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
[1] Sihn S, Kim R Y, Kawabe K, et al. Experimental studies of thin-ply laminated composites. Compos Sci Technol, 2007, 67(6):996 [2] Fuller J D, Wisnom M R. Pseudo-ductility and damage suppression in thin ply CFRP angle-ply laminates. Composites Part A, 2015, 69:64 [3] Borg C. An introduction to spread tow reinforcements:Part 1-manufacture and properties. Reinf Plast, 2015, 59(4):194 [4] EL-Dessouky H M, Lawrence C A. Ultra-lightweight carbon fibre/thermoplastic composite material using spread tow technology. Composites Part B, 2013, 50:91 [6] Yuan Y N, Wang S, Yang H, et al. Analysis of pseudo-ductility in thin-ply carbon fiber angle-ply laminates. Compos Struct, 2017, 180:876 [7] Yamashita S, Sonehara T, Takahashi J, et al. Effect of thin-ply on damage behaviour of continuous and discontinuous carbon fibre reinforced thermoplastics subjected to simulated lightning strike. Composites Part A, 2017, 95:132 [8] Yuan Y N, Yao X F, Liu B, et al. Failure modes and strength prediction of thin ply CFRP angle-ply laminates. Compos Struct, 2017, 176:729 [9] Saito H, Takeuchi H, Kimpara I. A study of crack suppression mechanism of thin-ply carbon-fiber-reinforced polymer laminate with mesoscopic numerical simulation. J Compos Mater, 2014, 48(17):2085 [10] Amacher R, Cugnoni J, Botsis J, et al. Thin ply composites:experimental characterization and modeling of size-effects. Compos Sci Technol, 2014, 101:121 [11] Reinoso J, Arteiro A, Paggi M, et al. Strength prediction of notched thin ply laminates using finite fracture mechanics and the phase field approach. Compos Sci Technol, 2017, 150:205 [12] Sebaey T A, Mahdi E. Using thin-plies to improve the damage resistance and tolerance of aeronautical CFRP composites. Composites Part A, 2016, 86:31 [13] Cheng S, Ho B P C. Stability of heterogeneous anisotropic cylindrical shells under combined loading. AIAA J, 1963, 1(4):892 [14] Jones R M. Buckling of circular cylindrical shells with multiple orthotropic layers and eccentric stiffeners. AIAA J, 1968, 6(12):2301 [15] Bisagni C, Cordisco P. An experimental investigation into the buckling and post-buckling of CFRP shells under combined axial and torsion loading. Compos Struct, 2003, 60(4):391 [18] Weaver P M, Driesen J R, Roberts P. Anisotropic effects in the compression buckling of laminated composite cylindrical shells. Compos Sci Technol, 2002, 62(1):91 [19] Soutis C. Compressive strength of composite laminates with an open hole:effect of ply blocking. J Compos Mater, 2013, 47(20-21):2503 [20] Chamis C C. Buckling of anisotropic composites plates. J Struct Divis, 1969, 95(10):2119 -
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