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Strain - deformation reconstruction of CFRP laminates based on Ko displacement theory

ABSTRACT The deformation of Carbon Fibre Reinforced Polymer (hereafter referred to as CFRP) will affect the reliability and safety of products when it is applied in the fields of aeronautics & astronautics and military, and it can provide a basis for assessing the safety performance of structures by monitoring the deformation of CFRP laminates real time. In this paper, the CFRP laminates are taken as the research object, the CFRP laminate structures model is established in the finite element analysis software ABAQUS, the load is applied, the strain value is obtained, the deflection of model is reconstructed based on the Ko displacement theory, and it is compared with the deflection obtained by the simulation. Furthermore, the test pieces of CFRP laminates are designed and prepared, the experimental system is established, the FBG sensors are used to collect the strain information, and the deflection is reconstructed based on the Ko displacement theory and compared with the measured deflection, to respectively obtain the RMS error of 0.5483 mm and 0.8515 mm between the reconstructed deflection and the measured deflection of test pieces. It is concluded that the Ko displacement theory can be applied for the deformation reconstruction of CFRP laminates.