Geometry parameter method to estimate stress intensity in V-notched plate and a small crack ahead from V-notch apex. (September 2020)

• Record Type: Journal Article
• Authors: Lou, Benqiang; Barltrop, Nigel; Zhang, Jian
• Is Part Of: Thin-walled structures. Volume 154(2020)
• Publication Date: 2020-09
• Subjects: Linear elastic fracture mechanics -- V-notch -- Stress intensity factor -- Finite element method -- Geometry parameter method; Thin-walled structures -- Periodicals; 690.1
• DOI: 10.1016/j.tws.2020.106801
• Languages: English
• ISSNs: 0263-8231

Abstract

Abstract: An approximate, universal approach called the geometry parameter method is developed to estimate the stress intensity factor (SIF) and notch SIF (NSIF) according to linear elastic fracture mechanics (LEFM). NSIF solutions for sharp V-notches include correction coefficients for edge and central notches. The obtained results agree well with results for a double and central V-notched rectangular plate. Furthermore, explicit closed-form solutions are obtained using the proposed method for small crack ahead from a V-notch, and a reliable finite element model is described to calculate crack SIFs in V-notches under mixed loadings. The proposed method is robust and convenient for engineering applications. Highlights: An universal geometry method is proposed for stress intensity estimations. Explicit approximate solutions of λ1 and F11 are developed and validated. NSIF results are verified for 2D DENT and extended to calculate central V-notched plate. Explicit closed-form solutions are obtained for a small crack ahead from V-notch apex. Reliable FEM meshed calculation is performed and verified for crack SIF.