Nanoindentation testing for evaluating modulus and hardness of single-walled carbon nanotube–reinforced epoxy composites
Nanoindentation testing for evaluating modulus and hardness of single-walled carbon nanotube–reinforced epoxy composites
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DOI：
10.1557/jmr.2004.19.1.158
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发表时间：
2004-01
影响因子：
2.7
通讯作者：
A. Dutta;D. Penumadu;B. Files
中科院分区：
文献类型：
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作者：
A. Dutta;D. Penumadu;B. Files
仪器压痕测试被用来评估的单壁碳纳米管复合材料试样的机械性能的变化与不同的重量百分比（0，0.1，0.5，和1.0重量%）的纳米管使用低粘度液体环氧树脂。采用激光烧蚀技术制备了纳米管。参考拉伸试验也进行了相同的样品，并与压痕结果进行了相关的比较。使用纳米压痕（考虑时间效应）得到的模量和硬度的变化显示出各种复合材料试样之间的可量化的差异，但不同的拉伸试验数据。观察到的刚度和断裂强度的碳纳米管复合材料的小的变化是由于束的形成，其弯曲的形态，和在试样中的微孔。有趣的波动得到的解释值的模量与压痕深度是由于不同程度的局部约束效应的纳米管束。这些纳米复合材料的蠕变指数也进行了评估，并表明相当大的改善。
Instrumented indentation testing was used to evaluate the changes in mechanical properties of single-walled carbon nanotube composite specimens with varying weight percentage (0, 0.1, 0.5, and 1.0 wt%) of nanotubes using a low-viscosity liquid epoxy resin. The nanotubes were prepared using laser ablation technique. Reference tensile tests were also performed on the same samples, and relevant comparisons with indentation results were made. The variations in modulus and hardness obtained using nanoindentation (considering time effects) showed quantifiable differences between the various composite specimens, but differed from tensile test data. The small changes in the observed stiffness and breaking strength of carbon nanotube composites was due to the formation of bundles, their curvy morphology, and microporosity in the specimens. Interesting fluctuations obtained from the interpreted values of modulus with depth of indentation is attributed to varying degrees of the local confining effect of nanotube bundles. Creep exponents for these nanocomposites were also evaluated and indicate considerable improvements.