Research on Buckling Failure Mechanism and Critical Load of Bimetallic Composite Pipe
In order to investigate the buckling failure mechanism of bimetallic composite pipe,the ABAQUS software was used to build a finite element model of it.Then,considering the existence of residual stresses during forming,the variation laws of bending moment,ellipticity and inner lining wrinkling amplitude with curvature dur-ing the bending process were analyzed.Finally,the influence of yield strength and radius-thickness ratio of inner lining pipe as well as the radius-thickness ratio of outer base pipe on the buckling failure of bimetallic composite pipe was studied,and the prediction formulas for critical bending moment and critical curvature were further pres-ented.The analysis results show that the inner lining pipe with higher yield strength can increase the critical ben-ding moment of the composite pipe,but will reduce the critical curvature of it.Smaller radius-thickness ratios of inner lining pipe and outer base pipe all can increase the critical bending moment and critical curvature of the com-posite pipe.Compared to the critical bending moment,the changes in the yield strength and radius-thickness ratio of the inner lining pipe have a more obvious influence on the critical curvature,while the changes in the radius-thickness ratio of the outer base pipe have a very obvious influence on both of them.The relative errors between the predicted results of the critical bending moment and critical curvature formulas and the finite element calculation re-sults do not exceed 4%and 12%respectively.The conclusions provide a reference for the design and safety evalu-ation of bimetallic composite pipe.
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