预紧卡箍式快开结构的安全强度分析

Safety strength of preloaded clamp quick-opening structure

在卡箍式快开过滤器设计过程中,预紧后结构的强度是重要的安全校核问题.利用有限元法建立卡箍式快开过滤器的结构模型,在建模过程中针对卡箍、法兰及上、下法兰之间的实际接触状态,模拟在同时施加预紧力和内压情况下,卡箍与法兰及上、下法兰之间的接触状态变化过程.通过分析计算结果,不但获得卡箍式快开过滤器整体结构的压力分布,还获得各接触面上详细的接触压力分布状态即非均匀分布,从而能够按照JB4732-1995对结构危险截面进行较全面的应力强度评定.

The strength of preloaded structure is an important safety issue in the design process of a clamp quick-opening filter.A rational structure model about clamp quick-opening filter was established by finite element method in this paper.For the state of the actual contact among the clamp,the upper and lower flanges in creating model,which is simulated in the situation of preloading and loading inner pressure to the model.Not only is the stress distribution of the overall structure for the clamp quick-opening filter gained through analysing the calculating results,but also the detailed contact stress distribution state on all kinds of contact areas can be obtained.Thus,according to the requirement of JB4732-1995,the stress strength of structure risk section can be assessed.