核电厂主蒸汽管道材料断裂韧性试验三维数值模拟研究  

Three-dimensional Numerical Investigation on Fracture Toughness Testing of SA335 P11 Alloy Steel for PWR Main Steam Piping

作　　者：张旭[1] 窦一康[1,2] 梁兵兵[1] 

机构地区：[1]上海核工程研究设计院,上海200233 [2]上海发电设备成套设计研究院,上海200240

出　　处：《动力工程学报》2016年第1期74-78,共5页Journal of Chinese Society of Power Engineering

摘　　要：基于商用软件ABAQUS对国产化主蒸汽管道材料P11合金钢的断裂韧性试验中起裂前的加载过程进行了精细的三维数值模拟,对含侧槽和光滑侧面2种标准CT试样结构进行建模分析,获得加载过程中裂纹前沿的塑性区、应力场和J积分的三维精细分布及变化规律.开展了SA335P11合金钢材料含侧槽结构试样的断裂韧性试验,试验中载荷线位移响应曲线与有限元分析结果具有很好的一致性,验证了数值分析的有效性.通过有限元和试验相结合的方式,确定了延性金属材料试样采用光滑侧面结构是导致其试验过程中难以起裂的主要原因,含侧槽结构试样能为裂纹尖端提供有效约束,使得裂纹前沿附近区域的塑性区尺寸、局部J积分和张开应力分布更加均匀,对优化延性金属材料断裂韧性试验作用明显.Using commercial software ABAUQS, a detailed three-dimensional finite element analysis was conducted to the loading process before breaking of SA335 Pll alloy steel for PWR main steam piping dur- ing fracture toughness test, so as to numerically analyze the toughness of standard CT specimens with and without side grooves, and to obtain the distribution and variation law of the plastic zone, stress field and local J integrals around the crack front. Meanwhile, a fracture toughness test was carried out to Pll alloy steel specimens with side grooves, and the load-displacement curves agreed well with those of finite ele- ment analysis, proving the numerical method to be effective. Based on both the finite element analysis and experimental tests, it has been found that for testing of ductile metals, the specimen with plane-sided structure is hard to get cracking, and the structure with side groove is believed to be a better choice, as it keeps providing high level of constraints around crack front, which makes the distribution of plastic zone dimension, local J integrals and the opening stress become more uniform, and therefore helps to optimize relevant test procedures.

关 键 词：国产化P11合金钢 有限元三维模拟 断裂韧性试验 侧槽结构 应力应变场 

分 类 号：TL353[核科学技术—核技术及应用]