Study on Dynamic Impact Response and Optimal Constitutive Model of Al-Mg-Si Aluminum Alloy
Al-Mg-Si series aluminum alloy is a heat-treatment-strengthened alloy. Research on the impact resistance of Al-Mg-Si series aluminum alloy is of great significance to expand its application in engineering. Taking 6082-T6 aluminum alloy as the concrete research object, using the split Hopkinson press...
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MDPI AG
2022-10-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/21/7618 |
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| author | Qinmin Zhang Xiaomin Huang Ran Guo Dongyu Chen |
| author_facet | Qinmin Zhang Xiaomin Huang Ran Guo Dongyu Chen |
| author_sort | Qinmin Zhang |
| collection | DOAJ |
| description | Al-Mg-Si series aluminum alloy is a heat-treatment-strengthened alloy. Research on the impact resistance of Al-Mg-Si series aluminum alloy is of great significance to expand its application in engineering. Taking 6082-T6 aluminum alloy as the concrete research object, using the split Hopkinson pressure bar (SHPB) device, the dynamic mechanical response of the material under different temperatures and average strain rates was studied, and the service performance of the material under extreme conditions was determined. The absolute temperature rise was introduced to optimize the existing constitutive model. The results show that when the environment temperature is 298.15~473.15 K under high-speed impact, the internal thermal softening effect of the material is dominant in the competition with the work hardening, resulting in a decrease in the flow stress of the material. Through the analysis of the real stress–strain curve, it was found that the elastic modulus of the material was negatively correlated with the strain rate, negatively correlated with the temperature, and showed an obvious temperature-softening effect. Yield strength was negatively correlated with temperature and positively correlated with strain rate, which showed an obvious strain rate hardening effect. Based on SEM microscopic analysis, it was found that under given conditions, adiabatic shear bands appeared in some samples, and their internal structures demonstrated obvious change. It was judged that when high-speed impact occurs, cracks are induced at the shear bands, and the cracks will continue to develop along the adiabatic shear bands, resulting in many oblique cracks which will gradually become larger and eventually lead to material failure. Finally, based on the model, the strain rate and temperature softening terms were improved, and a rise in adiabatic temperature rise was introduced. The improved model can better describe the strain rate effect of the material and accurately describe its flow stress. It provides a theoretical basis for the engineering application of materials. |
| first_indexed | 2024-03-09T18:53:38Z |
| format | Article |
| id | doaj.art-3f7c79dae9bf491d9c459f4a70cd6ecb |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T18:53:38Z |
| publishDate | 2022-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-3f7c79dae9bf491d9c459f4a70cd6ecb2023-11-24T05:38:07ZengMDPI AGMaterials1996-19442022-10-011521761810.3390/ma15217618Study on Dynamic Impact Response and Optimal Constitutive Model of Al-Mg-Si Aluminum AlloyQinmin Zhang0Xiaomin Huang1Ran Guo2Dongyu Chen3Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, ChinaFaculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, ChinaFaculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, ChinaFaculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, ChinaAl-Mg-Si series aluminum alloy is a heat-treatment-strengthened alloy. Research on the impact resistance of Al-Mg-Si series aluminum alloy is of great significance to expand its application in engineering. Taking 6082-T6 aluminum alloy as the concrete research object, using the split Hopkinson pressure bar (SHPB) device, the dynamic mechanical response of the material under different temperatures and average strain rates was studied, and the service performance of the material under extreme conditions was determined. The absolute temperature rise was introduced to optimize the existing constitutive model. The results show that when the environment temperature is 298.15~473.15 K under high-speed impact, the internal thermal softening effect of the material is dominant in the competition with the work hardening, resulting in a decrease in the flow stress of the material. Through the analysis of the real stress–strain curve, it was found that the elastic modulus of the material was negatively correlated with the strain rate, negatively correlated with the temperature, and showed an obvious temperature-softening effect. Yield strength was negatively correlated with temperature and positively correlated with strain rate, which showed an obvious strain rate hardening effect. Based on SEM microscopic analysis, it was found that under given conditions, adiabatic shear bands appeared in some samples, and their internal structures demonstrated obvious change. It was judged that when high-speed impact occurs, cracks are induced at the shear bands, and the cracks will continue to develop along the adiabatic shear bands, resulting in many oblique cracks which will gradually become larger and eventually lead to material failure. Finally, based on the model, the strain rate and temperature softening terms were improved, and a rise in adiabatic temperature rise was introduced. The improved model can better describe the strain rate effect of the material and accurately describe its flow stress. It provides a theoretical basis for the engineering application of materials.https://www.mdpi.com/1996-1944/15/21/76186082-T6dynamic impact responseadiabatic shearSHPBconstitutive model |
| spellingShingle | Qinmin Zhang Xiaomin Huang Ran Guo Dongyu Chen Study on Dynamic Impact Response and Optimal Constitutive Model of Al-Mg-Si Aluminum Alloy Materials 6082-T6 dynamic impact response adiabatic shear SHPB constitutive model |
| title | Study on Dynamic Impact Response and Optimal Constitutive Model of Al-Mg-Si Aluminum Alloy |
| title_full | Study on Dynamic Impact Response and Optimal Constitutive Model of Al-Mg-Si Aluminum Alloy |
| title_fullStr | Study on Dynamic Impact Response and Optimal Constitutive Model of Al-Mg-Si Aluminum Alloy |
| title_full_unstemmed | Study on Dynamic Impact Response and Optimal Constitutive Model of Al-Mg-Si Aluminum Alloy |
| title_short | Study on Dynamic Impact Response and Optimal Constitutive Model of Al-Mg-Si Aluminum Alloy |
| title_sort | study on dynamic impact response and optimal constitutive model of al mg si aluminum alloy |
| topic | 6082-T6 dynamic impact response adiabatic shear SHPB constitutive model |
| url | https://www.mdpi.com/1996-1944/15/21/7618 |
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