有限元分析不同形状腐蚀坑水冷壁管的剩余强度

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。

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

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 10 H-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 6 H-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 .