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

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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. 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. 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. 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

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 strength 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 of target indirectly reflects the evolution process of spall damage in materials. For the research of physical model of spallation damage, there are few literatures about 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 and the evolution process of spallation damage is mainly discussed by means of experiments. Considering that the shear viscosity coefficient and the hardening coefficient are the basic parameters of the material, the calculation method of the initial damage parameters of the damage model is given by analyzing the relationship between the spall strength, the loading strain rate and the initial damage paramer of the damagr model. The initial damage parameter of the damage model is effectively associated with the loading strain rate, and the program automatic calculation of the intial damage parameter under different loading strain ratea 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 consisten 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. So, 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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