Abstract

The complex of methods necessary to experimentally study the effect of the deformation rate on the high strength sheet steels (as exemplified by DP780, DP980, and BH240 steels) on the increase in their plasticity during uniaxial and biaxial stretching is determined. The deformation rates of steels were measured in a wide range from 10^–4 to 17 × 10³ s^–1. An FP 10/1 HECKERT tensile testing machine, a P6324 hydraulic press with special tools, a Hopkinson–Kolsky machine and a T1226B electro-hydraulic press were used. The deformations of the materials destructed during the biaxial stretching were defined using a control grid on their surfaces. Dependences of the destruction deformations of DP780, DP980, and ВН240 steels vs. the deformation rate and their stress-strain state showing an increase in plasticity of DP780 steel up to 2.9 were determined.

中文翻译：

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取决于变形率的高强度钢板变形变形的定义方法

摘要

确定了通过实验研究变形速率对高强度钢板（以DP780，DP980和BH240为例）对单轴和双轴拉伸过程中塑性增加的影响所必需的方法的复杂性。在10 ^–4到17×10 ³ s ^–1的宽范围内测量钢的变形率。使用了FP 10/1 HECKERT拉伸试验机，带专用工具的P6324液压机，Hopkinson-Kolsky机和T1226B电动液压机。在双轴拉伸过程中破坏的材料的变形是使用其表面上的控制网格定义的。确定了DP780，DP980和ВН240钢的破坏变形与变形率及其应力-应变状态之间的关系，表明DP780钢的塑性提高到2.9。