Torsion properties of carbon fiber reinforced polymer composite-metal transmission shaft based on delamination damage analysis
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摘要: 为提高油动四旋翼无人机载重能力,对碳纤维增强树脂复合材料(CFRP)-金属传动轴进行研究。CFRP-金属传动轴扭转强度影响因素为CFRP管制孔质量问题和传动过程中销钉对连接孔的挤压作用。研究导致CFRP管孔入出口分层损伤的力学行为,揭示了CFRP管制孔质量的影响机制并优化了制孔工艺。利用扭转试验对销接式CFRP-金属传动轴和附有内外衬套的混合式CFRP-金属传动轴进行对比分析。结果表明:在CFRP管内外附有铝合金衬套可有效减少制孔时的分层损伤,使孔入口质量提高了4.4%,孔出口质量高了8.3%,同时抑制销钉对连接孔的挤压作用。优化后的传动轴承受扭矩从499 N·m提高到952 N·m。Abstract: To improve the load capacity of the oil powered quadrotor unmanned aerial vehicle, carbon fiber reinforced polymer composite (CFRP)-metal transmission shafts are studied. The factors affecting the torsional strength of CFRP-metal transmission shafts are the quality of CFRP pipe holes and the extrusion effect of pins on connecting holes during transmission. By studing the mechanical behaviors causing delamination damage at the entrance and exit of CFRP tube, the influence mechanism of the quality of CFRP pipe holes was revealed and the hole making process was optimized. A comparative analysis between pin-connection CFRP-metal transmissions shafts and hybrid CFRP-metal transmission shafts with inner and outer bushing was carried out by torsion tests. The results show that the addition of the inside and outside aluminum alloy bushing of CFRP tubes can effectively reduce the delamination damage during drilling. The quality of the entrance and exit of holes can be increased by 4.4% and 8.3%, respectively. Meanwhile, the extrusion effect of the pins on the connecting holes is restrained. The torque values of the optimized transmission bearing is increased from 499 N·m to 952 N·m.
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表 1 T700 CFRP的材料参数
Table 1. Parameters of T700 CFRP
E1/MPa E2=E3/MPa ν12=ν13 ν23 G12=G13=G23/MPa XT/MPa XC/MPa YT/MPa YC/MPa S12=S13/MPa S23/MPa ρ/(kg·m−3) 115000 6430 0.34 0.28 6000 1500 700 30 100 60 30 1790 Notes: ${E_i}$—Tensile moduli in different directions; ${G_{ij}}$—Shear moduli in plane in directions of $i$ and $j$;ν${}_{ij} $—Poisson’s ratios in plane in directions of $i$ and $j$; $i$, $j$—1, 2 or 3; ρ—Density. -
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