Martensite variant localization effects on fatigue crack growth - The CuZnAl example

SCRIPTA MATERIALIA

卷:171

Article

Yaacoub, J.¹  Wu, Y.¹  Abuzaid, W.²  Canadinc, D.^1,3  Sehitoglu, H.¹ 

[1] Univ Illinois, Dept Mech Sci & Engn, 1206 W Green St, Urbana, IL 61801 USA

[2] Amer Univ Sharjah, Dept Mech Engn, POB 26666, Sharjah, U Arab Emirates

[3] Koc Univ, Dept Mech Engn, AMG, TR-34450 Istanbul, Turkey

关键词: Stress induced martensite;    Crack opening displacement;    Superelasticity;    CuZnAl;    Fatigue crack growth;   

DOI  :  10.1016/j.scriptamat.2019.06.032

来源: Elsevier

【 摘 要 】

The paper underscores the difficulty in characterizing crack growth in shape memory alloys with conventional stress intensity approaches even when anisotropy is accounted for. The local displacements deviate significantly from the presumed K solutions because of transformation localization at macro scales extending from the crack tip. Modifications in stress intensity due to variant induced tractions are derived providing an explanation of the extrinsic behavior. Precise displacement and strain measurements are provided to highlight the complexity of deformation and the need for better fracture mechanics models, including crack tip opening displacements, to characterize fatigue crack growth in shape memory alloys. (C) 2019 Acta Materialia Inc Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free