论文部分内容阅读
原顶部凹陷膜片的波纹结构位于膜片球形旋转段下端时,其翻转效率较差,针对这一问题,该文将波纹结构设置到临近顶端凹陷区域。利用有限元法,数值计算原膜片与改进型膜片的屈曲与后屈曲状态。对这两种膜片的研究结果进行对比分析,得出:改进型膜片的屈曲模态更利于膜片翻转,且翻转效率更高;改进型膜片避免了易导致原膜片失效破坏的严重偏心与褶皱问题;改进型膜片的最大应力状态较原膜片有显著降低,可防止膜片在翻转过程中达到材料的极限应力而发生破裂。
When the corrugated structure of the original top concave diaphragm is located at the lower end of the spherical segment of the diaphragm, the turning efficiency of the concave diaphragm is poor. In view of this problem, the corrugated structure is disposed near the concave region near the top. Using finite element method, the buckling and post-buckling state of the original diaphragm and the improved diaphragm were numerically calculated. Comparing and analyzing the results of the two kinds of diaphragms, it is concluded that the buckling mode of the improved diaphragms is more conducive to the reversal of the diaphragms, and the rollover efficiency is higher. The improved diaphragms can avoid the failure of the original diaphragms Severe eccentricity and wrinkle problems; the maximum stress state of the improved diaphragm is significantly lower than that of the original diaphragm, which can prevent the diaphragm from breaking up to the ultimate stress of the material during the overturning.