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23 March 2015 Towards a micro-mechanics based understanding of ultrasonic higher harmonic generation
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The need for micro-mechanics based understanding leading to meso-scale models for understanding relation between microstructure and ultrasonic higher harmonic generation is emphasized. Three important aspects of material behavior, namely tension-compression asymmetry, shear-normal coupling and deformation induced anisotropy that are relevant to ultrasonic higher harmonic generation are identified. Of these, the role of tension-compression asymmetry in micro-scale material behavior on ultrasonic higher harmonic generation is investigated in detail. It is found that the tension-compression asymmetry is directly related to ultrasonic even harmonic generation and an energy based measure is defined to quantify the asymmetry. Using this energy based measure, a homogenization based approach is employed to quantify the acoustic nonlinearity in material with micro-voids and the findings are discussed.
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Vamshi Krishna Chillara and Cliff J. Lissenden "Towards a micro-mechanics based understanding of ultrasonic higher harmonic generation", Proc. SPIE 9438, Health Monitoring of Structural and Biological Systems 2015, 94380R (23 March 2015);

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