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Stress resultant intensity factors evaluation of cracked folded structures by 6DOFs flat shell meshfree modeling
Abstract Several numerical examples for cracked folded structures are analyzed to investigate the mixed-mode stress resultant intensity factors (SRIFs). The kinematic formulations of structures are derived by the first order shear deformation plate theory. A Galerkin meshfree six degrees of freedom (6DOFs) flat shell is employed, in which the reproducing kernel (RK) is used as the meshfree interpolant. A diffraction method, visibility criterion and enriched basis are introduced to model the through crack. J-integral is evaluated based on the stress resultants and is decomposed into the symmetric and asymmetric parts for extracting the mixed-mode SRIFs. Not only the stiffness matrix but also the J-integral are discretized by nodes. They are numerically integrated by the stabilized conforming nodal integration (SCNI) and the sub-domain stabilized conforming integration (SSCI) techniques. The effectiveness of the meshfree modeling and accuracy in the SRIFs are discussed.
Highlights Cracked folded structures are analyzed using meshfree method. SCNI/SSCI are used in the crack modeling based on RKPM meshfree method. High accuracy SRIFs and path-independency are obtained.
Stress resultant intensity factors evaluation of cracked folded structures by 6DOFs flat shell meshfree modeling
Abstract Several numerical examples for cracked folded structures are analyzed to investigate the mixed-mode stress resultant intensity factors (SRIFs). The kinematic formulations of structures are derived by the first order shear deformation plate theory. A Galerkin meshfree six degrees of freedom (6DOFs) flat shell is employed, in which the reproducing kernel (RK) is used as the meshfree interpolant. A diffraction method, visibility criterion and enriched basis are introduced to model the through crack. J-integral is evaluated based on the stress resultants and is decomposed into the symmetric and asymmetric parts for extracting the mixed-mode SRIFs. Not only the stiffness matrix but also the J-integral are discretized by nodes. They are numerically integrated by the stabilized conforming nodal integration (SCNI) and the sub-domain stabilized conforming integration (SSCI) techniques. The effectiveness of the meshfree modeling and accuracy in the SRIFs are discussed.
Highlights Cracked folded structures are analyzed using meshfree method. SCNI/SSCI are used in the crack modeling based on RKPM meshfree method. High accuracy SRIFs and path-independency are obtained.
Stress resultant intensity factors evaluation of cracked folded structures by 6DOFs flat shell meshfree modeling
Tanaka, S. (author) / Dai, M.J. (author) / Sadamoto, S. (author) / Yu, T.T. (author) / Bui, T.Q. (author)
Thin-Walled Structures ; 144
2019-07-03
Article (Journal)
Electronic Resource
English
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