A combined experimental and numerical analysis of fracture and crack growth in SMAs is presented. Crack extension is investigated under mode-I, isothermal, monotonic, mechanical loading in near-equiatomic nickel- titanium (NiTi) SMA compact tension (CT) specimens. Stable crack growth is observed and the associated J-R curve is evaluated along with the crack initiation toughness. Finite element analysis (FEA) with an energetics based fracture toughness criterion is also carried out and crack is assumed to extend when crack-tip energy release rate reaches the material specific critical value. Fracture toughening behavior is observed during crack growth and is mainly associated with the energy dissipated by the progressively occurring phase transformation close to the moving crack tip. A comparison between the experimental and numerical results is presented.
Behrouz Haghgouyan, Sameer Jape, Ceylan Hayrettin, Theocharis Baxevanis, Ibrahim Karaman, and Dimitris C. Lagoudas, "Experimental and numerical investigation of the stable crack growth regime under pseudoelastic loading in shape memory alloys," Proc. SPIE 10596, Behavior and Mechanics of Multifunctional Materials and Composites XII, 1059612 (Presented at SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring: March 07, 2018; Published: 22 March 2018); https://doi.org/10.1117/12.2300902.
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