Out-of-plane strain measurement in sandwich plates with single fully potted insert by using digital shearography

The construction and operation of digital shearography (DS) applied to sandwich plates with a single fully potted insert have been presented. The proposed DS has the advantage of full-field and non-destructive testing, that can measure tiny out-of-plane strain in the elastic region without wasting specimen. For validation purposes, analytical solution analysis (ASA) stemming from our previous study [S. J. Huang, L. W. Chiu, M. T. Kao (2004) Structural Analysis of Sandwich Plates with Inserts - Five Layers Theory, Proc. 2004 AASRC/CCAS Joint Conf.] was conducted. By comparing the results of DS and ASA strain fields throughout the sandwich surface a convincing agreement is revealed, thus successfully showing the full-field strain measurement of the single fully inserted sandwich plates using DS.