Technical Session - 5

Title:            The effect of uniaxial stress on material properties change of Aluminium sample
Authors:       Nguyen Le Van, Nguyen Hoai
Abstract:     The stress state affects to material properties, the Elastic modulus and Poisson’s ratio decrease under tensile stress. In this research, we study the effect of uniaxial stress to material properties change in Aluminum sample. The Laser ultrasound technique (LUT) is used to generate ultrasound wave propagating in medium under different level stress. The wave velocity is depend on the type of material, fatigue, temperature and stress state. The ultrasound wave velocity increases under tensile stress and vice versa. We use the transducer to get waveform signal, B-scan domain. The dispersive curve of ultrasound wave is received by using Fast Fourier transform (FFT) to analyse B-scan signal. The particle swarm optimization algorithm (PSO) is used to invert the dispersive curve to obtain the material properties under different level uniaxial stress.

Keywords:   Material properties, Fast Fourier Transform, Elastic modulus, Poisson’s ratio, Laser ultrasound technique, Particle swarm optimization
Pages:         271-274

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