MEASUREMENT OF THE STRESS FOR COMPOSITE JOINTS WITH A PINHOLE USING THE MOIRE INTERFEROMETRY

For the first time,the moue interferometry is applied to measure the displacement field for composite joints with a pinhole. The moire pattern is used to determine the strain on the horizontal section through the pinhole centre by displacement derivative method. Based on the rectilinear normal assumption and the reduced stiffness matrix of laminates,the average stress distribution on the sections is calculated and the relative error of the experiment results is less than 6%.This rcmarch demonstrates that the moire interferometry is an efficient experimental technique for the strain and stress measurement of composite joints.