Effect of damage evolution on the fragmentation process of ductile metals

CAO Xiang; TANG Jiani; WANG Zhu; ZHENG Yuxuan; ZHOU Fenghua

doi:10.11883/bzycj-2019-0041

Volume 40 Issue 1

Jan. 2020

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CAO Xiang, TANG Jiani, WANG Zhu, ZHENG Yuxuan, ZHOU Fenghua. Effect of damage evolution on the fragmentation process of ductile metals[J]. Explosion And Shock Waves, 2020, 40(1): 013102. doi: 10.11883/bzycj-2019-0041

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CAO Xiang, TANG Jiani, WANG Zhu, ZHENG Yuxuan, ZHOU Fenghua. Effect of damage evolution on the fragmentation process of ductile metals[J]. Explosion And Shock Waves, 2020, 40(1): 013102. doi: 10.11883/bzycj-2019-0041

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Effect of damage evolution on the fragmentation process of ductile metals

doi: 10.11883/bzycj-2019-0041

MOE Key Laboratory of Impact and Safety Engineering, Ningbo University, Ningbo 315211, Zhejiang, China

Received Date: 2019-02-01
Rev Recd Date: 2019-05-16

Available Online: 2019-12-25

Publish Date: 2020-01-01

Abstract

Abstract

Solids will be broken into multiple fragments under dynamic tension loadings. The Mott-Grady model based on linear cohesive fracture can predict the lower limits of average fragment size during fragmentation process. However, the damage evolution of ductile materials is diversified. In this paper, the ductile fracture processes influenced by different damage evolutions were studied by numerical simulation. Using ABAQUS/Explicit dynamic finite element, we reproduced the tensile fracture process of ductile metal bar (45 steel) at high strain rates. The effects of linear/nonlinear damage evolutions on ductile fracture process were analyzed. The numerical results show that the damage evolution law has a significant influence on the fragmentation process of ductile metals. As the nonlinear parameter increases, the number of fragments decreases during fragmentation process. The Grady-Kipp formula can still reasonably predict the lower limits of the ductile fragment sizes in a certain range. When the non-linear index α was far greater than zero, there are conspicuous deviations between the numerical experiments and the Grady-Kipp model under the low impact loading. With increasing strain rate, the results by the numerical simulations are in agreement with the ones by the Grady-Kipp theoretical model.
- ductile fragmentation,
- damage evolution,
- Grady-Kipp formula,
- fragment size

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References(16)

References

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