Eventos Anais de eventos
MECSOL 2019
7th International Symposium on Solid Mechanics
The displacement fitting technique to assess Stress Intensity Factors in three-dimensional problems using the Boundary Element Method
Submission Author:
Sérgio Cordeiro , SP
Co-Authors:
Sérgio Cordeiro
Presenter: Sérgio Cordeiro
doi://10.26678/ABCM.MECSOL2019.MSL19-0057
Abstract
This work presents an extension of the Displacement Fitting Technique (DFT) to assess Stress Intensity Factors (SIF) in three-dimensional linear elastic fracture mechanics problems using the Boundary Element Method (BEM). The displacement fitting scheme developed in the present study accounts for higher order terms of the asymptotic near crack front William´s solution. Thus, it results more accurate than first order displacement based SIF assessment techniques. Besides, BEM formulations are well-known to be accurate for the evaluation of physical quantities with high gradients, such as the near crack front displacement fields. Due to the lack of domain discretizations provided by the BEM, the number and location of the internal near crack front points for displacement evaluation can be arbitrarily chosen. In the present work, the accuracy of the SIF results is studied with respect to the number and location of these evaluations points. Two three-dimensional crack problems with both analytical and numerical SIF solutions were utilized to study the performance of the DFT.
Keywords
Stress intensity factors, Displacement fitting technique, Boundary Element Method
