摘要
介绍了两半环式卡箍快开釜的平盖、卡箍、筒体端部的设计方法，对采用GB150．3附录C．7卡箍紧固结构的计算和有限元计算结果进行比较，两种计算方法的结果差距较大，各部件卡紧环根部环向截面第三、第四当量应力，按附录c．7计算值仅是有限元的51％～56％，原因是该截面剪切应力并非均匀分布，有约等于2的应力集中系数。卡箍、筒体端部卡紧环根部横截面第三、第四当量应力，按附录C．7计算值是有限元的1．41～1．96倍，原因是该处应力属三向受拉区，第三、第四当量应力远小于轴向应力，应校核其三向主应力之和小于4倍设计应力强度，防止脆性断裂。卡箍快开釜属疲劳容器，平盖、卡箍、简体端部卡紧环根部均有较高的应力集中，应是圆弧过渡，其圆弧半径的确定是疲劳容器设计的重点之一，并研究了过渡圆弧半径对危险截面当量应力的影响，及过渡圆弧半径与应力集中系数的关系。
A fast open reactor design methods which involves flat cover, clamp and the end of cylinder were introduced. Comparing the results of GB 150 appendix C. 7 and finite element method （ FEM ）, it shows great differences between them. As for the third and forth equivalent stress at the end of clamp ring section,calculation based on appendix C. 7 accounts for 51% -56% of FEM,which errors from inhomo- geneous distribution of cross section shear stress, approximately the stress concentration factor is 2. In terms of the third and forth equivalent stress at the end of clamp and cylinder section, calculation in ac- cordance with appendix C. 7 accounts for 1.41 -1.96 times of FEM,the reason is stress in three dimen- sional tension, the third and forth equivalent stress is much less than axial stress. The sum of three princi- pal stress should less than quadruple design stress intensity values to prevent brittle fracture. Clamp fast open reactor belongs to fatigue vessel, in order to prevent stress concentration that exists in flat cover, clamp, end of cylinder, transition arc should be applied, transition arc radius will be one of the crucial factors in fatigue vessel design. This paper investigates the effect of transition radius on the critical section equivalent stress and the relationship between transition arc radius and stress concentration factor.
出处
《压力容器》
2016年第6期18-25,共8页
Pressure Vessel Technology
关键词
卡箍式快开釜
平盖
卡箍
筒体端部
有限元
第三、第四当量应力
clamp fast open reactor
flat cover
clamp
end of cylinder
finite element method
the third and forth equivalent stress
