2017년도 이전 세미나
Laser-induced elastic waves in a semi-infinite domain
|Category||T-seminar series III|
|날짜||2008-05-14||시간||22:10:00 ~ 22:10:00|
|TOPIC||Laser-induced elastic waves in a semi-infinite domain|
|소개 및 안내사항||
T-seminar series III
일정: 5월 14일 수요일 2:30-3:30 / May, 14 (Wed)
장소: 수리과학관 404호 / Math. Sci. Building Room 404
발표자: 장봉수 박사 / Dr. Bongsoo Jang
제목: Laser-induced elastic waves in a semi-infinite domain
초록: Thermo-elastic waves generated by a pulsed laser in solid is of great interest due to the extensive applications of pulsed laser technologies in material processing and non-destructive detecting test(NDT) and characterization.
Since wavelength of ultrasonic waves is smaller than the usual size of defect, the method using ultrasonic waves generated by a laser can detect the presence of small defects. Lasers are capable of producing ultrasonic waves very accurately and have an advantage of producing high intensity power and directionality. Thus, the method of a pulsed laser is being commonly used to generate ultrasonic waves for NDT.
In this study, one dimensional analytical and numerical investigation of laser generate elastic waves in a semi-infinite solid strap is presented. Assuming uncoupled thermo-elasticity theory, analytic solutions for the thermal and the mechanical equations are obtained by the Laplace transform techniques. Laser interaction with a solid specimen is studied when the optical absorption coefficient varies. A weaker displacement is observed for a large absorption coefficient. Numerical approximated solutions are compared with the analytical solutions.
Contact: Bongsoo Jang ( email@example.com, 279-8035)