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首页> 外文期刊>Journal of Materials Engineering and Performance >Semiempirical Formulae for Mechanical Properties Controlled by Strength and Ductility of Power-Law Hardening Metallic Materials
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Semiempirical Formulae for Mechanical Properties Controlled by Strength and Ductility of Power-Law Hardening Metallic Materials

机译：由动力法淬火金属材料强度和延展性控制的机械性能半血流公式

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摘要

Some subordinate mechanical properties, such as the strain hardening exponent (n) and the fracture true stress (sigma(f)), are not available in general material property handbooks, although they are important in choosing materials. This paper investigated the relations between the subordinate mechanical properties to the basic ones for power-law hardening materials. Our semiempirical analysis shows that, in uniaxial tensile experiment, the strain hardening exponent is controlled by the ratio of the yield strength (sigma(s)) and the ultimate tensile strength (sigma(b)), and the value also equals to the maximum uniform strain. The absolute calculation errors of n on various metal materials are approximately within +/- 0.03. Physically, n expresses the ability of the strength rising from the yield strength to the ultimate tensile strength during uniform deformation; it may also denote the maximum ability of uniform deformation before necking. The fracture strength is controlled directly by n, sigma(b) and the reduction in area (psi(K)) in our concise expression. The relative errors of the fracture strength between the calculations and the measurements on metal materials are approximately within 20%. Results also indicate that the fracture true stress represents the increased stress during uniform deformation plus the concentrated stress caused by necking.
机译：在一般材料特性手册中，一些从属力学性能，例如应变硬化指数（n）和裂缝真应力（Sigma（F）），但它们在选择材料方面很重要。本文调查了电力法硬化材料基本力学性能之间的关系。我们的半透明分析表明，在单轴拉伸实验中，应变硬化指数由屈服强度（Sigma）和最终拉伸强度（Sigma（B））的比率控制，并且该值也等于最大值均匀的菌株。各种金属材料上的N的绝对计算误差大约在+/- 0.03内。物理上，N表示在均匀变形期间从屈服强度升高到最终拉伸强度的能力;它还可以表示缩颈前均匀变形的最大能力。在我们的简明表达中，将断裂强度直接由n，sigma（b）和区域（psi（k））控制。计算和金属材料的测量之间的断裂强度的相对误差大约在20％以内。结果还表明，裂缝真应力表示均匀变形期间的应力增加加上颈缩引起的浓缩应力。

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