Buckling of composite cylindrical shells fabricated using thin-ply under axial compression
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摘要: 在薄壁結構的應用中,屈曲穩定性是影響其承載性能的關鍵因素,為研究減薄鋪層厚度對復合材料薄壁結構局部屈曲行為的影響,本文采用不同厚度(0.125、0.055和0.020 mm)的預浸料制備復合材料薄壁管,實驗測試了其在軸壓下的局部屈曲行為.實驗結果表明,隨著鋪層厚度減薄,實驗采用的正交和均衡兩種鋪層方式的復合材料薄壁管局部屈曲載荷均隨之提高,而屈曲失效模式沒有發生改變.力學分析表明,鋪層厚度減薄后,管壁彎曲剛度的改變和層間剪切應力分布對薄壁管局部屈曲載荷提高有重要影響.采用薄鋪層制備復合材料薄壁結構件能夠有效提高其局部屈曲能力.Abstract: Carbon-fiber reinforced polymer (CFRP) composites possess high specific stiffness and strength and have been widely used as structural materials in aerospace and aircraft engineering. In many practical applications, such as wing skin, loading condition is a complexity of tension, bending, and torsion. Therefore, fabricating CFRP composite laminates of multiple-angled plies is necessary to achieve balanced mechanical properties and meet the loading requirements under different working conditions. However, considering the size and weight limitations, designing a quasi-isotropic laminate with standard ply thickness (0.125 mm) is difficult. The recently developed spread-tow technique has provided a promising strategy to fabricate composite laminates of thin and light plies for the production of thinner and lighter laminates and structures and improvement of mechanical performance. Laminates fabricated using thin plies exhibit much higher strength in tension, compression, and impact as compared with standard-ply laminates because of the associated positive size effects. In the thin-walled structure, buckling stability is the primary factor determining the mechanical performance. In this study, composite cylindrical shells with different ply thickness (0.125, 0.055, and 0.020 mm) were fabricated via cross-ply and balanced stacking using the spread-tow technique, and their buckling behaviors under axial compression were studied. The experimental results show that with decreasing ply thickness, the critical buckling loads of composite cylindrical shells with cross-ply and balanced stacking under axial compression increase, whereas the buckling mode of composite cylindrical shells remains constant. Mechanical analysis indicates that the bending stiffness variation and interlaminar shear stress distribution play a key role in increasing the critical buckling load of the composite cylindrical shells, and the application of thin plies effectively improves the local buckling performance of the thin-walled composite structures.
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Key words:
- composites /
- thin-ply /
- thin-walled cylindrical shell /
- compression /
- critical buckling load
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參考文獻
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