A micromechanically motivated uncoupled model for ductile fracture prediction

MU Lei; ZANG Yong; Araujo Stemler Pedro Malaquias

doi:10.13374/j.issn2095-9389.2017.04.011

Volume 39 Issue 4

Apr. 2017

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MU Lei, ZANG Yong, Araujo Stemler Pedro Malaquias. A micromechanically motivated uncoupled model for ductile fracture prediction[J]. Chinese Journal of Engineering, 2017, 39(4): 557-566. doi: 10.13374/j.issn2095-9389.2017.04.011

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MU Lei, ZANG Yong, Araujo Stemler Pedro Malaquias. A micromechanically motivated uncoupled model for ductile fracture prediction[J]. Chinese Journal of Engineering, 2017, 39(4): 557-566. doi: 10.13374/j.issn2095-9389.2017.04.011

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A micromechanically motivated uncoupled model for ductile fracture prediction

doi: 10.13374/j.issn2095-9389.2017.04.011

1) School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China
2) Center for Precision Forming, the Ohio State University, Columbus 43210, USA

Received Date: 2016-12-25

Abstract

Abstract

This paper is a contribution to the ductile fracture prediction by the proposal of a new uncoupled ductile fracture criterion. In the new criterion, two typical void deformation models were carefully considered, with the plastic strain increment regarded as a key impetus of the damage evolution and its accumulation. The new ductile fracture criterion was constructed with three model parameters with different physical meanings. A 3D ductile fracture surface model was obtained by transforming the proposed criterion from stress space to the space of stress triaxiality, Lode parameter, and fracture strain, and a parametric study was carried out to better understand their effects. To validate the performance of the new criterion, it was used to construct the 3D fracture surfaces of 5083-O aluminum alloy, TRIP690, and Docol 600DL (a dual-phase steel). Comparisons of the results with experimental observations indicate that the proposed criterion provides good prediction capability over a large range of stress states for various materials, with good flexibility and considerable accuracy.
- ductile fracture,
- uncoupled,
- stress triaxiality,
- Lode parameter,
- void evolution

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References(32)

References

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