Surface Fractal Analysis for Estimating the Fracture Energy Absorption of Nanoparticle Reinforced Composites.
Surface Fractal Analysis for Estimating the Fracture Energy Absorption of Nanoparticle Reinforced Composites.
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DOI：
10.3390/ma5050922
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发表时间：
2012-05-23
期刊：
影响因子：
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通讯作者：
Mantena PR
中科院分区：
文献类型：
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作者：
Pramanik B;Tadepalli T;Mantena PR
在这项研究中，乙烯基酯基纳米复合材料的破坏表面的分形维数估计使用两种经典的方法，垂直截面法（VSM）和狭缝岛法（SIM），基于三维数字显微图像的处理。自仿射分形几何已被观察到在实验获得的石墨片增强纳米复合材料的准静态单轴拉伸和低速冲剪载荷的破坏表面。断裂能和断裂韧性的估计解析从表面分形维数。敏感性研究表明，断裂能和断裂韧性的分形维数的指数依赖。这些纳米颗粒增强复合材料的总能量吸收的断裂能的贡献被证明。对于石墨片增强纳米复合材料的研究，表面分形分析描绘了可能的韧性或脆性断裂传播机制，这取决于加载速率。
In this study, the fractal dimensions of failure surfaces of vinyl ester based nanocomposites are estimated using two classical methods, Vertical Section Method (VSM) and Slit Island Method (SIM), based on the processing of 3D digital microscopic images. Self-affine fractal geometry has been observed in the experimentally obtained failure surfaces of graphite platelet reinforced nanocomposites subjected to quasi-static uniaxial tensile and low velocity punch-shear loading. Fracture energy and fracture toughness are estimated analytically from the surface fractal dimensionality. Sensitivity studies show an exponential dependency of fracture energy and fracture toughness on the fractal dimensionality. Contribution of fracture energy to the total energy absorption of these nanoparticle reinforced composites is demonstrated. For the graphite platelet reinforced nanocomposites investigated, surface fractal analysis has depicted the probable ductile or brittle fracture propagation mechanism, depending upon the rate of loading.