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|Title:||Shearographic and holographic assessment of defective laminates with bond-lines of different elasticities|
|Authors:||Shang, H.M. |
|Source:||Shang, H.M.,Tham, L.M.,Chau, F.S. (1995-07). Shearographic and holographic assessment of defective laminates with bond-lines of different elasticities. Journal of Engineering Materials and Technology, Transactions of the ASME 117 (3) : 322-329. ScholarBank@NUS Repository.|
|Abstract:||While defects in laminated plates are readily revealed using double-exposure shearography and holography, when an incremental vacuum pressure is applied between the exposures, the apparent defect size, measured from the boundary of the perturbed fringes, may over-estimate the actual defect size depending on the elasticity of the bond-line. In this paper, the perturbed fringes were described by a mathematical model derived from the theory of thin plates supported by a Winkler type elastic foundation which takes into consideration the elasticity of the bond-line. An iterative technique is subsequently presented for estimating the size and depth of the defect from the fringe pattern without the need to pre-determine the current elasticity of the bond-line. Laminates with a thick and highly elastic bond-line, found in foam-adhesive bonded metal laminates, and those with a thin and brittle bond-line, found in multi-layered glassfibre reinforced plastic plates, were tested. Results have shown that the defects in these laminates were accurately assessed.|
|Source Title:||Journal of Engineering Materials and Technology, Transactions of the ASME|
|Appears in Collections:||Staff Publications|
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