组合式爆炸容器振动特性与破坏模式分析

Vibration Characteristic and Destroyed Modes Analysis of Assembled Explosion Vessel

从分析载荷的频谱特征入手 ,通过有限元模态分析与实验结果的对比 ,对容器壳体可能的破坏模式进行了分析 ,给出了由爆炸容器的薄弱模态作为判定其壳体结构破坏主要模式的方法 ,为预估组合式爆炸容器的破坏模式作了一些探索。研究表明容器壳体结构的薄弱模态与激励载荷的频谱特性有关。对爆炸容器壳体的振动特性分析不仅可以确定其主要振型 ,而且可以得到不同位置的应力相对量 ,进而估计出可能的破坏区域和薄弱环节 。

This paper studies the vibration characteristics of the explosion vessel, which is composed of a cylindrical shell and ellipsoidal closures experimentally. It presents the method to judge the shell's main destroyed modes by the weak mode. The vibration and main destroyed modes are studied by several approaches. The frequency spectrum characteristics of explosion loading are analyzed, the frequency spectrum and the trend analysis on the load of the combined explosion vessel is obtained experimentally. Using the finite-element method to analysis the main vibration modes corresponding to the main vibration frequencies are obtained by experiments. Theory analysis and experiment data indicated: Impulse characteristic emerges under internal blast loading in closed vessel. With the increase of internal blast loading, shells' dominant frequency will be inclined to breathing frequency; the strain growth will be declined.