This study deals with the identification of macroscopic elastic parameters of a layer-to-layer interlock woven composite from a full-field measurement. As this woven composite has a coarse microstructure, the characteristic length of the weaving is not small as compared to the specimen size. A procedure based on an inverse identification method and full-field digital image correlation kinematic measurement is proposed to exploit a three-point bending test on short coupons to characterize the out-of-plane shear modulus. Each step of the proposed procedure is presented, and their respective uncertainty is characterized with the help of numerical simulations. The shear modulus is identified with an accuracy of about 1.5 % and is 15 % lower than the estimate obtained through Iosipescu tests. The proposed procedure shows a correlation between the ideal mesh size and the weaving period. It also reveals that the actual boundary conditions deviate from the ideal ones and hence a special attention is paid to their optimization.

This paper focuses on the identification of homogenized macroscopic elastic parameters on a 3D woven composite, based on Digital Image Correlation and the Finite Element Update Method. One major difficulty consists in handling a rather coarse microstructure. A fine mesh analysis of the kinematics captures both the details of the three point bending test, but also the microstructure induced modulation of the displacement field, which is out-of-reach of a homogenized representation. A compromise, based on an adjustment of the mesh size used for the correlation analysis and the weaving period is shown to be satisfactory.