Compressive Stiffness Calculation Method for CFRP Bilateral Flexible Flange
The stiffness calculation method for bilateral flexible flanges of carbon fiber reinforced poly-mer(CFRP)is proposed based on the comprehensive principle and modified comprehensive principle of composite materials mesomechanics.The equivalent material property parameters of complex laminated flanges are derived from three-dimensional elastic theory.According to the deformation coordination condi-tions of the flange root,the calculation formula of the compressive stiffness of the flange is derived by using the approximate differential equation of beam bending.To analyze and validate the theoretical model of compressive stiffness,finite element models of three sets of flanged pipe specimens were established based on existing laminated flanges.The end of the pipe body was subjected to a uniformly distributed pressure to solve for the axial compressive displacement at the root of the flange,thereby obtaining the com-pressive stiffness.The results show that,under the same flange material property and the same load,the thicker the flange,the smaller the compression stiffness value.The compressive stiffness value obtained by the finite ele-ment model increases slightly at the initial stage and becomes stable when the compressive stress reaches about 30 MPa.The compressive stiffness value calculated by the theoretical model does not vary with the load.The error between the finite element model and the theoretical model of the three groups of specimens is within 4%,which indicates the compressive stiffness calculation method of CFRP bilateral flexible flange is correct and feasible.
NETL
NSTL
万方数据
维普
