蓄能器壳体的塑性极限载荷和失效分析  

Plastic Limit Load and Failure of Accumulator Shell

作　　者：蔡鹏辉 李靖琳 沈正祥 翟彬彬 吴彩保 黄焕东 宋鹏飞 CAI Penghui;LI Jinglin;SHEN Zhengxiang;ZHAI Binbin;WU Caibao;HUANG Huandong;SONG Pengfei(Ningbo Special Equipment Inspection&Research Institute,Ningbo 315048,Zhejiang,China;College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310014,Zhejiang,China;Faculty of Mechanical Engineering and Mechanics,Ningbo University,Ningbo 315211,Zhejiang,China)

机构地区：[1]宁波市特种设备检验研究院,浙江宁波315048 [2]浙江工业大学机械工程学院,浙江杭州310014 [3]宁波大学机械工程与力学学院,浙江宁波315211

出　　处：《高压物理学报》2022年第3期118-125,共8页Chinese Journal of High Pressure Physics

基　　金：浙江省基础公益研究计划(LGF21E040003);浙江省市场监督管理局科研计划(20190330);宁波市质量技术监督局科技项目(2019)。

摘　　要：结构完整性是液压蓄能器设计制造的重要依据,为确定内压作用下某蓄能器壳体的最大承载能力,采用弹塑性理论分析、数值仿真与试验研究相结合的方法,对壳体塑性极限载荷和失效位置进行研究。结果显示:由于未考虑壁厚的影响,理想弹塑性分析结果明显偏高;尽管忽略了应变强化效应,但是通过荷载因子逐步加载,非线性有限元仿真得出的极限载荷仍然比较接近爆破试验实测值,误差仅为3.5%,并且预测的塑性失效位置与实际破口部位基本一致,说明非线性有限元Risk法能够获得更符合实际的结果,可用于简单薄壁压力容器的分析设计。Structural integrity is an important basis for the design and manufacture of hydraulic accumulator.In order to determine the maximum bearing capacity of an accumulator shell under internal pressure,the plastic limit load and failure location of the shell are studied based on elasto-plastic analysis,numerical simulation and experiments.The results show that the perfect elasto-plastic analysis is obviously higher due to the lack of consideration of the wall thickness.Although the strain strengthening effect is ignored,the calculation result of nonlinear finite element method using step-by-step iteration of load factor is very close to the measured value of the blasting test with an error of only 3.5%,and the predicted plastic failure is consistent with the actual fracture.It shows that the Risk method is more accurate and can be used for the analysis and design of simple thin-walled pressure vessels.

关 键 词：蓄能器 塑性 极限载荷 非线性有限元 爆破 

分 类 号：O347.3[理学—固体力学] TQ053.2[理学—力学]