Extension of a shear-controlled ductile fracture criterion by considering the necking coalescence of voids
TL;DR: An isotropic fracture criterion considering nucleation, growth, shear coalescence and necking coalescence of voids during plastic deformation is developed to model fracture behavior of ductile metals as discussed by the authors.
About: This article is published in International Journal of Solids and Structures.The article was published on 2022-02-01. It has received 5 citations till now. The article focuses on the topics: Necking & Materials science.
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TL;DR: The fracture properties of a high-strength steel with a body-centered cubic (bcc) crystal structure have been characterized at −196 °C by performing tensile tests with different specimen geometries, three-point bending tests using Charpy specimens, and fracture mechanics tests, covering a broad range of stress states under quasi-static conditions as discussed by the authors .
11 citations
TL;DR: In this paper , a stress-based shear fracture criterion is proposed to improve the prediction accuracy of failure for lightweight metal forming by taking into account the stress state effect on fracture in a form of the stress triaxiality, the maximum shear stress and the Lode parameter.
6 citations
TL;DR: In this paper , a combined linear and power stress-strain law with a shear plastic factor is proposed to characterize the mechanical behavior of steel plates under shear dominated state.
3 citations
01 Jan 2023-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article , the formation of voids is driven by local microstructural heterogeneities, which are predominantly twins for Mg and predominantly grain fragmentations including shear bands for Ti.
Abstract: This paper presents the main findings acquired in an experimental investigation into where voids form in microstructures of pure Mg, Mg–3Zn alloy, and pure Ti after tension to near fracture. To facilitate a statistical study, 52 voids in Mg and 62 voids in Ti along with local microstructures surrounding them were observed using a high-resolution electron backscattered diffraction (EBSD) mapping. Distributions capturing shape and orientation of voids with respect to loading direction were created as these geometric features give rise to local stress concentrations. Microstructural evolution and, in particular, the formation of deformation twins as local heterogeneities in the structures was observed to significantly influence the formation of voids in both Mg and Ti since these metals accommodate plastic strains by profuse twinning and grain fragmentations in addition to slip. To this end, distributions featuring the number of twin families neighboring each void, specific twin family neighboring each void, and voids taking shape of prior twins were formed. The observations and distributions reveal that formation of voids is driven by local microstructural heterogeneities, which are predominantly twins for Mg and predominantly grain fragmentations including shear bands for Ti. While substantial number of voids neighbor at least one twin family in both Mg and Ti, voids are predominantly twin-like i.e., lamellar in Mg but predominantly spherical in Ti. While the lamellar voids in Mg are elongated in the direction of twins, which is typically greater than ±30° from a pulling direction, a minor content of elongated voids in Ti align with the pulling direction. Such statistical distributions along with qualitative observations are presented and discusses highlighting the comparisons between the two metals exhibiting substantial differences in ductility and fracture behavior.
1 citations
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TL;DR: In this article, a set of elastic-plastic constitutive relations that account for the nucleation and growth of micro-voids is used to model the failure of a round tensile test specimen.
2,962 citations
TL;DR: In this paper, a model of isotropic ductile plastic damage based on a continuum damage variable, on the effective stress concept and on thermodynamics is derived, showing a large influence of triaxiality by means of a damage equivalent stress.
Abstract: A model of isotropic ductile plastic damage based on a continuum damage variable, on the effective stress concept and on thermodynamics is derived. The damage is linear with equivalent strain and shows a large influence of triaxiality by means of a damage equivalent stress. Identification for several metals is made by means of elasticity modulus change induced by damage. A comparison with the McClintock and Rice-Tracey models and with some experiments is presented for the influence of triaxiality on the strain to rupture.
2,327 citations
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TL;DR: In this article, a series of tests including upsetting tests, shear tests and tensile tests on 2024-T351 aluminum alloy providing clues to fracture ductility for a wide range of stress triaxiality was carried out.
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