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Investigation on the influence of loading-rate on fracture toughness of AHSS grades

机译：加载速率对AHSS等级牌号断裂韧性影响的研究

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The automotive industry is striving for light body-in-white structures while maintaining or improving passenger safety. The aim of this paper is to investigate the influence of the loading rate on the fracture toughness of thin steel sheet metal of three advanced high strength steels. Although steel is a heavy material it plays a significant role for lightweight solutions in car bodies. Three different advanced high strength steel (AHSS) grades, namely dual-phase (DP), quench-partitioning (Q&P) and TRIP-assisted bainitic-ferritic (TBF), are investigated in the present paper. For crash relevant components it is of importance to know the material response under high loading velocities i.e. high strain rates. A standard tensile test system is used for low loading rates, a high-speed tensile testing setup is used to obtain high loading rates. The fracture toughness of the three AHSS grades is evaluated using the methodology of the Essential Work of Fracture (EWF). The tensile specimen used in the present work is the double edge notched tensile (DENT) geometry with a pre-developed crack. High-speed imaging is applied to verify the validity of the evaluation method Essential Work of Fracture at high rates of loading. Results from this work show that knowledge of fracture toughness would improve the understanding of fracture and crack propagation mechanisms for third generation high strength steels used for automotive components.
机译：汽车行业正在努力争取在保持或提高乘客安全性的同时，开发轻型白车身结构。本文的目的是研究加载速率对三种先进高强度钢的薄钢板断裂韧性的影响。尽管钢是很重的材料，但它在车身轻量化解决方案中起着重要作用。本文研究了三种不同的高级高强度钢（AHSS），即双相（DP），淬火分配（Q＆P）和TRIP辅助贝氏体-铁素体（TBF）。对于与碰撞相关的组件，了解高载荷速度（即高应变速率）下的材料响应非常重要。标准拉伸测试系统用于低加载率，高速拉伸测试设备用于获得高加载率。使用“基本断裂功”（EWF）的方法评估了三个AHSS等级的断裂韧性。当前工作中使用的拉伸试样是带有预先形成的裂纹的双边缺口拉伸（DENT）几何形状。应用高速成像来验证评估方法在高载荷下的断裂基本功的有效性。这项工作的结果表明，对断裂韧性的了解将改善对用于汽车零部件的第三代高强度钢的断裂和裂纹扩展机理的了解。

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