Titolo:  An investigation of stress concentration, crack nucleation, and fatigue life of thin low porosity metallic auxetic structures
Data di pubblicazione:  2019
Autori:  Francesconi, L.; Taylor, M.; Baldi, A.
Presenza coautori internazionali: 
Lingua:  Inglese
Titolo del libro:  Fracture, Fatigue, Failure and Damage Evolution, Volume 6. Proceedings of the 2018 Annual Conference on Experimental and Applied Mechanics
ISBN:  978-3-319-95878-1
Editore:  Springer
Pagina iniziale:  65
Pagina finale:  71
Numero di pagine:  7
Digital Object Identifier (DOI):  http://dx.doi.org/10.1007/978-3-319-95879-8_11
Codice identificativo Scopus:  2-s2.0-85053498171
Codice identificativo ISI:  WOS:000557922600011
URL:  https://link.springer.com/chapter/10.1007/978-3-319-95879-8_11
Revisione (peer review):  Comitato scientifico
Nome del convegno:  2018 Annual Conference on Experimental and Applied Mechanics
Periodo del convegno:  4-7 June 2018
Luogo del convegno:  Greenville, NC, USA
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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