Determination of Surface Stress Distributions in Steel Using Laser-Generated Surface Acoustic Waves
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概要
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High frequency surface acoustic waves (SAWs) are excited by a pulsed laser and detected by a specially designed poly(vinylidene fluoride) (PVDF) transducer to investigate surface stress distribution. Two kinds of stressed surfaces are examined experimentally. One is a steel plate elastically deformed under simple bending forces, where the surface stress varies slowly. The other is a welded steel plate for which the surface stress varies very rapidly within a small area near the welding seam. Applying a new signal processing method developed from correlation technique, the velocity distribution of the SAWs, which reflects the stress distribution, is obtained in these two samples with high resolution.
- 2008-05-25
著者
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Lu Jian
Department Of Applied Physics Nanjing University Of Science And Technology
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Ni Xiaowu
Department Of Applied Physics Nanjing University Of Science And Technology
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Shen Zhonghua
Department Of Applied Physics Nanjing University Of Science And Technology
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Shen Zhonghua
Department of Applied Physics, School of Science, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China
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Ni Chenyin
Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China
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Shi Yifei
Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China
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Lu Jian
Department of Applied Physics, School of Science, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China
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Ni Chenyin
Department of Applied Physics, School of Science, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China
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Ni Xiaowu
Department of Applied Physics, School of Science, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China
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