Research on the ultimate bearing capacity of high-strength steel elbows with pitting defects
In the process of oil and gas pipeline transportation,elbows are more prone to corrosion compared to straight pipes due to the factors such as load and corrosive media.This article takes pit-ting defects as the research object.A three-dimensional(3 D)nonlinear finite element(FE)model of elbows with pitting defects was established.It further analyzes the influence of factors such as the rel-ative position of defects,the geometric size of defects,and the material properties of elbows.The re-search results indicate that the ultimate internal pressure of the elbow with pitting defects is influenced by the relative position of the defects.When the defects are located at the inner arch of the elbow,the ultimate internal pressure of the elbow is the smallest.Moreover,the ultimate internal pressure of the elbow with pitting defects is also affected by the size of the defect.The ultimate internal pressure de-creases with increase of the depth of the pitting defects and the radius of the pitting defects.Sensitive factors such as pipeline size,pipeline bending radius,and material properties can also have an impact on the ultimate internal pressure of pipelines.Therefore,the conclusions obtained have certain refer-ence value for the safety assessment of elbows with pitting defects.
pitting defectselbowsultimate internal pressurefinite element analysisequivalent stress
万方数据
维普
