Lijian Pan
材料科学技术（英文）
The composite laminates with embedded acrylonitrile butadiene rubber (NBR) layer were fabricated by cocuring process. The embedded layers were perforated with a series of small holes to allow resin to flow through the damping layer and completely couple the structure to improve bending stiffness and interlaminar shearing strength of these cocured composite laminates. The damping, bending stiffness and shearing strength of these composite laminates with different perforation diameters were investigated. The experimental results show that increasing the perforation diameter leads to significant decreases in damping and significant increase in bending stiffness up to an area ratio of 7.065%. The area ratio here is defined as the ratio of perforation area to the total damping area. Beyond the area ratio of 7.065%, increasing the diameter to an area ratio of 50.24% results in only a slight variation in damping and bending stiffness. Moreover, increasing the perforation diameter does not always increase the shearing strength of the embedded viscoelastic layer. The shearing strength of embedded viscoelastic layer increases only when the area ratio is greater than 19.625%; instead, it will decrease.
关键词:
Composite laminates
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Lijian Pan
材料科学技术（英文）
Presented herein is a methodology for the multi-objective optimization of damping and bending stiffness of co-coured composite laminates with embedded viscoelastic damping layer. The embedded viscoelastic damping layer is perforated with a series of small holes, and the ratio of the perforation area to the total damping area is the design variable of the methodology. The multi-objective optimization is converted into a single-objective problem by an evaluation function which is a liner weigh sum of the two sub-objective functions. The proposed methodology was carried out to determine the optimal perforation area ratios of two viscoelstic layers with different perforation distance embedded in two composite plates. Both the optimal perforation area ratios are approximate to 2.2%. However, the objective value of the plate with greater perforation distance in embedded viscoelatic layer is much greater.
关键词:
Composite laminates
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李峰
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陈金龙
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宫文然
宇航材料工艺
doi:10.3969/j.issn.1007-2330.2016.05.005
分层损伤是复合材料层合板结构最主要的损伤形式,其主要由于制造缺陷以及受到外力冲击而产生.本文对含圆形分层损伤复合材料层合板在弯曲载荷作用下的屈曲行为进行研究,首先利用Rayleigh-Ritz法对含圆形分层复合材料层合板进行二维模型建立,通过此理论模型可以计算出材料屈曲临界弯矩值以及在特定弯曲载荷下中心点的离面位移值.随后,采用三维数字图像相关方法对分层材料进行实验研究,得到了分层材料在弯曲载荷作用下的屈曲形貌以及其中心点的载荷—位移曲线.通过实验验证了理论的可行性与准确性,可用于对含圆形分层材料在弯曲载荷作用下屈曲临界弯矩以及中心点离面位移大小的初步估算.
关键词:
瑞利-里兹法
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圆形分层损伤
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屈曲
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纤维增强复合材料
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三维数字图像相关方法
