TY - GEN
T1 - Influence of surface roughness from additive manufacturing on laser ultrasonics measurements
AU - Bakre, Chaitanya
AU - Hassanian, Mostafa
AU - Lissenden, Cliff
N1 - Publisher Copyright:
© 2019 Author(s).
PY - 2019/5/8
Y1 - 2019/5/8
N2 - Additive manufacturing (AM) is viewed as a revolutionary technique as it offers numerous appealing capabilities such as complex geometries, functionally graded properties, build-upon-demand, repairs, etc. However, in order to attain the full potential of AM, nondestructive testing for quality assurance of AM parts is essential. Laser ultrasound is of particular interest as a nondestructive technique for AM as it provides a viable means of in-situ process monitoring that could ultimately provide feedback for process control. Rayleigh waves generated by a pulsed laser could interrogate the current layer in the AM build and be received by a laser interferometer. The surface roughness is one challenge that must be overcome if Rayleigh waves are to be used for in-situ monitoring. Surface roughness has detrimental effects on the quality of measurements of laser ultrasonics due to factors such as speckle noise, non-uniform reflectivity of the surface, and wave scattering. In this research, we have studied the effects of surface roughness on generation, ultrasonic wave propagation and reception of laser-generated Rayleigh waves. Further investigations on the effects of surface roughness on nonlinear ultrasonic waves are also being carried out.
AB - Additive manufacturing (AM) is viewed as a revolutionary technique as it offers numerous appealing capabilities such as complex geometries, functionally graded properties, build-upon-demand, repairs, etc. However, in order to attain the full potential of AM, nondestructive testing for quality assurance of AM parts is essential. Laser ultrasound is of particular interest as a nondestructive technique for AM as it provides a viable means of in-situ process monitoring that could ultimately provide feedback for process control. Rayleigh waves generated by a pulsed laser could interrogate the current layer in the AM build and be received by a laser interferometer. The surface roughness is one challenge that must be overcome if Rayleigh waves are to be used for in-situ monitoring. Surface roughness has detrimental effects on the quality of measurements of laser ultrasonics due to factors such as speckle noise, non-uniform reflectivity of the surface, and wave scattering. In this research, we have studied the effects of surface roughness on generation, ultrasonic wave propagation and reception of laser-generated Rayleigh waves. Further investigations on the effects of surface roughness on nonlinear ultrasonic waves are also being carried out.
UR - https://www.scopus.com/pages/publications/85066062417
UR - https://www.scopus.com/inward/citedby.url?scp=85066062417&partnerID=8YFLogxK
U2 - 10.1063/1.5099713
DO - 10.1063/1.5099713
M3 - Conference contribution
AN - SCOPUS:85066062417
T3 - AIP Conference Proceedings
BT - 45th Annual Review of Progress in Quantitative Nondestructive Evaluation, Volume 38
A2 - Laflamme, Simon
A2 - Holland, Stephen
A2 - Bond, Leonard J.
PB - American Institute of Physics Inc.
T2 - 45th Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE 2018
Y2 - 15 July 2018 through 19 July 2018
ER -