-196℃奥氏体不锈钢母材与焊缝的动态断裂韧性  

Dynamic fracture toughness of S30408 austenitic stainless steel base and weld metals at -196℃

作　　者：潘建华[1,2] 陈学东[1,2] 韩豫[3] 

机构地区：[1]中国科学技术大学中国科学院材料力学行为和设计国家重点实验室,安徽合肥230027 [2]合肥通用机械研究院国家压力容器与管道安全工程技术研究中心,安徽合肥230031 [3]宁波工程学院机械工程学院,浙江宁波315016

出　　处：《爆炸与冲击》2013年第4期381-386,共6页Explosion and Shock Waves

基　　金：合肥通用机械研究院青年科技基金项目(2011011268)

摘　　要：在-196℃对S30408奥氏体不锈钢的母材和焊缝进行了夏比摆锤冲击实验,采用改进的柔度变化率法得到了低温下不锈钢母材夏比试样的起裂点。结果表明,采用改进的柔度变化率法得到的结果比采用传统的柔度变化率法得到的结果更准确。根据实验得到的载荷-位移曲线,结合采用Schindler法和关键曲线法各自所得结果的优点,得到了不锈钢母材的动态裂纹扩展阻力曲线(动态J-R曲线)。依据不锈钢焊缝在低温动载下的载荷-位移曲线及其断裂特征,通过线弹性断裂力学计算获得其动态断裂韧性。Abstract： Charpy pendulum impact tests were carried out on S30408 austenitic stainless steel base and weld metals at --196 ℃. The modified compliance changing rate method was used to obtain the crack initiation point of the base metal specimen. The analyses show that the results obtained by the im- proved method are more accurate than those by the traditional compliance changing rate method. Based on the experimental load-displacement curves, the Schindler procedure and key curve method were combined to achieve the dynamic crack growth resistance curve of the base metal. According to the load-displacement curves of the weld metal and its fracture characteristics, the dynamic fracture toughness of the weld metal was calculated by the linear elastic fracture mechanics approach.

关 键 词：爆炸力学 动态断裂韧性 夏比冲击实验 奥氏体不锈钢 低温 改进的柔度变化率法 Schindler法 关键曲线法 动态裂纹扩展阻力曲线 

分 类 号：O382.3[理学—流体力学]