Characteristic-tensor method for efficient estimation of stress-intensity factors of three-dimensional cracks. (November 2021)

• Record Type: Journal Article
• Authors: Saito, Kei; Hirashima, Tei; Ma, Ninshu; Murakawa, Hidekazu
• Is Part Of: Engineering fracture mechanics. Volume 257(2021)
• Publication Date: 2021-11
• Subjects: Characteristic tensor -- Stress intensity factor -- Three-dimensional crack; Fracture mechanics -- Periodicals; Rupture, Mécanique de la -- Périodiques; Fracture mechanics; Periodicals; 620.112605
• DOI: 10.1016/j.engfracmech.2021.108016
• Languages: English
• ISSNs: 0013-7944

Abstract

Highlights: The characteristic tensor is can describe the stress singularity around cracks at complex loading conditions. The characteristic tensor method can simply and accurately predict SIFs of three-dimensional cracks with coarse mesh. The characteristic tensor method can facilitate detailed crack propagation analyses with coarse mesh. Abstract: A practically simple characteristic-tensor method (CTM) is proposed for evaluation of the stress state at crack tips subjected to arbitrary loading conditions. Stress-intensity factors (SIFs) in several representative types of three-dimensional cracks (such as the circular crack, elliptical crack, and inclined circular crack) were computed by the finite-element method. Even using a relatively coarse mesh, SIFs for mixed-mode crack problems could be estimated by the CTM with high accuracy. The results show that the CTM is a practical and reliable approach to the estimation of SIFs of 3D cracks that are important to the industrial application.