Akira Kawasaki1, Ryuzo Watanabe1, Heihachi Shimada1 and Hideo Suzuki2
1Department of Materials Processing, Faculty of Engineering, Tohoku University, Sendai
The strain distribution across jointed interface of metals and ceramics has been studied by speckle photography, by which a small strain of the order of 10-4 mm/mm with a gauge length less than 0.5 mm can be detected. Samples of molybdenum/silicon nitride and steel/copper/silicon nitride joints were tested under static compression at room temperature and thermal free-expansion heating up to about 573 K in air. The finite element calculation (FEM) was also made for thermal deformation. As a result, the applicability of speckle photography to determination of strain distribution across jointed interface of metals and ceramics was confirmed, and the results of the thermal strain measurement by speckle photography coincided well with those of thermal deformation analysis by FEM in the region of this study.
laser, speckle photography, ceramics, bonding, local deformation, thermal expansion, thermal strain, jointed interface, interlayer, finite element method, slicon nitride, molybden, carbon steel
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