯度复合材料制成的结构在冲击条件下,层内引发的宏观裂纹在低KIC板面内高速扩展,而沿厚度方向随着KIC的增大,裂纹传播困难,满足KIC梯度复合材料设计要求。A KIC gradient composite plate was designed and prepared with different material prescriptions in different layers. The expression of fracture toughness at any point within the gradient composites was derived. The crack propagation behavior was examined by drop-weight impact test. The results show that under impacting, the macro-crack propagates rapidly in the layer with lower KIC value of the plate because of the structure of this gradient composite material, but the high crack propagation resistance in the thickness direction of the plate observed.

关 键 词：K_(IC)梯度复合材料 断裂韧性 梯度变化 

分 类 号：TB332[一般工业技术—材料科学与工程]