应变率及CCVC界面层对CALL材料拉伸性能的影响

用自行研制的旋转盘式杆杆型冲击拉伸装置实施了ＣＦＲＰ／Ａｌ超混杂复合材料（ＣＡＬＬ）以及带有ＣＣＶＣ界面层的ＣＡＬＬ冲击拉伸加载及加卸载试验；用岛津试验机测定了它们的准静态拉伸及层间剪切性能材料在准静态拉伸时，应力－应变曲线无明显的屈服点，呈脆性断裂；而冲击拉伸时，应力－应变曲线有明显屈服点，呈脆－韧性断裂，动态失稳应变是准静态的３—４倍无论是准静态拉伸还是冲击拉伸，ＣＡＬＬ均存在明显的正混杂效应；ＣＡＬＬ（ＣＣＶＣ）层间剪切强度比ＣＡＬＬ约高１０％；在同一应变率下，ＣＡＬＬ（ＣＣＶ）的拉伸强度及失稳应变均比ＣＡＬＬ高．文中详细讨论以上试验现象，得出一些有意义的结论

THE EFFECT OF STRAIN RATE AND CCVC INTERFACIAL LAYER ON MECHANICAL BEHAVIOUR OF CALL

In this paper, the loading and loading-unloading tests of CALLand CALL(CCVC) under tensile impact have been carried out by a self-designed Rotating Circular Disk Tensile Impact Apparatus.The quasi-static tension and short beam bending tests are performed on the Shimadzu-5000 testing apparatus. Experiment results show: that both CALL and CALL(CCVC) have positivehybird effect. Under quasi-static tension, the composites have no obvious yielding until fracture, but have an obvious yielding point at the dynamic tensile stress-strain curves. The dynamic unstable fracture strain is aboutthree times the static unstable fracture strain. The interlaminar shear strength(ISS) of CALL(CCVC) is 10% more than that of CALL. At the same time, the tensile strength and unstable fracture stain of CALL(CCVC) are also higher than that of CALL. Some conclusions are also drawn from the SEM observation of the fracture specimen surface.Correspondent: RAO Shiguo, Department of Morden Mechnics, University of Science and Techology of China, Hefei 230026