Elastic-Plastic Finite Element Analysis of an Ultra-High Pressure Tube with Defects under Thermal Shock
Internal-pressure tube with axial crack under thermal shock would generate thermal stresses,which caused the change of the stress field,as well as the change of the plastic extreme internal pressure.The transient temperature and stress fields in an ultrahigh-pressure polythene reactive tube with defects on the outer wall under thermal shock are simulated by the finite element method.Using the extended finite element method,the contour diagram of stress field near the crack tip during the crack propagation process is obtained.The plastic failure pressure obtained only under the internal pressure is compared with that predicted from the PCORRC criterion,to verify the effectiveness of the finite element model and the adopted damage failure criteria.In the thermal-mechanical coupling field,the transient stress of the elements at the crack front and the ultimate pressure of the reaction tube are analyzed.It shows that the transient temperature has a significant impact on the load-bearing capacity of the structure.Moreover,the self-strengthening effect of the inner wall of the tube under the thermal shock makes the reaction tube with external cracks more prone to plastic failure.
thermal shockultrahigh pressure tubeextended finite element methodextreme internal pressure
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