Title: Investigation of cracking in small punch test for semi-brittle materials
Authors: SIMONOVSKI IGORHOLMSTROM BJORNBARALDI DANIELEDELVILLE REMI
Citation: THEORETICAL AND APPLIED FRACTURE MECHANICS vol. 108 p. 102646
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2020
JRC N°: JRC119264
ISSN: 0167-8442 (online)
URI: https://publications.jrc.ec.europa.eu/repository/handle/JRC119264
DOI: 10.1016/j.tafmec.2020.102646
Type: Articles in periodicals and books
Abstract: The Gurson-Tvergaard-Needleman damage model is implemented in Small Punch (SP) Finite element model with the purpose of evaluating the influence of crack initialization and propagation on the SP force-displacement (F-v) curves and the maximum force, Fm, which is used for estimating the Rm. Five materials, significantly different in Rm and ductility are investigated. Numerical calculations are performed and compared to the the experimental measurements to evaluate the accuracy of the model. It is shown that the model is capable of capturing crack initialization in the semi-brittle 15-15Ti46CW and 15-15Ti24CW, both in terms of the number of cracks and their positions. For these two materials and the more ductile P92 and P92, the simulations indicate signifficant impact of damage on the F-v curves in the vicinity of the maximal force, Fm. This can signifficantly influuence the estimation of Rm from the Fm and vm points. However, the model tends to predict the crack initialization at a larger displacement compared to the experiments.
JRC Directorate:Nuclear Safety and Security

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