Martensite variant localization effects on fatigue crack growth - The CuZnAl example. (October 2019)

• Record Type: Journal Article
• Authors: Yaacoub, J.; Wu, Y.; Abuzaid, W.; Canadinc, D.; Sehitoglu, H.
• Is Part Of: Scripta materialia. Number 171(2019)
• Page Start: 112
• Page End: 117
• Publication Date: 2019-10
• Subjects: Stress induced martensite -- Crack opening displacement -- Superelasticity -- CuZnAl -- Fatigue crack growth; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.06.032
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: 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. Graphical abstract: Unlabelled Image