Application of the J´-integral and the cohesive approach for the creep crack modelling

Application of the J´-integral and the cohesive approach for the creep crack modelling

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The subject of theoretical and experimental attention is the propagation of a macroscopic crack during the creep of austenitic steel, AISI 304L. To obtain input data, experiments were performed on bodies with and without a priori crack at a temperature of 973 K. A weak primary stage area is followed by an extensive area of stationary creep, as is shown. Propagation of the magistral crack occurred in a short interval defining the tertiary stage of life. A metallographic study of crack development showed cavitation failure along fracture path, intercrystalline damage was dominant. The description of the behaviour of a body with a dimensional defect (a priori crack) is monitored during high-temperature creep using a cohesive approach and implemented with help of cohesive elements in the finite element method (FEM). The parameter controlling the crack growth is the J˙ integral, the obtained results are compared with the experiments.

The subject of theoretical and experimental attention is the propagation of a macroscopic crack during the creep of austenitic steel, AISI 304L. To obtain input data, experiments were performed on bodies with and without a priori crack at a temperature of 973 K. A weak primary stage area is followed by an extensive area of stationary creep, as is shown. Propagation of the magistral crack occurred in a short interval defining the tertiary stage of life. A metallographic study of crack development showed cavitation failure along fracture path, intercrystalline damage was dominant. The description of the behaviour of a body with a dimensional defect (a priori crack) is monitored during high-temperature creep using a cohesive approach and implemented with help of cohesive elements in the finite element method (FEM). The parameter controlling the crack growth is the J˙ integral, the obtained results are compared with the experiments.

crack initiation and detection; finite-element analysis

crack initiation and detection; finite-element analysis

KOZÁK, V.

15.09.2025

AIIP

Melville (USA)

INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS: ICNAAM 2023

AIP conference proceedings

Spojené státy americké

260006-1

260006-4

4

https://pubs.aip.org/aip/acp/article/3315/1/260006/3363088/Application-of-the-J-integral-and-the-cohesive