￠138超高压釜体螺纹联接处的强度分析

STRENGTH ANALYSIS OF SCREWTHREAD CONTACT FORφ138 SUPER-PRESSURE CYLINDE BODY

用有限元混合法对φ１３８超高压釜体的热接触应力进行厂综合分析。所用数学模型把确定接触力的大量迭代计算凝缩到少数螺纹牙齿接触点上执行，避免了原方程的多次形成和求解，大大提高了计算速度，减少了计算量，通过引用伪弹簧解决了总刚度矩阵奇异性问题。两年来多次射孔爆炸试验证明理论分析结果正确，釜体安全可靠。

In this paper the thermal elastic contact stress under a super-high pressure cylinder body in a perforation simulating device is carried out by the mixed-method of finite-element.The mathematical model to be used in the paper can reduce the iteration processes in calculating contact forces to the calculation of a few screwthread contact points,which may avoid the generation and solution of initial equations for many times and greatly increase the calcula-tion speed.Also,a virtual-springs may be used to solve the singular problem of global stiff- ness matrix.The device has been tested with perforation explosion experiments for many times over the last two years, which shows that the results of the theoretical analysis is cor-rect and the body may work safety and reliably.