钻井泵泵头体疲劳裂纹扩展分析  

Analysis of fatigue crack growth of drilling pump head body

作　　者：侯勇俊[1] 唐煌 HOU Yong-jun;TANG Huang(School of Mechanical Engineering,Southwest Petroleum University,Chengdu,610500,China)

机构地区：[1]西南石油大学机电工程学院,四川成都610500

出　　处：《塑性工程学报》2023年第10期188-195,共8页Journal of Plasticity Engineering

基　　金：四川省科技计划重点研发项目2000HP页岩气高压钻井泵研制及应用(2020YFG0260)。

摘　　要：为探究钻井泵原头体裂纹扩展规律,对五缸钻井泵进行裂纹扩展分析。首先,针对泵头体材料进行拉伸、断裂韧度及裂纹扩展速率试验,获得有限元仿真参数;随后,对泵头体进行极限工况下的强度分析及疲劳安全系数分析,获得易发生裂纹的区域;最后,通过改变裂纹形状、尺寸、应力比及温度来探究泵头体的裂纹扩展规律。结果表明,五缸钻井泵泵头体易产生裂纹的区域为右端液压腔相贯线位置处;裂纹尺寸的增加会促进疲劳裂纹的扩展,且初始裂纹的深度对裂纹扩展的促进作用更加显著;增加泵头体的应力比会导致裂纹扩展难度增加,延长寿命;随着温度的增加,初始裂纹扩展加速;以裂纹深度准则进行安全性判断时,R=0.1和R=0.2时寿命分别为146和246 h;以结构面有限性度准则进行安全性判断时R=0.1和R=0.2时寿命分别为101和122 h。To explore the crack growth laws of drilling pump head body,the crack growth analysis of five cylinder drilling pump was carried out.Firstly,the tensile,fracture toughness and crack growth rate tests of pump head body material were carried out to obtain the finite element simulation parameters.Then,the strength analysis and fatigue safety coefficient analysis of pump head body under extreme working conditions were carried out,and the areas prone to cracks were obtained.Finally,the crack growth laws of pump head body were explored by changing shape,size,stress ratio and temperature of crack.The results show that the crack prone area of five cylinder drilling pump head body is the intersection line of the right hydraulic chamber.The increase of crack size promotes the growth of fatigue crack,and the depth of the initial crack promotes the crack growth more significantly.Increasing the stress ratio of pump head body can increase the difficulty of crack growth and prolong the service life.With the increase of temperature,the initial crack growth accelerates.When the crack depth criterion is used to evaluate the safety,the life of R=0.1 and R=0.2 is 146 and 246 h,respectively.When the finiteness criterion of structural plane is used for safety judgment,the life of R=0.1 and R=0.2 is 101 and 122 h,respectively.

关 键 词：钻井泵泵头体 有限元 安全系数 应力强度因子 疲劳裂纹扩展 

分 类 号：TE924[石油与天然气工程—石油机械设备]