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Dynamic Perforation of Lightweight Armor: Temperature-dependent Plasticity and Fracture of Aluminum 7020-T6
Mechanics of Materials ( IF 3.4 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.mechmat.2020.103537
Christian C. Roth , Teresa Fras , Dirk Mohr

Abstract The design of armored vehicles requires reliable constitutive models that are valid over a wide range of strain rates and temperatures. A comprehensive experimental program is executed to characterize the stress-strain response of high strength aluminum 7020-T6 at temperatures ranging from 20°C to 320°C. It includes tensile experiments on uniaxial, notched, central hole and shear specimens. Aside from low and intermediate strain rate experiments, high strain rate experiments are performed on a Split Hopkinson Pressure Bar (SHPB) system equipped with a load inversion device. Furthermore, hemispherical punch and V-bending experiments are performed to achieve equi-biaxial tension and transverse plane strain conditions. It is found that a Yld2000–3d plasticity model with isotropic strain hardening and thermal softening is suitable to describe the large deformation response, while a rate- and temperature-independent Hosford-Coulomb model is used to predict fracture. Impact experiments are performed on 4 mm thick targets with blunt, hemispherical and conical steel projectiles of 8 mm diameter and a mass of 13.8 g. The impact velocity is varied such that the full spectrum from the ballistic limit to complete penetration can be characterized. In addition, perpendicular and oblique configurations are considered. Numerical simulations are performed for all experiments confirming the validity of the identified constitutive model and providing unmatched insight into the dynamic penetration failure mechanism.

中文翻译:

轻型装甲的动态穿孔:铝 7020-T6 的温度依赖性塑性和断裂

摘要 装甲车辆的设计需要在广泛的应变率和温度范围内有效的可靠本构模型。执行综合实验程序来表征高强度铝 7020-T6 在 20°C 至 320°C 的温度范围内的应力应变响应。它包括单轴、缺口、中心孔和剪切试样的拉伸试验。除了低应变率和中应变率实验外,高应变率实验还在配备负载反转装置的分裂式霍普金森压力棒 (SHPB) 系统上进行。此外,还进行了半球形冲头和 V 形弯曲实验,以实现等双轴拉伸和横向平面应变条件。发现具有各向同性应变硬化和热软化的 Yld2000-3d 塑性模型适用于描述大变形响应,而与速率和温度无关的 Hosford-Coulomb 模型用于预测断裂。用直径为 8 毫米、质量为 13.8 克的钝的、半球形和锥形钢弹丸对 4 毫米厚的目标进行冲击实验。冲击速度是变化的,因此可以表征从弹道极限到完全穿透的全谱。此外,还考虑了垂直和倾斜配置。对所有实验进行了数值模拟,确认了所识别的本构模型的有效性,并提供了对动态穿透失效机制的无与伦比的洞察力。而与速率和温度无关的 Hosford-Coulomb 模型用于预测断裂。用直径为 8 毫米、质量为 13.8 克的钝的、半球形和锥形钢弹丸对 4 毫米厚的目标进行冲击实验。冲击速度是变化的,因此可以表征从弹道极限到完全穿透的全谱。此外,还考虑了垂直和倾斜配置。对所有实验进行了数值模拟,确认了所识别的本构模型的有效性,并提供了对动态穿透失效机制的无与伦比的洞察力。而与速率和温度无关的 Hosford-Coulomb 模型用于预测断裂。用直径为 8 毫米、质量为 13.8 克的钝的、半球形和锥形钢弹丸对 4 毫米厚的目标进行冲击实验。冲击速度是变化的,因此可以表征从弹道极限到完全穿透的全谱。此外,还考虑了垂直和倾斜配置。对所有实验进行了数值模拟,确认了所识别的本构模型的有效性,并提供了对动态穿透失效机制的无与伦比的洞察力。冲击速度是变化的,因此可以表征从弹道极限到完全穿透的全谱。此外,还考虑了垂直和倾斜配置。对所有实验进行了数值模拟,确认了所识别的本构模型的有效性,并提供了对动态穿透失效机制的无与伦比的洞察力。冲击速度是变化的,因此可以表征从弹道极限到完全穿透的全谱。此外,还考虑了垂直和倾斜配置。对所有实验进行了数值模拟,确认了所识别的本构模型的有效性,并提供了对动态穿透失效机制的无与伦比的洞察力。
更新日期:2020-10-01
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