Measurement of residual stresses in laminated polymer composites using the digital image correlation and incremental hole drilling methods

In this paper, by using the digital image correlation (DIC) as an optical method and theincremental hole drilling method, residual stresses in laminated polymer composites have been studied. Inprevious studies, the rosette strain gauge has been used to measure the released strain values around the edgeof the hole. The released strain gradients around the hole are too intense and strain gauges are located in adistance far from that location. Therefore, the measured strains are a rough average value of an intensevariation of strain under the strain gage area. In this study, strain values released in close areas of the holewere measured by using DIC method. For compare the results, the available results by the ClassicalLamination Theory (CLT) provided. The good similarity of the order of the residual stress results betweenDIC and CLT methods has been found.

Measurement of residual stresses in laminated polymer composites using the digital image correlation and incremental hole drilling methods Keywords:

Laminated Composites , Residual Stresses , Incremental Hole-Drilling Method , Digital Image Correlation , Classical Lamination Theory