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Rate effects on the estimation of fracture toughness by small punch tests in hydrogen embrittlement

Abstract: In this article, different techniques to test notched small punch test samples in fracture conditions in aggressive environments are studied, based on the comparison of the micromechanisms at different rates. Pre-embrittled samples subsequently tested in air at rates conventionally employed (0.01 and 0.002?mm/s) are compared to embrittled ones tested in environment at the same rates (0.01 and 0.002?mm/s) and at a very slow rate (5E?5?mm/s). A set of samples tested in environment under a set of constant loads that produce very slow rates completes the experimental results. As a conclusion, it is recommended to test small punch test notched specimens in environment at very slow rates, of around E?6?mm/s, when characterizing in hydrogen embrittlement scenarios, in order to allow the material?environment interaction to govern the process.

 Fuente: Journal of Strain Analysis for Engineering Design Vol 54, Issue 7-8, 2019

 Editorial: SAGE Publications Ltd.

 Fecha de publicación: 13/05/2019

 Nº de páginas: 11

 Tipo de publicación: Artículo de Revista

 DOI: 10.1177/0309324719848243

 ISSN: 0309-3247,2041-3130

 Proyecto español: MAT2011-28796-C03 ; MAT2014-58738C3-3-R

 Url de la publicación: https://doi.org/10.1177/0309324719848243