固井压裂用TH泵泵头体有限元分析及材质选用

针对固井压裂泵泵头体的开裂失效问题 ,运用弹性力学有限元法 ,利用Pro/ME CHANICA软件对TH泵泵头体进行了有限元分析计算 ,获得其内腔的应力大小和应力幅分布规律。计算得到TH泵泵头体在使用工况下内腔的合成应力Δσ =2 90MPa。由此确定TH泵泵头材料为 34CrMo4A。该材料经调质处理后 ,得到稳定的综合机械性能 :拉抗强度σb≥ 85 0MPa ,屈服强度σs≥ 6 5 0MPa ,延伸率δmin≥ 10 % ,断面收缩率 ψ纵 ≥ 4 5 % ,ψ横 ≥ 32 % ,常温冲击值αkv(2 0℃ )≥ 32J ,低温冲击值αkv (- 2 0℃ )≥ 2 1J ,布氏硬度 2 70～ 312HB ,满足TH泵泵头体使用要求。

Finite element analysis and material selection of fluid cylinders of TH fracturing pump

In the light of the cracking of the fluid cylinders of TH fracturing pump, by using the elastic mechanical finite element method, the fluid cylinders are analysis and calculation is made. The stress value and the stress distribution laws of the inner cavity fothe TH fluid cylinder are obtained. Based on the maximum composite stress of TH fluid cylinder under working condition, the mechanical characteristic of the cyliner can be determined and reasonable material can be selected.