钢制冷挤压斜三通的失效压力分析

Failure pressure analysis of steel cold extrusion skew tee

冷挤压斜三通在工厂内一次成型,无需现场预制,应力集中效应相对较小。作为非标准件的斜三通,没有现成的设计计算公式。为了确定冷挤压斜三通的设计压力,首先对冷挤压斜三通进行水压爆破试验,绘制压力-升压时间曲线,从而得到一次、二次局部屈服压力范围;其次结合有限元法,采用三维实体建模,模拟水压爆破试验工况边界条件,选取最大Von Mises应力点和小圆角处的局部应力集中区作为准危险截面,通过定义分析路径进行结构应力分类评定。

The cold extrusion skew tee is formed in factory in one time,the prefabrication on jobsite is not needed,and the stress concentration effect is relatively small.Skew tee as a non-standard part,there are no ready-made design and calculation formulas for it.Therefore,the hydraulic blasting test was carried out on the cold extrusion skew tee,the pressure-time curve was drawn to obtain the primary and secondary local yield pressure ranges.Combined with the finite element method,the 3D solid model was built,and the boundary conditions of the hydraulic blasting test were simulated,the maximum Von Misses stress point and the local stress concentration area at the small fillet were selected as the quasi dangerous cross-section,then the analysis path was defined for the structural stress classification analysis and assessment.