大容积全多层高压储氢容器封头和筒体连接结构强度研究

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Experimental study has been taken on the strength of the joint structure for the vessel＇s head and reinforce ring which is of the design pressure of 75 MPa and the volume of 2.5 m3. And the stress distribution around the area of the head, reinforce ring and their joint is obtained from experimental study. A finite element analysis model was established to study the deformation characteristics of the joint struc- tures for the head and reinforce ring. Based on this model, the deformation characteristics of the joint structures for the cylinder and the head during over - pressure process, and the stability of the crack tips which is formed by the weld between the head and reinforce ring during cyclic loading process is studied. The results showed that the joint structures is of enough strength, so the empirical design method is fit for the reinforce ring＇s design.以自主研制的75MPa，2．5m3大容积全多层高压储氢容器为对象，开展了封头和简体连接结构强度试验研究，得到了加强箍、封头及其连接部位应力随容器内压力的变化情况。建立了精度较高的大容积全多层高压储氢容器封头和简体连接结构弹塑性有限元分析模型。基于该模型，对封头和简体连接结构在容器超压过程中的变形特征，及封头与加强箍配合面形成裂纹尖端在多次加载时的稳定性进行了分析，验证了加强箍结构设计方法的合理性。