3-D analytical model for bending stiffness of thick-walled composite hollow shaft

Mo Yang,Xian Zhou,Yikun Wang,Jianmin Ye,Tao Qin,Wen Zhang,Yuebin Zhou

doi:10.1177/16878140211004779

Mo Yang, Xian Zhou + Show 5 more

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https://doi.org/10.1177/16878140211004779

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Abstract

In this paper, the Layer-wise theory was improve based on the alternate characteristics of layer angle of composite hollow shaft. The ±φi laminate was considered as the minimum mechanical analysis element, which can effectively simplify the stress coupling in mechanical analytical method. On this foundation, a 3-D analytical method of bending stiffness < EI> for thick-walled composite hollow shaft was derived. The CFRP hollow shaft specimens made of same dimensions but different laminate were used for bending test. Then, the bending stiffness calculated by theory of beams, 2-D analytical method, 3-D analytical model and experiment were compared. All the results show that the 3-D analytical model predicts the bending stiffness of thick-walled composite hollow shaft more precisely than the theory of beams and analytical method, and agree well with experimental results. And the 3-D analytical model can reflect the influence of stacking sequence on the bending stiffness of the composite hollow shaft.

Highlights

As Carbon Fiber Reinforced Plastic (CFRP) has the advantages of high specific strength, high specific modulus, large damping ratio and fatigue resistance, hollow shaft made of CFRP is especially suitable for transmission systems with long span, large torque, and high rotation speed.[1,2]It is well-known that the critical bending speed of the CFRP transmission shaft is related to the bending stiffness of the CFRP hollow shaft.[3,4] Badie et al.[5] studied the natural frequency of a drive shaft with 6.35 mm radius and 1.48 mm wall thickness
The drive shaft was idealized as a thin shell tube and supported beam, and found that critical bending speed of the CFRP transmission shaft can be increased by increasing the axial modulus
Many studies have researched the bending stiffness of layered thick-walled composite tube used as structure beams

Summary

Introduction

As Carbon Fiber Reinforced Plastic (CFRP) has the advantages of high specific strength, high specific modulus, large damping ratio and fatigue resistance, hollow shaft made of CFRP is especially suitable for transmission systems with long span, large torque, and high rotation speed.[1,2]It is well-known that the critical bending speed of the CFRP transmission shaft is related to the bending stiffness of the CFRP hollow shaft.[3,4] Badie et al.[5] studied the natural frequency of a drive shaft with 6.35 mm radius and 1.48 mm wall thickness. Keywords 3-D analysis, thick-walled, composite hollow shaft, bending stiffness, modified layer-wise theory Important parameter (bending stiffness) of the transmission shaft was predicted by classical thin lamination theory or calculated by FEA using the thin shell element, and regardless of whether the composite hollow shaft satisfied thin wall condition (radius/ wall thickness ø 10).

Results

Conclusion