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首页> 外文期刊>Journal of Materials Engineering and Performance >Size Effect Studies on Tensile Tests for Hot Stamping Steel
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Size Effect Studies on Tensile Tests for Hot Stamping Steel

机译：耐热冲压钢拉伸试验的尺寸效应研究

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摘要

Tensile tests have been widely used to determine basic mechanical properties of materials. However, the properties measured may be related to geometrical factors of the tested samples especially for high-strength steels; this makes the properties' definitions and comparisons difficult. In this study, a series of tensile tests of ultra-high-strength hot-stamped steel were performed; the geometric shapes and sizes as well as the cutting direction were modified. The results demonstrate that the hot-stamped parts were isotropic and the cutting direction had no effect; the measured strengths were practically unrelated to the specimen geometries, including both size and shape. The elongations were slightly related to sample sizes within the studied range but highly depended on the sample shape, represented by the coefficient K. Such phenomena were analyzed and discussed based on microstructural observations and fracture morphologies. Moreover, two widely used elongation conversion equations, the Oliver formula and Barba's law, were introduced to verify their applicability, and a new interpolating function was developed and compared.
机译：拉伸试验已被广泛用于确定材料的基本机械性能。然而，测量的性质可能与测试样品的几何因子有关，特别是对于高强度钢;这使得属性的定义和比较困难。在本研究中，进行了一系列超高强度热冲压钢的拉伸试验;修改了几何形状和尺寸以及切割方向。结果表明，热冲压部件是各向同性的，切割方向没有效果;测量的强度实际上与样品几何形状无关，包括尺寸和形状。伸长率与所研究范围内的样品尺寸略微相关，但是由系数K表示的样品形状高度依赖于样品形状。基于微观结构观察和骨折形态分析并讨论这种现象。此外，引入了两个广泛使用的伸长率转换方程，奥利弗公式和芭芭定律，以验证其适用性，并开发了新的内插功能。

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