Out-of-plane compressive characteristics of brazing mild steel honeycomb structures
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摘要: 利用MTS810材料试验机对真空钎焊普碳钢蜂窝夹芯板的面外压缩性能进行了实验测试.分析了面外压缩变形特性以及结构参数对蜂窝夹芯板面外压缩强度的影响.研究发现,普碳钢蜂窝夹芯板的面外压缩变形可分为弹性变形、塑性变形和压实三个阶段.蜂窝胞壁厚度与胞壁边长的比值t/a是影响塑性变形初期变形方式的主要因素.比值t/a>0.0427时,塑性变形初期以屈服方式进行;t/a<0.0427时,塑性变形初期以屈曲方式进行.在结构参数对性能的影响中,胞壁厚度对蜂窝夹芯板的初始压缩强度和峰值抗压强度影响最大,胞壁边长的影响次之,而面板及夹芯厚度的影响较小.Abstract: The experimential investigations on out-of-plane compressive characteristics of brazing mild steel honeycomb sandwich structures were conducted by using a MTS 810 material test system. The influences of structural parameters on the compressive properties of honeycomb sandwich structures were analyzed in terms of the measured data. Three deformation stages, i.e., elastic deformation, plastic deformation and densification, are observed on the stress-strain curve. The initial deformation mode depends on the ratio of cell wall thickness to side length (t/a). The yielding mode dominates initial deformation as t/a > 0.042 7, while the buckling mode dominates initial deformation as t/a < 0.042 7. In all structural parameters, the cell wall thickness has a strong influence on the initial compressive strength and peak compressive strength, the cell wall side length in the next place, and both the facing thickness and the height of core have a weak influence.
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Keywords:
- steel honeycomb /
- sandwich /
- composites /
- stress-strain curves /
- compressive strength /
- buckling
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