On the Calculation of Stress Intensity Factors and J-Integrals Using the Submodeling Technique

Abstract

In the present paper, calculations of the stress intensity factor (SIF) in the linear-elastic range and the J-integral in the elastoplastic domain of cracked structural components are performed by using the shell-to-solid submodeling technique to improve both the computational efficiency and accuracy. In order to validate the submodeling technique, several numerical examples are analyzed. The influence of the choice of the submodel size on the SIF and the J-integral results is investigated. Detailed finite element solutions for elastic and fully plastic J-integral values are obtained for an axially cracked thick-walled pipe under internal pressure. These values are then combined, using the General Electric/Electric Power Research Institute method and the reference stress method, to obtain approximate values of the J-integral at all load levels up to the limit load. The newly developed analytical approximation of the reference pressure for thick-walled pipes with external axial surface cracks is applicable to a wide range of crack dimensions.

Engineering critical assessment for offshore pipelines with 3-D elliptical embedded cracks

“…However, few literatures have focused on the nonlinear elastic-plastic fracture mechanics [25]. In this paper, the submodeling capacity has been employed to investigate the fracture response of the pipeline girth weld with an embedded crack under large bending moment.…”

“…(8) is solved, i.e. the stress intensity factor K I is obtained, the applied CTOD (d I ) can be obtained from the classical formulas [25] given as follows…”

Numerical Analysis of Longitudinal Residual Stresses and Deflections in a T-joint Welded Structure Using a Local Preheating Technique

“…A finite element mesh containing 19,188 elements is shown in Figure 5. Its sensitivity was checked on a small part of the T-joint with a very high density using the submodeling technique [36]. The dimensions of the submodel and volume of submodeling are given in Figure 1.…”

Failure resistance of drilling rig casing pipes with an axial crack

“…Many recent investigations, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20], have dealt with the analysis of the deformation behaviour, failure, integrity assessment and remaining service life of pipelines. Fracture parameters for the pipes with cracks are analysed in [1][2][3][4][5].…”

“…Fracture parameters for the pipes with cracks are analysed in [1][2][3][4][5]. Most of the studies from the literature deal with conditions for fracture initiation, i.e.…”