Measurement of transient temperature at super-high-speed deformation
Measurement of transient temperature at super-high-speed deformation
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DOI：
10.1016/j.ijmecsci.2021.106626
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发表时间：
2021-07-10
影响因子：
7.3
通讯作者：
Iwamoto, Takeshi
中科院分区：
文献类型：
--
作者：
Gao, Chong;Iwamoto, Takeshi
为了评价材料在高应变率下的热行为，广泛采用热电偶和红外探测器测量10（3）s（-1）应变率范围内的温升。然而，在测量超过10（4）s（-1）的应变速率的温度升高方面很难找到挑战。在此，将尖端直径为80 μ m的T型热电偶和红外探测器引入到基于分离式霍普金森压杆技术的小型化测试装置中，该装置用于实现10（4）s（-1）的应变速率以测量材料的温升。基于Hopkinson压杆中应力波的传播，讨论了热电偶和红外探测器的响应特性。然后，热电偶和红外探测器的适用性进行了讨论，通过比较使用商业软件和理论计算的有限元模拟得到的结果。因此，这两种技术都具有高响应性，并且可以应用于测量10（4）s（-1）应变速率范围内的温升。
To evaluate the thermal behaviour of the materials at high strain rate, the thermocouple and infrared detector are widely employed for measuring the temperature rise in the strain rate range of 10(3) s(-1). However, it is hard to find challenges on measuring the temperature rise over 10(4) s(-1) of the strain rate. Here, both the type-T thermocouple with 80 it m in tip diameter and the infrared detector are introduced into a miniaturized testing apparatus based on the split Hopkinson pressure bar technique which is employed to achieve 10(4) s(-1) of the strain rate for measuring the temperature rise of the materials. The responsiveness of thermocouple and infrared detector is discussed based on the stress waves propagating in Hopkinson pressure bars. Then, the applicability of the thermocouple and infrared detector is also discussed by comparing the results obtained by a finite element simulation using commercial software and theoretical calculations. As a result, both the techniques have a high responsiveness and can be applied to measure the temperature rise in the strain rate range of 10(4)s(-1).