Abstract: With the increasingly stringent automotive safety regulations, and the deepening trend of lightweight new energy vehicles, battery pack safety is becoming the core of new energy vehicle safety. In this paper, 5083 aluminum alloy, which is mainly used in the battery pack side guard plate, is taken as the research object. A test matrix is designed to obtain the material mechanical properties at different tensile strain rates and a variety of stress states, including static notch tensile, central hole tensile, shear and tensile shear. Through the self-developed software, the strain hardening curve and the parameters of molified Mohr-Coulomb (MMC) damage model are established and calibrated. And the reasonable of the MMC damage model is verified by three-point bending test and dynamic punching test. The results show that the failure model obtained in this study can better predict the fracture failure behavior of 5083 aluminum alloy, which provides a powerful material data basis for the safety performance analysis of new energy vehicle battery packs.

Key words: 5083 aluminum alloy; Fracture criterion; MMC damage model

摘要： 随着汽车安全法规的逐渐严苛、新能源汽车轻量化趋势的不断深入，电池包安全成为 新能源车型安全的核心。文章以主要应用于新能源汽车电池包侧护板的 5083 铝合金为研究对 象，通过铝合金静态拉伸、动态拉伸、静态缺口拉伸、中心孔拉伸、剪切、拉剪等试验获得 了铝合金在不同应力状态下的力学性能，采用自研软件建立和标定了材料应变硬化曲线和修 正莫尔-库仑（MMC）断裂损伤模型参数，并通过三点弯曲试验和动态穿孔验证了 MMC 失效 模型的合理性。结果表明，本研究中得到的失效模型可以较好地预测 5083 铝合金断裂失效行 为，为新能源汽车电池包的安全性能分析提供了有力的材料数据基础。

关键词: 5083 铝合金；断裂准则；MMC 失效模型