Improvement of void growth model and its application in simulating spallation experiments under different impact loading wave forms

ZHANG Fengguo; WANG Pei; WANG Yanjin; HU Jianbo

doi:10.11883/bzycj-2023-0218

Volume 44 Issue 5

May 2024

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ZHANG Fengguo, WANG Pei, WANG Yanjin, HU Jianbo. Improvement of void growth model and its application in simulating spallation experiments under different impact loading wave forms[J]. Explosion And Shock Waves, 2024, 44(5): 051201. doi: 10.11883/bzycj-2023-0218

Citation:

ZHANG Fengguo, WANG Pei, WANG Yanjin, HU Jianbo. Improvement of void growth model and its application in simulating spallation experiments under different impact loading wave forms[J]. Explosion And Shock Waves, 2024, 44(5): 051201. doi: 10.11883/bzycj-2023-0218

Citation:

ZHANG Fengguo, WANG Pei, WANG Yanjin, HU Jianbo. Improvement of void growth model and its application in simulating spallation experiments under different impact loading wave forms[J]. Explosion And Shock Waves, 2024, 44(5): 051201. doi: 10.11883/bzycj-2023-0218

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Improvement of void growth model and its application in simulating spallation experiments under different impact loading wave forms

doi: 10.11883/bzycj-2023-0218

1.
Institute of Applied Physics and Computational Mathematics, Beijing 100094, China
2.
National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China

Received Date: 2023-06-20
Rev Recd Date: 2023-10-08

Available Online: 2023-12-20

Publish Date: 2024-05-08

Abstract

Abstract

The dynamic tensile spallation damage caused by shock wave reflection on the free surface of target is one of the typical damage modes of materials. The initial microstructure of materials, the magnitude and strain rate of impact loading, temperature and other factors directly affect the spallation damage evolution process in materials. The change of free surface velocity c at the target indirectly reflects the evolution process of spall damage in materials. Regarding the study of physical model of spallation damage, only limited literatures are available on using suitable spallation damage model to simulate the free surface velocity profile of target under different impact loading waveforms. The relationship between loading waveforms and free surface velocity profile as well as the evolution process of spallation damage were mainly investigated by means of experiments. Considering that both the shear viscosity coefficient and the hardening coefficient are the basic parameters of the material, the calculation of the initial damage parameters of the damage model is now obtained by analyzing the relationship between the spall strength, the loading strain rate and the initial damage parameter of the damage model. The initial damage parameter of the damage model is effectively associated with the loading strain rate, and the programmed automatic calculation of the initial damage parameter under different loading strain rate is realized. On this basis, not only the free surface velocity profiles of spallation tests of aluminum materials loaded by square wave, triangular wave and Taylor wave can be well simulated, the calculated spall strengths and spall plate thicknesses are also consistent with the tests results. In addition, the relationship between the distribution of initial damage, spall strength and loading strain rate at different positions in the target is further anayzed. Consequently, compared with the existing damage model, the new method not only further improves the existing damage model, but also improves the validity of the calculation results. At the same time, it also provides ideas for improving other spall damage models.
- shock-wave profile shape,
- spall damage,
- free surface velocity,
- numerical analysis

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References(22)

References

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