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Estimation of the Onset of Crack Growth in Ductile Materials

In this paper, the ductile fracture mechanism is discussed. The results of numerical and experimental analyses were used to estimate the onset of crack front growth. It was assumed that the ductile fracture in front of the crack starts at the location along the crack front where the accumulated effe...

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Autores principales: Neimitz, Andrzej, Galkiewicz, Jaroslaw, Lipiec, Sebastian, Dzioba, Ihor
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6213125/
https://www.ncbi.nlm.nih.gov/pubmed/30340383
http://dx.doi.org/10.3390/ma11102026
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author Neimitz, Andrzej
Galkiewicz, Jaroslaw
Lipiec, Sebastian
Dzioba, Ihor
author_facet Neimitz, Andrzej
Galkiewicz, Jaroslaw
Lipiec, Sebastian
Dzioba, Ihor
author_sort Neimitz, Andrzej
collection PubMed
description In this paper, the ductile fracture mechanism is discussed. The results of numerical and experimental analyses were used to estimate the onset of crack front growth. It was assumed that the ductile fracture in front of the crack starts at the location along the crack front where the accumulated effective plastic strain reaches a critical value. According to numerous research articles, the critical effective plastic strain depends on the stress triaxiality and the Lode angle. The experimental program was performed using five different specimen geometries, three different materials, and three different temperatures of +20 °C, −20 °C, and −50 °C. Using the experimental data and results of the finite element computations, the critical effective plastic strains were determined for each material and temperature. However, before the critical effective plastic strain was determined, a careful calibration of the stress–strain curves was performed after modification of the Bai–Wierzbicki procedure. It was found that critical effective plastic strain was a function of triaxiality factor and Lode parameter, as expected, and that the fracture locus was useful to estimate the onset of ductile crack growth.
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spelling pubmed-62131252018-11-14 Estimation of the Onset of Crack Growth in Ductile Materials Neimitz, Andrzej Galkiewicz, Jaroslaw Lipiec, Sebastian Dzioba, Ihor Materials (Basel) Article In this paper, the ductile fracture mechanism is discussed. The results of numerical and experimental analyses were used to estimate the onset of crack front growth. It was assumed that the ductile fracture in front of the crack starts at the location along the crack front where the accumulated effective plastic strain reaches a critical value. According to numerous research articles, the critical effective plastic strain depends on the stress triaxiality and the Lode angle. The experimental program was performed using five different specimen geometries, three different materials, and three different temperatures of +20 °C, −20 °C, and −50 °C. Using the experimental data and results of the finite element computations, the critical effective plastic strains were determined for each material and temperature. However, before the critical effective plastic strain was determined, a careful calibration of the stress–strain curves was performed after modification of the Bai–Wierzbicki procedure. It was found that critical effective plastic strain was a function of triaxiality factor and Lode parameter, as expected, and that the fracture locus was useful to estimate the onset of ductile crack growth. MDPI 2018-10-18 /pmc/articles/PMC6213125/ /pubmed/30340383 http://dx.doi.org/10.3390/ma11102026 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Neimitz, Andrzej
Galkiewicz, Jaroslaw
Lipiec, Sebastian
Dzioba, Ihor
Estimation of the Onset of Crack Growth in Ductile Materials
title Estimation of the Onset of Crack Growth in Ductile Materials
title_full Estimation of the Onset of Crack Growth in Ductile Materials
title_fullStr Estimation of the Onset of Crack Growth in Ductile Materials
title_full_unstemmed Estimation of the Onset of Crack Growth in Ductile Materials
title_short Estimation of the Onset of Crack Growth in Ductile Materials
title_sort estimation of the onset of crack growth in ductile materials
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6213125/
https://www.ncbi.nlm.nih.gov/pubmed/30340383
http://dx.doi.org/10.3390/ma11102026
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