14 G. Corvec et al. surface. The methodology to identify intrinsic dissipation is given. The validation of this methodology at ambient temperature is a first step towards the use of thermal field measurements on glassy materials at temperatures close to glass temperature transition. 3.2 Experimental Setup 3.2.1 Specimen Geometry and Testing Conditions The material considered here is a soda lime glass. The sample, presented in Fig. 3.1 corresponds to a disc of 2.1 mm in thickness and 29.7 mm in diameter with three elliptical holes. The major and minor axis lengths are respectively 6 and 3 mm. The holes are oriented in relation to each other according to the major axis with an angle of 120ı. The centre of the holes are 6 mm far from the disc center. The holes were cut with a water jet cutting machine. During the mechanical test, one of the holes was oriented with an angle of 27.91ı according to its major axis and the loading axis. The disc was submitted to cyclic compressive loading by means of a 5543 Instron testing machine. An overview of the experimental setup is given in Fig. 3.1. The test was conducted under a prescribed periodic triangular signal. The minimum and maximum values of the compression force are 5 N and 520 N, respectively. The sample was submitted to ten cycles at a frequency of 2.9 Hz. Fig. 3.1 Overview of the experimental setup
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