应变强化奥氏体不锈钢液态二氧化碳储罐强度裕度研究  

Research on Strength Margin of Pressure Strengthened Liquid Carbon Dioxide Pressure Vessels

作　　者：李青青[1] 郑津洋[1,2,3] 张潇[1] 缪存坚[1] 高晓哲[1] 马利[1] 

机构地区：[1]浙江大学化工机械研究所,浙江杭州310027 [2]浙江大学高压过程装备与安全教育部工程研究中心,浙江杭州310027 [3]浙江大学流体动力与机电系统国家重点实验室,浙江杭州310027

出　　处：《轻工机械》2015年第5期29-33,共5页Light Industry Machinery

基　　金：中国博士后科学基金(2014M551731)

摘　　要：应变强化是一种有效实现低温容器轻量化的技术,应变强化和低温是保证容器强化效果的重要因素,也是保障容器强度裕度的关键。奥氏体不锈钢液态二氧化碳储罐的设计温度通常为-40℃,该温度下材料的强化效果较弱,目前国内暂时未推广应变强化技术在其中的应用。文章在-40℃材料力学性能试验基础上,应用数值仿真对应变强化液态二氧化碳储罐的强度裕度进行了研究,并结合标准分析了该应变强化储罐的安全性,结果表明应变强化奥氏体不锈钢液态二氧化碳储罐其爆破压力与设计压力比值为3.64,仍然具有较高的强度裕度。Pressure strengthening technique is a valid lightweight method in cryogenic vessel production. In this technique, prestrain and low temperature are two important factors to achieve strengthening effect, and also the keys to guarantee the strength margin. The design temperature of austenitic stainless steel pressure vessels for liquid carbon dioxide （LCO2 ） is generally -40℃, which may lead to less improvement in strengthening effectiveness and lower strength margin. Currently the technique has not yet been widely promoted in pressure strengthened LCO2 pressure vessels in domestic. To study the structure strength of pressure strengthened LCO2pressure vessels, the strength margin of vessels was calculated by using finite element method based on material test results at - 40℃, and the result was compared with the codes. It was found that, the pressure strengthened LCO2 pressure vessels whose ratio of plastic collapse pressure to the design pressure was 3.64 still had sufficient strength margin.

关 键 词：低温容器 应变强化 轻量化 液态二氧化碳 强度裕度 

分 类 号：TH123.3[机械工程—机械设计及理论]