应力波载荷作用下弹塑性断裂全过程的动态分析  

DYNAMIC ANALYSIS OF THE ELASTIC-PLASTIC FRACTURE OF MATERIALS UNDER A STRESS WAVE LOAD

作　　者：沙桂英 杨丽颖[1] 姜风春 刘瑞堂[2] 

机构地区：[1]济南大学 [2]哈尔滨工程大学,黑龙江哈尔滨150001

出　　处：《兵工学报》2003年第3期403-407,共5页Acta Armamentarii

摘　　要：本文利用Hopkinson单压杆实验装置 ,对材料的弹塑性动态断裂特性进行了研究 ,建立了应力波载荷作用下动态裂纹起裂、扩展、止裂全过程的动态分析方法 ,采用该方法可同时测得材料的动态断裂韧性、裂纹扩展速度和止裂韧性。 90 7A钢三点弯曲试样的实验结果表明 ,该钢的动态裂纹扩展是先加速后减速过程 ,在 1 4 9× 10 7MPam /s的加载速率下 ,最大裂纹扩展速度为 2 36 13m/s ,动态断裂韧性和止裂韧性分别为JⅠd=5 5 2 .4 2kJ/m2 ,JIa=4 14 .0 5kJ/m2 .Elastic plastic fracture characteristics of materials were analyzed using the Hopkinson pressure experimental apparatus A method for analyzing the whole course of crack initiation, propagation and arrest under a stress wave load was established. The dynamic fracture toughness, crack propagation velocity and arrest toughness of materials were simultaneously obtained with this method. The results on steel 907A show that the behavior of dynamic crack propagation proceeds as an acceleration followed by a deceleration. The maximum crack propagation velocity for steel 907A is 236 13m/s under the loading rate 1 49×10 7MPam/s, and the dynamic fracture toughness and arrest toughness are respectively, J Ⅰd =552 42kJ/m 2 and J Ⅰa =414 05kJ/m 2.

关 键 词：应力波载荷 弹塑性断裂 动态断裂 裂纹 冲击响应 韧性 907A钢 

分 类 号：O346.1[理学—固体力学] TG142[理学—力学]