Mixed stress-displacement finite element method for laser-generated ultrasound

XU Baiqiang; LIU Hongkai; XU Guidong; XU Chenguang; LI Junmin

doi:10.7510/jgjs.issn.1001-3806.2014.02.018

In order to study the generation and propagation of laser-generated ultrasound in isotropic semi-infinite aluminum material, a laser-generated ultrasound in an arbitrary elastic semi-infinite medium model was established by using mixed stress-displacement finite element method and perfectly matched layer(PML). The transient wave snapshots and surface normal displacement waveforms in semi-infinite aluminum materials were obtained. The surface normal displacement waveforms were compared with the same geometrical finite element model. The results show that the mixed stress-displacement finite element method can effectively eliminate reflection waves from truncated boundary, and simulate the generation and propagation of ultrasound in semi-infinite solid material accurately. The simulation results provide an effective method for research of the laser-generated ultrasound waves in micro-nanostructure by picosecond or femtosecond laser irradiation.

Mixed stress-displacement finite element method for laser-generated ultrasound

1. Faculty of Science, Jiangsu University, Zhenjiang 212013, China;

2. School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China

Received Date: 2013-04-11

Accepted Date: 2013-04-23

Available Online: 2014-02-25

Abstract: In order to study the generation and propagation of laser-generated ultrasound in isotropic semi-infinite aluminum material, a laser-generated ultrasound in an arbitrary elastic semi-infinite medium model was established by using mixed stress-displacement finite element method and perfectly matched layer(PML). The transient wave snapshots and surface normal displacement waveforms in semi-infinite aluminum materials were obtained. The surface normal displacement waveforms were compared with the same geometrical finite element model. The results show that the mixed stress-displacement finite element method can effectively eliminate reflection waves from truncated boundary, and simulate the generation and propagation of ultrasound in semi-infinite solid material accurately. The simulation results provide an effective method for research of the laser-generated ultrasound waves in micro-nanostructure by picosecond or femtosecond laser irradiation.

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Reference (15)

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Mixed stress-displacement finite element method for laser-generated ultrasound

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