Inversion Study on Uniaxial Tensile Fracture of Thin-Walled X80 Circumferential Welded Steel Pipe Based on Fracture Morphology Analysis
摘要
This paper applies fracture morphology analysis to study the fracture behavior of thin-walled X80 circumferential weld steel pipe specimens under uniaxial tensile load. With the support of an optical confocal measurement system, a three-dimensional reconstruction of the fracture was achieved, and the fracture data were quantitatively processed to invert the fracture process. Based on the hypothesis of rectangular rod fracture and the triaxiality of stress, a load quantification model based on dissipative plastic characteristics was established and compared with experiments, with a maximum error of 19.3%. The results indicate that the fracture morphology analysis method is effective in identifying the characteristic regions of the fracture, deducing the inversion of fracture processes, and solving for external loads.