Crack shapes and crack driving force distributions for naturally growing fatigue cracks
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Extensive literature supports that fatigue cracks tend to a stable stage driven by an iso crack driving force (CDF) distribution that produces a quasi-constant crack shape. Here fatigue crack growth is studied by two means: 1) a finite element simulation based on crack-tip opening displacements and remeshing and mapping strategies and 2) a theoretical analysis based on the multiple-degree-of-freedom scheme and power-law crack growth relationships. Contrary to the literature, naturally growing fatigue cracks are found to converge towards a quasi-constant crack-shape regime promoted by a non-iso CDF distribution that depends on material properties and the stable crack shape
Extensive literature supports that fatigue cracks tend to a stable stage driven by an iso crack driving force (CDF) distribution that produces a quasi-constant crack shape. Here fatigue crack growth is studied by two means: 1) a finite element simulation based on crack-tip opening displacements and remeshing and mapping strategies and 2) a theoretical analysis based on the multiple-degree-of-freedom scheme and power-law crack growth relationships. Contrary to the literature, naturally growing fatigue cracks are found to converge towards a quasi-constant crack-shape regime promoted by a non-iso CDF distribution that depends on material properties and the stable crack shape
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The authors would like to express their gratitude to the Spanish Ministry of Science and Innovation for the financial support given through project MCI-20-PID2019-105593GB-I00/AEI/10.13039/501100011033 and project CER-20190001 within the program ‘‘AYUDAS CERVERA PARA CENTROS TECNOLÓGICOS 2019’’. Ikerlan is currently certificated as CENTRO DE EXCELENCIA CERVERA
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