Abstract

Shape memory alloys (SMAs) are employed in innovative applications experiencing millions of cycles during their lifetime. The existing failure criteria are purely phenomenological based on macroscopic experimental results and ignore their complex microstructure. The proposed paper presents a two-scale fatigue criterion based on the elastic shakedown of the austenitic and martensitic grains of the Dang Van - Papadopoulos class. The underlying assumptions and predictions are discussed on a series of novel experiments and compared with results from literature.

Conclusions and Perspectives

This paper has investigated the elastic shakedown behavior of SMA materials and has presented the extension of the DV high cycle fatigue criterion to SMAs and opens a novel way to analyze the onset of damage for materials involving phase change. The analysis also open a realm of new questions ranging from additional insight into microscopic deformation and damage mechanisms at the phase boundaries to innovative methods for the fast identification of fatigue limits, such as infrared thermography measurements.

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