A Method for Identifying Transverse and Thickness Compressive Modulus of Glass Fiber Reinforced Composites Based on DIC

Abstract

In this paper, the short beam shear (SBS) test combined with digital image correlation (DIC) and finite element model updating (FEMU) method is conducted for identification the constitutive parameters of unidirectional composite laminates by minimizing the objective function which is established based on the variance of measured strain and numerical calculated strain. This method has the advantages of insensitive to initial value and high identification efficiency. By changing the test parameters, specimens with different principal planes were used in the SBS test and different failure modes achieved. The standard deviation of E22C and E33C was 8.47% and 3.58% respectively. The comparison of the identification results of the same batch of specimens, different principal planes, different failure modes and different ROI shows that the results of constitutive identification using the area directly under the indenter is reliable.