A novel method for measuring temperature and conducting tensile tests of metallic wires at elevated temperatures is presented. Ohmic heating is used to elevate the sample temperature with a uniform distribution, which could vary from room temperature to its melting point. The temperatures of the wires in steady states are determined by using a heat transfer model without measuring directly by thermometers, which reduces the error introduced by contact temperature measurement or optical pyrometers. This technique for temperature measurement can be applied to measuring temperature-dependent electrical resistivity and conducting temperature-dependent tensile tests of metallic materials. A low-cost instrument was designed to conduct the tensile tests. In this work, temperature-dependent Young’s modulus, tensile strength at break, and the steady-state creep rate of 99.994%-pure Pb wires were further determined as applications of the tensile tests. The results show that the proposed method is valid and very useful for conducting temperature-dependent tensile tests of metallic materials.

中文翻译：

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无温度计金属材料温变拉伸试验新方法及仪器

提出了一种在高温下测量温度和对金属线材进行拉伸试验的新方法。欧姆加热用于提高具有均匀分布的样品温度，该温度可以从室温变化到其熔点。稳定状态下导线的温度是通过使用传热模型确定的，而不是通过温度计直接测量，这减少了接触式温度测量或光学高温计引入的误差。这种温度测量技术可用于测量与温度相关的电阻率和对金属材料进行与温度相关的拉伸试验。设计了一种低成本仪器来进行拉伸测试。在这项工作中，温度相关的杨氏模量、断裂拉伸强度、99.994% 纯铅线的稳态蠕变率作为拉伸试验的应用进一步确定。结果表明，所提出的方法是有效的，对金属材料的温度相关拉伸试验非常有用。