Compound structure and mechanical properties ofthe natural polymeric cellular materials
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摘要: 通过扫描电子显微镜和光学显微镜研究了2 种天然高分子泡沫材料, 即玉米秆芯和高粱秆芯切面的泡孔形态结构及胞体堆砌模式。测试了材料在轴向和径向的压缩杨氏模量和压缩屈服强度等力学性能, 探讨了泡沫材料的压缩变形机制, 建立了天然泡沫材料的复合结构模型, 并分析了力学性能与复合结构的关系。研究结果表明, 这2 种天然泡沫均由一种近似六棱柱和少量圆形管状胞体构成, 它们在轴向的杨氏模量和屈服强度分别比径向的大4 倍以上。导管增强的复合结构是引起天然泡沫材料具有明显各向异性的重要原因, 其中厚壁导管的轴向杨氏模量约为不规则六棱柱胞体的105 倍。Abstract: The compressive yield st ress and modulus of the two natural foam cores of kaoliang stem and corn stemwere tested. Their st ructures and morphologies were determined by scanning elect ron microscope. The differentcompressive deformation mechanics of the foams were discussed. A compound st ructure model made up of hexangular prisms and tubular cells was established f rom the observation on scanning elect ron microscope photographs. Theeffect s of the compound st ructure of the foams on their mechanical properties were studied on the basis of the model.The result s show that the compressive yield st ress and modulus of the two natural foam cores in the axial directionare more than 4 times of those in the radial direction. The compound st ructure of the foams reinforced by the tubularcells has more significant effect s on the corresponding mechanical properties of the foams. The axial compressivemodulus of a tubular cell is 105 times that of an abnormal hexangular prism cell.
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Key words:
- natural polymer /
- foam materials /
- compound structure /
- mechanical properties
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