有限元分析不同形状腐蚀坑水冷壁管的剩余强度

Finite Element Analysis of the Remnant Strength of the Water-cooled Wall Tubes with Different Corrosion Pit Shapes

基于ANSYS有限元软件,对含不同形状腐蚀坑水冷壁管剩余强度进行了研究。研究表明,将管壁上腐蚀坑简化为柱状,当腐蚀坑直径和腐蚀深度组合达到?5 mm-80%壁厚、?8 mm-70%壁厚、?12 mm-60%壁厚3种情况时,腐蚀坑直径和腐蚀深度增加则可认为腐蚀区失效;将腐蚀坑简化为球形,当腐蚀坑直径和腐蚀深度达到10H-70%壁厚(H为腐蚀深度)时,腐蚀坑直径或深度增加则可认为腐蚀区域失效;将腐蚀坑简化为矩形,当腐蚀坑尺寸和腐蚀深度达到6H-60%壁厚时,腐蚀深度和尺寸增加会造成腐蚀区域失效。相同尺寸和腐蚀深度的柱形坑、球形坑和矩形坑,球形坑最安全,柱形腐蚀坑最容易失效。

ANSYS software is applied to analyze the remnant strength of the water- cooled wall tube with different corrosion pit shapes. The research results show that with cylinder corrosion pits,when the corrosion diameter and corrosion depth reaches ？5 mm- 80% wall thickness,？8 mm- 70% wall thickness and ？12 mm- 60% wall thickness,the tube can be thought of failure; with sphere corrosion pits,when the corrosion diameter and corrosion depth reaches 10H- 70% wall thickness（ H is the corrosion depth）,the tube can be thought of failure; with rectangle corrosion pits,when the corrosion diameter and corrosion depth reaches 6H- 60% wall thickness,the tube can be considered as failure; under the same size and corrosion depths of cylinder,sphere and rectangle corrosion pits,the tube with sphere pits is the safest and that with cylinder pits is most likely to fail.