Abstract
This paper investigates, both experimentally and numerically, the mechanical response of low porosity thin metal samples under fatigue loads. The specimens, characterized by an overall porosity of 10%, were designed using selected patterns of voids and then fatigue tested to estimate the influence of both auxetic and non-auxetic tessellations on the mechanical performance. During the loading, detailed deformation maps were recorded by means of bi-dimensional Digital Image Correlation (DIC). The experimental data collected during this study indicate that the use of auxetic patterns could be a strategy to enhance the fatigue life of porous structures. In addition, DIC analysis is shown to be an excellent non-contact experimental method to assess the cumulative damage of the samples and to predict the crack starting points well before they are detectable by the unaided eye.
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Francesconi, L., Taylor, M., Baldi, A. (2019). An Investigation of Stress Concentration, Crack Nucleation, and Fatigue Life of Thin Low Porosity Metallic Auxetic Structures. In: Carroll, J., Xia, S., Beese, A., Berke, R., Pataky, G. (eds) Fracture, Fatigue, Failure and Damage Evolution, Volume 6. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-95879-8_11
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DOI: https://doi.org/10.1007/978-3-319-95879-8_11
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