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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力学性能。然而，测量的性能可能与试样的几何因素有关，尤其是高强度钢；这使得属性的定义和比较变得困难。本研究对超高强度热冲压钢进行了一系列拉伸试验；修改了几何形状和尺寸以及切割方向。结果表明，热冲压件是各向同性的，切削方向对其没有影响；测得的强度实际上与试样几何形状无关，包括尺寸和形状。在研究范围内，拉伸与样品尺寸略有相关，但高度依赖于由系数K表示的样品形状。根据微观结构观察和断口形貌，对此类现象进行了分析和讨论。此外，为了验证其适用性，引入了两种广泛使用的伸长转换方程奥利弗公式和巴尔巴定律，并开发了一种新的插值函数，并对其进行了比较。

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