基于ANSYS应力强度因子法的压力钢管安全评估  

Safety Assessment of Penstock in Power Station Based on Stress Intensity Factor Using ANSYS

作　　者：李东明[1,2] 杜蔚琼 毋新房 LI Dong-ming;DU Wei-qiong;WU Xin-fang(Quality Inspection and Testing Center for Hydraulic Metal Structures under Ministry of Water Resources,Zhengzhou 450044, China;School of Land Science and Technology,China University of Geosciences(Beijing),Beijing 100083,China)

机构地区：[1]水利部水工金属结构质量检验测试中心,郑州450044 [2]中国地质大学(北京)土地科学技术学院,北京100083

出　　处：《长江科学院院报》2021年第5期55-60,共6页Journal of Changjiang River Scientific Research Institute

基　　金：国家重点研发计划项目(2016YFC0402000)。

摘　　要：基于ANSYS Workbench断裂分析模块,根据某小型水电站压力钢管部分管段纵焊缝未焊透的情况,建立含未焊透缺陷钢管段有限元模型,求解管壁的环向应力,并确定16Mn钢的临界应力强度因子。按照焊缝缺陷特征在管壁建立裂纹的有限元网格,再次计算并提取正常发电工况及水锤工况下钢管缺陷尖点的Ⅰ型应力强度因子。根据临界应力强度因子判断准则,其未焊透缺陷不影响钢管的安全性,在后续检测中未发现缺陷有扩展趋势。To assess the safety of penstock in a small power station where some segments of penstock are defective with incomplete longitudinal weld,we built the finite element model of the penstock segment which contains such defects using ANSYS Workbench to solve the circumferential stress of penstock wall,and to determine the critical stress intensity factor of 16Mn steel.Furthermore,we built the finite element meshes of fractures in accordance with the weld’s defect characteristics and calculated the type I stress intensity factor at the tip of defect.Finally,according to the criterion of critical stress intensity factor,we concluded that the weld defects had no impact on the penstock safety,and did not expand in subsequent inspections.

关 键 词：压力钢管 安全评估 未焊透缺陷 ANSYS 有限元 应力强度因子 

分 类 号：TV313[水利工程—水工结构工程]