搪玻璃设备许用应力的探讨.pdf

设计计算
搪玻璃设备许用应力的探讨
雍兆铭',刘宝庆2,戴林宮',夏晓波,潘俊杰
(1.江苏省溧阳市云龙设备制造有限公司,江苏溧阳213311;2.浙江大学化工机械研究所,浙江
杭州310027)
摘要:搪玻璃层是搪玻癆设备的强度薄弱环节,但现有设计大都仅考虑了金属基体的强度,对搪玻
璃层的强度没有关注。结合搪玻璃设备制造和运行中常常出现的裂纹或爆瓷等现象,借助有限元
分析法和破坏性试验测试,初步探讨了搪玻璃设备的许用应力。结果表明,単纯依靠金属基体的总
体薄膜应力进行搪玻璃设备的强度校核并不能确保搪玻璃层的安全,还必须考虑搪玻璃层的最大
主应力。一般搪玻璃层的最大主应力出现在与金属基体最大主应力相同的位置,且搪玻璃层的最
大主应カ略高于金属基体的总体薄膜应力。故实际设计中必须同时兼顾金属基体和搪玻璃层的强
度,并取1.2~1.5倍的金属基体总体薄膜应カ作为搪玻璃层的最大主应力进行校核为宜,同时对
设备高应力区还有必要通过结构优化来降低金属基体与搪玻璃层的应カ水平。
关键词;搪玻璃设备;搪玻璃层;主应力;许用应力
中图分类号:TH49;TQ173文献标识码:A文章编号:1001-4837(2012)11-0030-04
doi:10.3969/j,isna.1001-4837.2012.11.006
Discussion of Allowable Stress of Glass -lined Equipment
YONG Zhao -ming U Bao-qin, DA Lin-fu ,XA Xiao-bo, PAN Jun-jie
1. Jiangsu Liyang Yunlong Equipment Manufacting Co, Ltd. Liyang 213311, China; 2. Institute of
Chemical Machinery Engineering, Zhejiang University, Hangzhou 310027, China)
Abstract: As the weak link of the strength of glass-lined equipment, glass-lined coating is not given
more attention to during the design of glass-lined equipment. Combined with the failure phenomenon of
glass-lined equipment appearing in the manufacturing and operating process, with the help of finite ele-
ment method and destructive test, the allowable stress of glass-lined equipment was discussed prelimina
ry. The result indicates that the strength check based on the single primary membrane stress can not guar-
antee the safety of glass-lined equipment and the maximum principle stress of glass-lined coating
should also be taken into consideration. Usually the maximum principle stress of glass-lined coating ap-
bears at the same position as the global membrane stress of metal base and is slightly higher than the glob
al membrane stress of metal base. Therefore, the strength of both metal base and glass-lined coating
should be considered and 1 2 1. 5 times of global membrane stress can be chosen as the maximum prin
ciple stress of glass-lined coating to check its strength. Meanwhile, the structure of the zone with high
stress can also be optimized to decrease the stress level of metal base and glass-lined coating
Key words: glass-lined equipment; glass-lined coating; principle stress; allowable stress