Multi-scale evaluation of joint part based on local material testing

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Indentation method is applied to materials testing for welding part, joint part of electronic components and thin film materials. These tests can reveals the residual stress and the effect of microstructures on mechanical properties of electronic joint part, and static strength, fatigue strength and anisotropic mechanical properties of thin films. Furthermore, the indentation method is applied to evaluate time-dependent characteristics of high-polymer materials. The results show that the indentation method can evaluate the master curve of viscoelastic characteristics.