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首页> 外文期刊>Materials Science and Engineering >Mechanical and fracture behavior of high strength steels under high strain rate deformation: Experiments and modelling
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Mechanical and fracture behavior of high strength steels under high strain rate deformation: Experiments and modelling

机译：高应变率变形下高强度钢的力学和断裂行为：实验和建模

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By the automotive structure design, aashworthiness has become also an important issue so that a better understanding of plastic deformation of material at high velocity is necessary. The effects of strain rate on mechanical properties and fracture mechanism of ferritic-martensitic dual phase (DP) steel grades 780 and 1000 were investigated by both experiments and micromechanics based modeling. For the examined steels, quasi-static (0.001 s-1) and medium strain rate (0.5-1 s-1) tensile tests were carried out on a universal testing machine, while high strain rate (1500-2500 s-1) tests were performed by a Split-Hopkinson tensile bar. Afterwards, FE simulations using 2D representative volume elements (RVEs) were conducted for investigating microstructure effects on local deformation and damage of DP steels under varying strain rates. Flow curves of observed phase constituents at different strain rates were described by using a dislocation based theory and local chemical composition in combination with the Johnson-Cook (JC) hardening model. Furthermore, individual damage criteria based on the rate-dependent JC failure model were applied to describe the local crack mechanisms in DP microstructures. Calculated local stresses, strains and damage developments of deformed phases were studied. It was found that microstructure characteristics especially phase fraction differently affected the strain hardening and ductility of DP steels under low and high strain rate deformation. The damage initiation and propagation in microstructures of both steels at various strain rates predicted by RVE simulations were well correlated with the experimental results.
机译：通过汽车结构设计，耐灰性也已成为重要问题，因此有必要更好地理解材料在高速下的塑性变形。通过实验和基于微力学的模型研究了应变速率对780和1000级铁素体-马氏体双相（DP）钢的力学性能和断裂机理的影响。对于被检查的钢，在万能试验机上进行了准静态（0.001 s-1）和中等应变率（0.5-1 s-1）拉伸测试，而高应变率（1500-2500 s-1）进行了测试用Split-Hopkinson拉伸棒进行。此后，进行了使用2D代表性体积元素（RVE）的有限元模拟，以研究微观结构对应变速率变化时DP钢局部变形和损伤的影响。通过使用基于位错的理论和局部化学成分与Johnson-Cook（JC）硬化模型相结合，描述了在不同应变率下观察到的相成分的流动曲线。此外，基于速率依赖的JC失效模型的单个损伤准则被用来描述DP微结构中的局部裂纹机制。研究了变形相的局部应力，应变和破坏发展。发现在低和高应变速率变形下，显微组织特性，特别是相分数对DP钢的应变硬化和延展性有不同的影响。通过RVE模拟预测的两种应变速率下，两种钢的微观结构中的损伤萌生和扩展与实验结果密切相关。

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