CFRP对称铺层环形法兰连接拉伸刚度计算方法

为计算碳纤维增强复合材料(carbon fiber reinforced plastic，CFRP)对称铺层环形法兰连接的拉伸刚度，基于圆板对称弯曲和经典层合板理论提出一种考虑环向支撑、材料各向异性和撬力作用系数的计算方法。在制备过程中，采用预浸料手工铺设和模压成型的方法成型试件，而后开展了3组不同法兰板厚度（2.2，3.0，3.8 mm）连接件轴向拉伸试验。通过对比理论计算值与试验结果，验证了计算方法的正确性，误差均不大于13.61%。通过理论模型分析影响因素，结果表明：拉伸刚度随法兰板厚度、外径和内径的增大而增大，随螺栓所在的半径变大而减小；改变螺栓位置对于拉伸刚度的提升比改变法兰板内外径更显著，当螺栓位置由90 mm调整至85 mm时，拉伸刚度提升59.54%。

Calculation Method of Tensile Stiffness of Symmetrically Laminated Annular Flange Connection Made of Carbon Fiber Reinforced Plastics

To calculate the tensile stiffness of symmetrically laminated annular flange connection made of carbon fiber reinforced plastics (CFRP), a calculation method considering circumferential support, material anisotropy and prying effect factor is proposed based on the symmetrical bending of circular plate and the classical laminated plate theories. By the way of manual laying and molding of prepreg, the forming of the specimen was realized. Then,the axial tensile tests were carried out on three groups of connections with different flange thickness (2.2,3.0,3.8 mm). The theoretical calculation values were compared with the test results, and the correctness of the calculation method was verified, with the maximum error of 13.61%. The influence factors were investigated by the theoretical model. The results show that the tensile stiffness increases with the increase of flange thickness, outer diameter and inner diameter, and decreases with the increase of bolt position radius. The bolt position shifting is more effective for improving the tensile stiffness than changing the inner and outer diameters of the flange plate. When the bolt position is adjusted from 90 mm to 85 mm, the tensile stiffness is increased by 59.54%.