Fracture toughness of martensitic NiTiHf high-temperature shape memory alloy

B. Haghgouyan; B. Young; I. Karaman; D. C. Lagoudas

doi:10.1117/12.2514432

29 March 2019 Fracture toughness of martensitic NiTiHf high-temperature shape memory alloy

B. Haghgouyan, B. Young, I. Karaman, D. C. Lagoudas

Proceedings Volume 10968, Behavior and Mechanics of Multifunctional Materials XIII; 109680A (2019) https://doi.org/10.1117/12.2514432
Event: SPIE Smart Structures + Nondestructive Evaluation, 2019, Denver, Colorado, United States

Abstract

Fracture behavior of a martensitic Ni_50.3Ti_29.7Hf₂₀ (at.%) high-temperature shape memory alloy (SMA) under mode-I nominally isothermal loading was examined. The material was characterized using differential scanning calorimetry to identify the transformation temperatures and uniaxial tensile testing to portray the stress–strain behavior. Pre-cracked disk-shaped compact specimen was tested at room temperature and unstable crack growth was observed. Fracture toughness was measured using the associated load versus crack-mouth opening displacement record. Digital image correlation was implemented to obtain the strain field on the surface and near the crack-tip. Moreover, fracture surface was examined using scanning electron microscopy. The results provide key insights into the fracture properties of NiTiHf high-temperature SMAs.

Citation Download Citation

B. Haghgouyan, B. Young, I. Karaman, and D. C. Lagoudas "Fracture toughness of martensitic NiTiHf high-temperature shape memory alloy", Proc. SPIE 10968, Behavior and Mechanics of Multifunctional Materials XIII, 109680A (29 March 2019); https://doi.org/10.1117/12.2514432

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