热交换管内壁子午面半椭圆裂纹应力强度因子数值计算  

Numerical calculation of the stress intensity factor of heat exchange tube inner surface meridian plane containing semi-elliptical crack

作　　者：李东方[1] 杨海波[2] 毛朝晖 张成龙 LI Dong-fang;YANG Hai-bo;MAO Zhao-hui;ZHANG Cheng-long(School of Mechanical and Electrical Engineering,Quzhou College of Technology,Quzhou 324000,China;School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China;Technique Department of Nuclear Power Equipment,China First Heavy Industries Dalian Engineering Technology Co.,Ltd.,Dalian 116600,China;Zhejiang Sunlong Robot Technology Co.,Ltd.,Jinhua 321000,China)

机构地区：[1]衢州职业技术学院机电工程学院,浙江衢州324000 [2]北京科技大学机械工程学院,北京100083 [3]中国一重集团大连工程技术有限公司核电装备技术部,辽宁大连116600 [4]浙江逊龙机器人科技有限公司,浙江金华321000

出　　处：《机电工程》2020年第3期253-258,共6页Journal of Mechanical & Electrical Engineering

基　　金：国家重大科学仪器设备开发专项项目(2011YQ14014505);重大专项示范工程福清1(2)号核反应堆压力容器项目(H123414(15)45);浙江省衢州市科技局计划项目(2017G13)。

摘　　要：针对热交换管内壁存在的应力腐蚀开裂的强度问题,对内壁子午面半椭圆裂纹应力强度因子K_I求解模型进行了研究。使用了机加工的方法制作裂纹模型,并利用了光弹法测定K_I,进行了数值求解模型可靠性验证;对热交换管内壁子午面半椭圆裂纹在复杂载荷、不同裂纹深度a(1 mm、1.25 mm、1.5 mm及1.75 mm)和不同裂纹形状比a/b(0.1、0.2、0.3…0.8及0.9)下的K_I分布与扩展规律进行了归纳,提出了一些热交换管的疲劳寿命设计、可靠性分析或工况监测建议。研究结果表明:内壁所受压力P_i决定了K_I分布值大小,内外壁温度差ΔT对K_I分布影响也相对较大;将数值解和实验解、文献解进行了对比,其结果相互吻合较好。Aiming at the strength of stress corrosion cracking on the inner wall of heat exchange tube, the K_I model for stress intensity factor of inner surface meridian plane containing semi-elliptical crack was studied. The crack model was prepared by mechanical process which got the K_I determined by photo elastic method. The reliability verification of the numerical solution model was carried out. Additionally, the law of distribution and expansion of K_I values was summarized under complex loads, different crack depths, a,(i.e. 1 mm, 1.25 mm, 1.5 mm and 1.75 mm) and different crack shape ratios, a/b,(i.e. 0.1, 0.2, 0.3... 0.8 and 0.9). Some suggestions on reliability analysis of fatigue life design, working condition monitoring of heat exchange tube were put forward. The results indicate that the pressure, P_i, on the inner wall determines the K_I distribution, in addition, the temperature difference between inner wall and outer wall, ΔT, is also relatively large influence on the K_I distribution. Meanwhile, some numerical calculation values are compared with the experimental values and manual calculation values which shows that the values fit preferably.

关 键 词：应力强度因子 内壁子午面半椭圆裂纹 应力腐蚀开裂 热交换管 数值计算 

分 类 号：TH123.3[机械工程—机械设计及理论] TK172.4[动力工程及工程热物理—热能工程]