Experimental studies on elastic cooling and pyromagnetic effect of polyvinyl chloride sheets with defects

Yingshe Luo; Shengming Chen; Liang Zhang; Jianxin Su; Yongzhong Zhang; Shuling Luo

Korea-Australia Rheology Journal, Vol.24, No.3, 205-210, September, 2012

DOI10.1007/s13367-012-0025-y Export Citation

Experimental studies on elastic cooling and pyromagnetic effect of polyvinyl chloride sheets with defects

Yingshe Luo^†, Shengming Chen, Liang Zhang, Jianxin Su¹, Yongzhong Zhang², and Shuling Luo³

Institute of Rheological Mechanics and Material Engineering, Central South University of Forestry and Technology, Changsha 410004, Hunan, China
¹College of Information Technology, Xiangtan University, Xiangtan 411105, Hunan, China
²College of Computer and Information Technology, Central South University of Forestry and Technology, Changsha 410004, Hunan, China
³School of Business, Central South University of Forestry and Technology, Changsha 410004, Hunan, China

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Polyvinyl Chloride (PVC) sheets were made into samples with precast defects for uniaxial tensile test. The tests are carried out under room temperature with conditions of same displacement rate but different defect sizes or of same defect but different displacement rates. The local nonuniform temperature field on whole deformation area of specimen is recorded with a thermal infrared imager and the whole coupling magnetic field with thermal changes in experiments is detected and measured by a self-developed sensors system. The experimental results show that, in a complete tensile test process of PVC samples, the temperature reduction phenomenon emerges firstly in its elastic deformation stage (areas) that temperature of specimen is cooler than room temperature. And then in viscoplastic deformation period (areas), the temperature increases sharply to be obviously higher than room temperature due to the thermo-mechanical coupling effection of tensile load and viscoplastic deformation heat. These thermal variations lead a coupling pyromagnetic effect occur and the effect intensity is dependent strongly on the strain rate and/or the size of defects. The temperature prejudgment conditions for materials yield are preliminary discussed based on this effect.

Keywords:PVC sheet;polymer;pyromagnetic effect;viscoplastic deformation;thermo-mechanical coupling properties;temperature yield condition

[References]

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[1] Cheng ZF, J. of Southwest China Normal University., 25, 253 (2000)

[2] Luo WB, Experimental studies on the evolution of defect temperature field during deformation of ABS, IUTAM Symp. on Rheology of Bodies with Defects (Wang, R. Ed)，Kluwer Acad. Publ.，DORDRECHT/BOSTON/LONDON, 109 (1999)

[3] Luo WB, Yang TQ, Li ZD, Yuan LW, Int. J. Solids Structures., 37, 887 (2000)

[4] Luo YS, Su JX, Zhang YZ, Deng XH, Chen SM, Deng RJ, Yang ZY, Ma MW, Experimental Research on Pyromagnetic Effect of PVC Sheet, AIP Conference Proceedings [C]. Edited by CO A, Leal LG, Colby RH, Giacomin AJ, American Institute of Physics, New York, 1027, 1417 (2008)

[5] Sih GC, Theoret. Appl. Fracture Mech., 4, 158 (1985)

[6] Sih GC, Thermal/mechanical interaction associated with the micro-mechanisms of material behavior, Institute of Fracture and Solid Mechanics, Lehigh University Technical Report, 178 (1987)

[7] Sih GC, Advances in Mechanics., 19, 159 (1989)

[8] Su JX, Luo YS, Zhang YZ, Deng XH, Chen SM, Zhang L, Instrument Technique and Sensor., 6, 81 (2010)

[9] Yang ZY, Luo YS, Su JX, Zhang YZ, Deng XH, Chen SM, Deng RJ, Ma MW, Zhang L, J. of Central South University of Technology., 15, 568 (2008)

[10] Yuan LW, Swartz SE, Hu KK, The phenomena, Kansas State Univ. Publ., Kansas. (1990)

[11] Yuan LW, Zhi RB, Natural Science Journal of Xiangtan University., 14, 44 (1992)

[12] Yuan LW, Zhi RB, Li ZD, Fundamentals of Rheological Fracture (in Chinese), National defence industry press, Peking. (1992)

[13] Yuan LW, Rheology of Bodies with Defects (in Chinese), National defence industry press, Peking. (1994)

[14] Yuan LW, The Rupture Theory and Application of Rheological Materials with Defects (in Chinese), Science Press, Peking. (2001)

[15] Zhang YZ, Luo YS, Su JX, Ma MW, Yang ZY, Zhang L, J. of Central South University of Technology., 15, 229 (2008)