Study of the deformation characteristics of window security film by digital image correlation techniques |
| |
Authors: | Wim Van Paepegem Assen A Shulev Ilia R Roussev Stijn De Pauw Joris Degrieck Ventseslav C Sainov |
| |
Institution: | 1. Department of Mechanical Construction and Production, Ghent University, Sint-Pietersnieuwstraat 41, 9000 Gent, Belgium;2. Institute of Mechanics, Bulgarian Academy of Sciences, Bl. 4, Acad. G. Bonchev St., 1113 Sofia, Bulgaria;3. Central Laboratory of Optical Storage and Processing of Information, Bulgarian Academy of Sciences, Bl. 101, Acad. G. Bonchev St., P.O. Box 95, 1113 Sofia, Bulgaria |
| |
Abstract: | This paper presents a speckle-displacement measurement technique based on the digital image correlation to study the notch sensitivity and crack bridging of window security film. It is used to protect existing glazing against hurricanes, blast and terrorist explosions. The window security film is laminated to the interior side of the glass window by means of a special adhesive. When the glass is breaking, the window film keeps all glass fragments together.The proposed sub-pixel registration of the displacement field is achieved using a calculation technique based on the centre of mass localization of the complex spectrum. This approach increases the computational efficiency for displacements smaller than one pixel and performs with high precision when optimal values of the input correlation parameters are used. In order to achieve a high accuracy of the algorithm, optimization of these input image correlation parameters is offered. For larger displacements an iterative procedure which preserves the precision is successfully implemented.The speckle pattern is created by small white dots sprayed on the previously black painted film surface. As a result, white light illumination can be used which significantly simplifies the experiments. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|