Prefabricated defects of polymer (PVC) sheet specimens are tested in uniaxial tension to be broken.There are two deforming stages from elastic to viscoplastic yield in whole deformation process of specimen.In this process the temperature varying data on specimen' s surface are real timely recorded by a thermal infrared imager.The corresponding analysis results show that the surface temperature emerges an elastic cooling phenomenon in sample' s elastic deformation stage (areas) and reversely temperature increases sharply in its viscoplastic ...
