Crack-tip field characterization of crack-tip opening angle-based crack growth — plane strain single-edge cracked specimen subject to pure extension

• Published in: Journal of mechanical science and technology Vol. 25; no. 5; pp. 1207 - 1213
• Main Authors: Jung, Sunghwan, Lee, Hyungyil
• Format: Journal Article
• Language: English
• Published: Heidelberg Korean Society of Mechanical Engineers 01.05.2011; Springer Nature B.V; 대한기계학회
• Subjects: Control; Crack propagation; Criteria; Dynamical Systems; Engineering; Exact sciences and technology; Finite element method; Fracture mechanics; Fracture mechanics (crack, fatigue, damage...); Fundamental areas of phenomenology (including applications); Industrial and Production Engineering; Inelasticity (thermoplasticity, viscoplasticity...); Mathematical models; Mechanical Engineering; Physics; Plane strain; Plastic cracks; Slip line fields; Solid mechanics; Structural and continuum mechanics; Vibration; 기계공학; Slip line field; Fully plastic crack growth; Pure extension; Backface configuration; Plane strain; Triaxiality; Single-edge cracked specimen; Nodal release technique; FEM; Crack-tip opening angle (CTOA); Deformation band; Slip line; Fracture criterion; Modeling; Crack―tip opening angle (CTOA); Edge crack; Crack propagation; Finite element method; Inelasticity; Elastoplasticity; Precracked specimen; Crack tip; Shear band
• ISSN: 1738-494X; 1976-3824
• DOI: 10.1007/s12206-011-0226-1

The objective of this work is to study the crack-tip field of plane strain fully plastic crack growth of a single-edge cracked specimen subject to pure extension. The nodal release technique [1] was implemented into an FEM model so that the nodes arranged in the crack path are released. The fracture criterion for the crack growth in the model adopts the loading geometry-based crack-tip opening angle-(CTOA) proposed in the work of Ref. [2]. The crack-tip field from the CTOA-based crack growth was investigated and characterized with a slip line field. It was observed that the backface configuration of the specimen, which evolves with the crack growth, is engaged in the formation of the shear band and, as a result, significantly elevates the triaxiality at the crack-tip during the crack growth.