Torsional characteristics and failure mechanism of composite drive shafts formed by variable-angle winding
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摘要: 基于非测地线缠绕和纤维滑移理论,提出采用非测地线缠绕成型一体化复合材料传动轴。设计了多组不同比例纤维变角度过渡区复合材料传动轴,并利用有限元分析和扭转实验深入研究了传动轴的扭转性能及其失效机制。结果表明,含有的变角度过渡区比例越大,传动轴扭转性能越好,过渡区从20%提高到80%,传动轴的失效载荷提高111%,峰值载荷提高90.7%。随着过渡区占比的提高,屈曲形变导致的损伤失效得到有效缓解,损伤扩展角度降低了54.5%。结合有限元仿真和扭转实验分析可知,过渡区纤维角度的增加抑制了屈曲形变,减少了分层损伤带来的界面上力学传导失效,提高了轴管承载能力。Abstract: Based on the theory of non-geodesic winding and fiber slippage, it was proposed to use non-geodesic winding to form integrated composite drive shafts. Multiple groups of variable-angle composite drive shafts with different proportions of transition zone were designed, and the torsion performance and failure mechanism of the drive shafts were deeply studied by finite element analysis and torsional experiment. The results show that the greater the proportion of the transition zone with variable angles, the better the torsional performance of the drive shafts. The transition zone increases from 20% to 80%, the failure load of the drive shafts increases by 111%, and the peak load increases by 90.7%. With the increase in the proportion of the transition zone, the damage failure caused by buckling deformation is effectively alleviated, and the damage angle is reduced by 54.5%. According to the finite element simulation and torsional experiment analysis, it can be concluded that the increase of the fiber angle in the transition zone suppresses the buckling deformation and reduces mechanical conduction failure on the interface caused by delamination damage. As a result, it improves the bearing capacity of the drive shafts.
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图 10 复合材料传动轴有限元(FEA)模型
Figure 10. Model of finite element analysis (FEA) of composite drive shaft
U1—Translational degrees of freedom in the X direction; U2—Translational degrees of freedom in the Y direction; U3—Translational degrees of freedom in the Z direction; UR1—Rotational degrees of freedom in the X direction; UR2—Rotation degrees of freedom in the Y direction; UR3—Rotational degrees of freedom in the Z direction
表 1 不同缠绕工艺参数的变角度缠绕稳定性
Table 1. Variable-angle winding stability of different parameters in filament winding process
Winding angle/(°) 55 45 35 25 15 5
Proportion/%20 □ □ □ □ × × 40 □ □ □ □ □ × 60 □ □ □ □ □ × 80 □ □ □ □ □ □ Interval angle/(°) 10 □ □ × × × × 7 □ □ □ × × × 5 □ □ □ □ × × 3 □ □ □ □ □ × 2 □ □ □ □ □ □ 1 □ □ □ □ □ □ Initial angle/(°) 65 □ □ □ □ × × 70 □ □ □ □ □ × 75 □ □ □ □ × × 80 □ □ □ × × × Notes: □—Without slip; ×—Slip. 表 2 实验变量设置
Table 2. Setting of variable in the experiments
Sample Ply angles Proportion/% Thickness/mm A [±25°]4 20 2.20 B 40 2.25 C 60 2.29 D 80 2.25 表 3 T700SC 12K碳纤维/BAC-172环氧树脂复合材料的FEA参数
Table 3. FEA parameters of T700SC 12K carbon fiber/BAC-172 epoxy resin composites
Parameter Value Xt, Yt/MPa 1632, 34 E1t, E2t /GPa 123, 7.8 υ12, υ13 0.27 υ23 0.42 Xc, Yc/MPa 704, 68 G12/GPa 3.8 G13, G23/GPa 5.0 τ12/MPa 55 τ13, τ23/MPa 80 Notes: E1t, E2t—Tensile elastic modulus; υ12, υ13, υ23—Poisson’s ratio; G12, G13, G23—Shear modulus; Xt—Longitudinal tensile strength; Xc—Longitudinal compressive strength; Yt—Transverse tensile strength; Yc—Transverse compressive strength; τ12—Longitudinal shear strength; τ12, τ13—Transverse shear strength. -
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