Experimental Assessment of Bend-Twist Coupling Potentials of Composite Materials via Digital Image Correlation Method

摘要

Bending-twisting behavior of composite materials are determined through a comparative study via the Digital Image Correlation (DIC) system and the finite element analyses, and the outcome of the numerical and experimental study is utilized to form a basis on the selection of material and fiber angle configuration for wind turbine blade designs with the purpose of load mitigation. Experimental and numerical study of the bending twisting coupling behavior of composite materials is performed on composite plates and box beams which simulate the flange region in wind turbine blades. Preliminary experimental and numerical studies showed that CFRP material has higher bend-twist coupling potential than the GFRP material and it can be used in the spar cap regions to provide the necessary blade stiffness as well as load reduction through the bending twisting coupling effect.