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Plasticity Aspects of Rough Surface Flattening
Biwa, Shiro,Larsson, Joachim,Storakers, Bertil 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.3
Flattening behaviour of rough surfaces is studied accounting for inelastic deformation of asperities distributed on the surface. A consistent micromechanical framework is described which includes a rigorous analysis of plastic deformation of a single asperity followed by a micro-macro linking theory relating the local asperity compliance to its global counterpart of nominal pressure and approach distance. The local analysis rests on recent computational advances where results for a wide range of strain-hardening plastic materials have been condensed in concise formulae. An illustration is given where flattening of rough surfaces by normal loading is determined using a statistical topography description and discussed for fractal theory as well.
Nonlinear Ultrasonic Characterization of Lamb Wave in a Plate with Contacting Interfaces
Satoshi Kishiwada,Shiro Biwa,Claude Inserra,Eiji Matsumoto 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Linear and nonlinear propagation characteristics of the lowest-order anti-symmetric-mode (A0-mode) Lamb wave are investigated experimentally for a thin aluminum plate compressed between two aluminum blocks underdifferent pressures. The wave-packet propagation behavior as well as the harmonic generation behavior are examinedbased on the short-time Fourier transform of the observed waveforms. The results show that the applied pressure influences the dispersive nature of Lamb wave, and brings about the occurrence of higher harmonics, especially odd-order harmonics, in a certain intermediate range of contact pressure. Such features can be utilized for nondestructive diagnosis of the interface contact conditions.