Plastic Limit Loads of 90° Elbows with Local Wall Thinning using Small Strain FE Limit Analyses (I) - Internal Pressure -

Limit Load Analysis of Elbow with Local Wall Thinning under Combined Loads

“…At present, theory and experiment studies on the limit load of elbows with LTA under pressure and bending moment are more, but studies on torque are few. Zhixiang Duan et al [5,6] studied the relationship between the limit load and defect sizes through finite element calculation and using orthogonal test when elbows were under internal pressure or in-plane closing bending moment, however, the torque and destruction location of elbows with LTA haven't been taken consideration. This paper made up for his shortcomings and replenished torque and the influence of multi-load on destruction location of elbows.…”

“…Gang Chen et al [4] used numerical simulation method to study limit load of LWT elbow under internal pressure and in-plane bending moment, analyzed the impact on load capacity of elbow from aspects of combined loads, defective size, position and elbow size, and discussed the typical failure mode. Zhixiang Duan et al [5,6] employed finite element and experimental verification, did some researches of limit load of elbows with LWT in extrados under the combined effects of internal pressure and bending moment, and acquired the safety assessment method of elbows with LWT under this load condition. Huimin Zhang et al [7,8] through nonlinear finite element analysis, acquired the limit load of elbows with volume defects under the effects of internal pressure, in plane bending moment, out-of-plane bending moment and torque and did a systematic analysis of geometric parameters connected with volume defects and pipelines.…”