Constitutive and impact response of AA7475-T7351 under different projectile shapes and velocities: An experimental and numerical investigation

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL International Journal of Impact Engineering Pub Date : 2024-08-21 DOI:10.1016/j.ijimpeng.2024.105095
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Abstract

Through experimental and numerical investigation, this article investigates the constitutive and impact response of the 1.6 mm thick AA7474-T7351 plate under the impact of blunt and hemispherical-nosed projectiles at different velocities. The Johnson-Cook plasticity and failure model parameters were calibrated for the target material using experimental data from the tensile experiments, which took into consideration the effects of plastic strain, strain rate, temperature and stress triaxiality. Further, JC plasticity model parameters were also optimised using a parametric optimisation process. The flow stress of AA7475-T7351 shows positive and negative sensitivity toward loading rate and temperature. It is observed that the ductility of AA7475-T7351 decreases with increases in stress triaxiality, whereas the flow stress increases. Perforation experiments on 1.6 mm thick circular AA7475-T7351 plates were carried out using a single-stage gas gun along with the high-speed Digital Image Correlation (3D-DIC) technique. The blunt nose projectile causes shear failure, whereas hemispherical nose projectile causes combined tension-shear failure; a microscopic study is performed to confirm this phenomenon. Experimental results obtained from DIC were validated using the numerical analysis in the Abaqus/Explicit platform in terms of transient out-of-plane deformation of the target plate. The quantitative error between experimental and numerical analysis was evaluated using the Russell error technique. Numerical analysis revealed that constitutive relations could predict the physical fracture mechanisms during perforation qualitatively as well as quantitatively.

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不同射弹形状和速度下 AA7475-T7351 的构造和冲击响应:实验和数值研究
本文通过实验和数值研究,探讨了 1.6 mm 厚的 AA7474-T7351 板材在不同速度的钝头和半球头弹丸冲击下的构成和冲击响应。利用拉伸实验数据校准了目标材料的约翰逊-库克塑性和破坏模型参数,其中考虑了塑性应变、应变速率、温度和应力三轴性的影响。此外,还利用参数优化过程对 JC 塑性模型参数进行了优化。AA7475-T7351 的流动应力对加载速率和温度呈现正负敏感性。据观察,AA7475-T7351 的延展性会随着应力三轴度的增加而降低,而流动应力则会增加。使用单级气枪和高速数字图像相关(3D-DIC)技术对 1.6 毫米厚的圆形 AA7475-T7351 板材进行了穿孔实验。钝头弹丸会导致剪切破坏,而半球形弹丸则会导致拉伸和剪切联合破坏;为证实这一现象进行了显微研究。利用 Abaqus/Explicit 平台对靶板的瞬态平面外变形进行数值分析,验证了 DIC 得出的实验结果。使用罗素误差技术评估了实验和数值分析之间的定量误差。数值分析表明,构成关系可以定性和定量地预测穿孔过程中的物理断裂机制。
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来源期刊
International Journal of Impact Engineering
International Journal of Impact Engineering 工程技术-工程:机械
CiteScore
8.70
自引率
13.70%
发文量
241
审稿时长
52 days
期刊介绍: The International Journal of Impact Engineering, established in 1983 publishes original research findings related to the response of structures, components and materials subjected to impact, blast and high-rate loading. Areas relevant to the journal encompass the following general topics and those associated with them: -Behaviour and failure of structures and materials under impact and blast loading -Systems for protection and absorption of impact and blast loading -Terminal ballistics -Dynamic behaviour and failure of materials including plasticity and fracture -Stress waves -Structural crashworthiness -High-rate mechanical and forming processes -Impact, blast and high-rate loading/measurement techniques and their applications
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