薄铺层复合材料薄壁管轴压屈曲行为研究  

Buckling of composite cylindrical shells fabricated using thin-ply under axial compression

作　　者：黄春芳[1] 肖加余[1] 黄展鸿 张鉴炜[1] 鞠苏[1] 江大志[1] HUANG Chun-fang;XIAO Jia-yu;HUANG Zhan-hong;ZHANG Jian-wei;JU Su;JIANG Da-zhi(Department of Materials Science and Engineering,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学材料科学与工程系

出　　处：《工程科学学报》2018年第7期857-863,共7页Chinese Journal of Engineering

基　　金：国家自然科学基金资助项目(11202231,U1537101,51403235)

摘　　要：在薄壁结构的应用中,屈曲稳定性是影响其承载性能的关键因素,为研究减薄铺层厚度对复合材料薄壁结构局部屈曲行为的影响,本文采用不同厚度（0.125、0.055和0.020 mm）的预浸料制备复合材料薄壁管,实验测试了其在轴压下的局部屈曲行为.实验结果表明,随着铺层厚度减薄,实验采用的正交和均衡两种铺层方式的复合材料薄壁管局部屈曲载荷均随之提高,而屈曲失效模式没有发生改变.力学分析表明,铺层厚度减薄后,管壁弯曲刚度的改变和层间剪切应力分布对薄壁管局部屈曲载荷提高有重要影响.采用薄铺层制备复合材料薄壁结构件能够有效提高其局部屈曲能力.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.

关 键 词：复合材料 薄铺层 薄壁管 压缩 屈曲载荷 

分 类 号：TB332[一般工业技术—材料科学与工程]