圆柱形腐蚀缺陷相互作用研究

Study on the Interaction of Corrosion Defects in Cylinders

将单圆柱形腐蚀缺陷ANSYS有限元分析和双圆柱形腐蚀缺陷ANSYS有限元分析相结合,首先探讨了单圆柱形腐蚀缺陷破坏机理,其次研究了缺陷间距对单圆柱形和双圆柱形腐蚀缺陷失效压力及等效应力的作用,通过建立双圆柱形缺陷相互作用系数,研究了双圆柱形缺陷相互作用。结果表明:等效应力云图可划分为缺陷中心区域、缺陷附近区域和远离缺陷区域3个部分;随着内压载荷的增加,等效应力逐渐增加;从内壁到外壁,等效应力逐渐增大;对于单圆柱形和双圆柱形腐蚀缺陷,随着腐蚀间距的增大,等效应力逐渐减小,失效压力逐渐增加,单圆柱形腐蚀缺陷出现临界值;随着缺陷间距的增大,相互作用系数在缺陷间距为60 mm时出现波谷,在其他缺陷间距处呈现稳定状态;缺陷深度系数对失效压力的作用很小。

This paper is combining ANSYS finite element analysis of single cylindrical corrosion defects and double cylindrical corrosion defects to study the failure mechanism of single cylindrical corrosion defects.Secondly,the effect of defect spacing on the failure pressure and equivalent stress of single cylindrical corrosion defects and double cylindrical corrosion defects is studied.Through establishing the interaction coefficient of double cylindrical defects,the interaction of double cylindrical defects is studied.The results show that the equal effect force nephogram can be divided into three parts:the middle region of the defect,the region near the defect and the region far away from the defect.With the increase of internal pressure load,the equivalent stress increases gradually.From the inner wall to the outer wall,the equivalent stress increases gradually.For single cylinder and double cylinder corrosion defects,with the increase of corrosion spacing,the equivalent stress decreases gradually,the failure pressure increases gradually,and the single cylinder appears a critical value.With the increase of defect spacing,the interaction coefficient appears a trough when the defect spacing is 60 mm,and the other defect spacing presents a stable state.The effect of defect depth coefficient on failure pressure is very small.