基于激波管成形技术的AA5052-H32板材断裂和流动应力模型的实现

IF 1.5 4区 材料科学 Q3 ENGINEERING, MECHANICAL
S. K. Barik, Ganesh R Narayanan, N. Sahoo
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引用次数: 0

摘要

选择流动应力模型和断裂模型来模拟高应变速率下的薄板变形是非常值得关注的。在本工作中,在使用刚性尼龙撞击器对1mm厚的AA 5052-H32片材进行冲击管冲击成形的过程中也尝试了同样的方法。为此,使用DEFORM 3D进行了实验室规模的实验和有限元模拟。测试了Johnson-Cook流动应力模型和改进的Johnson-库克流动应力模式,以及归一化Cockcroft和Latham模型、Rice和Tracey模型、Oyane模型和McClintock模型等裂缝模型的准确性和一致性。裂缝应变和裂缝形态评价表明,改进的Johnson-Cook流动应力模型和Rice and Tracey裂缝模型适用于裂缝预测,最好将它们结合起来进行裂缝评价。提出了一种评估片材在较高应变速率下与速率相关的拉伸性能的替代方法,并给出了可接受的断裂预测结果。使用霍洛蒙幂律的有限元模拟预测了在49.79m/s的冲击速度下1925/s的应变速率,这在爆炸成形文献中的数值范围内。用于校准断裂模型的系统冲击管成形实验是可接受的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Implementation of Fracture and Flow Stress Models for AA5052-H32 Sheet Deformed through Shock Tube Based Forming Technique
Selection of flow stress models and fracture models to model sheet deformation at high strain rates is of great concern. The same is attempted in the present work during shock tube impact forming of 1 mm thick AA 5052-H32 sheet using a rigid nylon striker. Lab scale experiments and finite element simulations using DEFORM 3D are conducted for the purpose. Johnson-Cook flow stress model and Modified Johnson-Cook flow stress model along with fracture models like normalized Cockcroft and Latham model, Rice and Tracey model, Oyane model and McClintock model are tested for their accuracy and consistency. The fracture strain and fracture pattern evaluation suggest that the modified Johnson-Cook flow stress model and Rice and Tracey fracture model are suitable for fracture prediction, and it is better to use these together for fracture evaluation. An alternate method of evaluating rate-dependent tensile properties of sheet at higher strain rates is proposed and delivered acceptable fracture prediction results. Finite element simulations using Hollomon power law predict strain rate of 1925 /s at a striker velocity of 49.79 m/s, which is in the range of values in literature for explosive forming. Systematic shock tube forming experiments for calibrating the fracture models are acceptable.
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来源期刊
CiteScore
3.00
自引率
0.00%
发文量
30
审稿时长
4.5 months
期刊介绍: Multiscale characterization, modeling, and experiments; High-temperature creep, fatigue, and fracture; Elastic-plastic behavior; Environmental effects on material response, constitutive relations, materials processing, and microstructure mechanical property relationships
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