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H. Asaoka,T. Yamazaki,S. Shamoto 한국물리학회 2008 Current Applied Physics Vol.8 No.3,4
We have focused on the stress evolution during initial growth stage of Ge nanodots on H-terminated Si(111) 1×1 and Si(111) 7×7corresponding to a StranskiKrastanow growth mode, when the wetting layer thickness approaches the critical value for three-dimen-sional nucleation. In case of the deposition on H-terminated Si(111) 1×1 surface, the rst Ge sub-bilayer shows tensile stress followedby compressive stress. The unique behavior demonstrates the important role of one atomic layer of H termination to control the intrinsicstress for nanodot fabrication.
Development of a new method for joint damping identification in a bolted lap joint
M. Sanati,Y. Terashima,E. Shamoto,S. S. Park 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.5
Mechanical joints have considerable effects on dynamic behaviour of machine tools; thus, joint damping identification is important in studying the dynamics of mechanical structures. Due to the difficulties in analysis of microslip friction, the experimental prediction of microslip joint dynamics is of great importance. In this study, a new experimental approach is proposed to determine the damping of bolted lap joints. Because of the complex nature of the mechanical joints, the lap joint is isolated through the addition of a mechanical resonator, which consists of a lumped mass and spring, to the bolted structure. The frequency response function (FRF) of this system is used for joint damping identification. This approach is used for bolted structures under both translational and torsional excitations and overcomes difficulties associated with slip boundaries identification in the joint interface. The method is verified by comparing the obtained results with those of the hysteresis loop approach.