An infrared detector system was introduced into the apparatus of the split Hopkinson pressure bar. Real-time temperature of the dynamic deformed specimens of pseudo-elastic TiNi alloy and aluminium alloy was measured with calibrated curves of temperature and voltage. The temperature results varied significantly. During loading, the temperature of two kinds of materials kept to rise. The main difference of temperature evolution of two kinds of specimen appeared during unloading. For specimen of aluminium alloy, temperature during unloading kept constant as the maximum temperature during loading. In contrast, temperature of specimen of TiNi alloy decreased significantly. The difference of temperature evolution of specimens reflects that there are different mechanisms of deformation and temperature variation for two kinds of materials. The measured temperature in the infrared method was in good agreement with the temperature calculated by the principle of energy conservation. It means that the infrared method is adaptable for real-time measurement of transient temperature.
Hodowany J. On the conversion of plastic work into heat[D]. California Institute of Technology, 1997.
[2]
Mason J J, Rosakis A J, Ravichandran G. On the strain and strain rate dependence of the fraction of plastic work converted into heat: An experimental study using high-speed infrared detectors and the Kolsky bar[J]. Mechanics of Materials, 1994, 17(2/3): 135-145.
Marchand A, Duffy J. An experimental study of the formation process of adiabatic shear bands in a structural steel[J]. Journal of the Mechanics and Physics of Solids, 1988, 36(3): 251-283. doi: 10.1016/0022-5096(88)90012-9
[5]
Zehnder A T, Rosakis A J. Temperature rise at the tip of dynamically propagating cracks: Measurements using high-speed infrared detectors[C]. Experimental Techniques in Fracture. New York: VCH Publishers Inc, 1993: 125-169.
[6]
Guduru P R, Zehnder A T, Rosakis A J, et al. Dynamic full field measurements of crack tip temperatures[J]. Engineering Fracture Mechanics, 2001, 68(14): 1535-1556. doi: 10.1016/S0013-7944(01)00045-5
Xia Yuan-ming, Rao Shi-guo, Yang Bao-chang. An infrared transient temperature measuring apparatus and its application to the tensile impact testing[J]. Journal of Experimental Mechanics, 1990, 5(2): 170-177. http://www.cqvip.com/QK/91138X/199002/356010.html
[8]
Jy R D.红外系统原理[M].北京: 国防工业出版社, 1975.
[9]
Duffy J, Cambell J D, Hawley R H. On the use of the torsional Hopkinson bar to study rate effects in 1100-0 Aluminum[J]. Journal of Applied Mechanics, 1971, 38(1): 83-92. doi: 10.1115/1.3408771
[10]
Li Z, Lambors J. Dynamic thermomechanical behavior of fiber reinforced composites[J]. Composites, 2000, 31: 537-547. doi: 10.1016/S1359-835X(99)00102-5
DownLoad:
