Deformation And Warping In Magnetic Tapes By Laser Speckle Technique
Abbreviated Journal Title
J. Elastomer Plast.
Surface; Materials Science, Multidisciplinary; Polymer Science
Laser speckles appear as a pattern of fine randomly distributed dots resulting from multiple interference when an optically ''rough'' surface is illuminated by a coherent laser beam. By photographing a speckle pattern, the positions of all points on a surface are ''fingerprinted'' and any changes in position can be detected with high sensitivity. Such speckle patterns can be used as a non-contact, nondestructive, quantitative tool to measure in-plane deformations in magnetic tapes subjected to tension. Because such tapes not only stretch but also warp, the obtained data reflect the projection of the deformation vector in the longitudinal plane of the tape. By geometrical relations, all three components of the deformation vector at any point of interest can be determined. This article presents data that were obtained for a commercial computer data cartridge tape (40 Mb Format). It is shown that with such data, stress-strain relations can be established and the overall deformation behavior of the material can be understood.
Journal of Elastomers and Plastics
"Deformation And Warping In Magnetic Tapes By Laser Speckle Technique" (1993). Faculty Bibliography 1990s. 902.