Fracture mechanics investigation of crack coalescence in a steel tubular T-joint specimen

Tanaka Satoyuki

Thin Thin Htut

Maeda Kengo

Yagi Kazuhisa

Osawa Naoki

Engineering Failure Analysis

Fatigue test of steel tubular T-joint specimens was performed. A beach mark (BM) technique was employed to measure the crack size. Some rare fracture patterns were found. One of the specimens generated two major surface cracks around the weld toe. They were independently propagating at the initial stages and were coalesced into a single surface crack at a certain amount of cyclic loads. Subsequently, the crack was enlarged and became a doubly curved surface crack. Crack propagation (CP) simulation is performed to investigate the fracture behaviors. Extended finite element method (X-FEM) option in an open-source software Code_Aster is used. FEM CP simulation is also performed to validate the X-FEM results. The CP phenomena are carefully examined using the fracture mechanics parameters and crack front trajectories.

Steel tubular T-joint

Crack propagation simulation

X-FEM

Fatigue test

eng

Elsevier

© <2022>. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/

This is not the published version. Please cite only the published version.

この論文は出版社版ではありません。引用の際には出版社版をご確認、ご利用ください。

[DOI] https://doi.org/10.1016/j.engfailanal.2022.106504 isVersionOf