补强圈与容器壳体间的接触行为

Contact behavior between vessel shell and reinforcement pad

在压力容器开孔补强的薄壳理论分析中 ,通常假设在补强圈与容器壳体之间没有接触 ,其间的接触力对于结构应力分布的意义和影响尚不清楚。由有限元分析得出的应力分析结果 ,其中就包括了这种接触力。有限元结果与试验数据的比较表明有接触假设的有限元方法 ,对于应力场分布能够产生更好的理论预测。

In the thin shell analysis of welded pad reinforced nozzles in pressure vessels, no contact between pad and vessel is often assumed. The significance of this contact force to the stress distribution in the structure is little known. In this paper, stress results from the finite element analysis, which includes the contact force between the pad and the vessel, were reported. A comparison of the finite element results with those experiments shows that the finite element method with contact assumption yields improved theoretical prediction for the stress distribution. The effect of the gap between the pad and the vessel, as well as the effect of the varity of d/D to the contact were also investigated.