Repository logo
 

Modelling fatigue crack growth in shape memory alloys

Published version
Peer-reviewed

Type

Article

Change log

Authors

Braithwaite, Christopher  ORCID logo  https://orcid.org/0000-0002-9916-3883
Makaya, Advenit 
Martínez-Pañeda, Emilio 

Abstract

We present a phase field-based framework for modelling fatigue damage in Shape Memory Alloys (SMAs). The model combines, for the first time: (i) a generalized phase field description of fracture, incorporating multiple phase field formulations, (ii) a constitutive model for SMAs, based on a Drucker–Prager form of the transformation surface, and (iii) a fatigue degradation function, with damage driven by both elastic and transformation strains. The theoretical framework is numerically implemented, and the resulting linearized system is solved using a robust monolithic scheme, based on quasi-Newton methods. Several paradigmatic boundary value problems are addressed to gain insight into the role of transformation stresses, stress-strain hysteresis, and temperature. Namely, we compute Δε - N curves, quantify Paris law parameters, and predict fatigue crack growth rates in several geometries. In addition, the potential of the model for solving large-scale problems is demonstrated by simulating the fatigue failure of a 3D lattice structure.

Description

Keywords

Journal Title

Fatigue and Fracture of Engineering Materials and Structures

Conference Name

Journal ISSN

1460-2695

Volume Title

Publisher

Wiley
Sponsorship
Engineering and Physical Sciences Research Council (1946860)
European Space Agency