11:40
Thermal Methods 1
Chair: Umberto Galietti
11:40
20 mins
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INFRARED PHOTOELASTICIMETRY TO STUDY RESIDUAL STRESSES IN SILICON WAFERS
Fabien Jagailloux, Valéry Valle, Jean-Christophe Dupre, Jean-Daniel Penot, Amal Chabli
Abstract: This paper discuss the technical details of a full two dimensional automated infrared polariscope used especially for the measurement of whole field residual stresses inside silicon wafers. The infrared polariscope and his capabilities are introduced. Plane and circular polariscopes are combined to analyse transmitted light by samples. The isoclinic parameter is determined by a FFT method while phase stepping analysis method is used for the calculation of the isochromatic parameter. First results on crystalline silicon are presented to illustrate the possibilities of this method.
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12:00
20 mins
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THERMAL NON-DESTRUCTIVE CHARACTERIZATION AND IN SITU DAMAGE MONITORING OF A COMPOSITE SUSPENSION WISHBONE
Jean-Michel Roche, Françoise Passilly, François-Henri Leroy, Patrick Lapeyronnie, Christian Fagiano
Abstract: This paper illustrates the potential of active and passive infrared thermography for the inspection, characterization and damage monitoring during mechanical testing, of a woven thermoplastic composite wishbone. First, pulse thermography experiments are carried out on the structure, right after its manufacturing process, in order to detect any kind of initial defects and to characterize the woven texture. Then, passive thermography is used to monitor the wishbone under incremental tensile loadings. Thermal data is confronted to the one obtained with other experimental techniques, such as digital image correlation and acoustic emission, in order to provide the most thorough information about damage scenarios. This work is part of a larger project (including CETIM, PSA Peugeot Citroën, and Onera) which ultimately aims at the substitution of the classic steel wishbone arm by a lighter, equivalent thermoplastic structure.
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12:20
20 mins
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THE USE OF IRT AND DIC TECHNIQUES FOR TRACKING SPATIAL HETEROGENEITIES OF THERMOMECHANICAL RESPONSES OF SGFRP6.6 SUBJECTED TO FATIGUE LOADING
Adil Benaarbia, André Chrysochoos, Gilles Robert
Abstract: The purpose of this communication is to shed greater light on the local deformation mechanisms developed within injected-molded 30wt% short E-glass fiber-reinforced polyamide-6.6 (SGFRPA6.6). The study is carried out using full-field measurement techniques: viz. infrared thermography (IRT) and digital image correlation (DIC). The first technique provides heat source fields using the heat diffusion equation, while the second gives access to strain assessments. Several fiber configurations of SGFRPA6.6 are considered in order to track areas susceptible to local failure.
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