Measuring the constitutive behavior of viscoelastic solids in the time and frequency domain using flat punch nanoindentation
Measuring the constitutive behavior of viscoelastic solids in the time and frequency domain using flat punch nanoindentation
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DOI：
10.1557/jmr.2009.0089
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发表时间：
2009-03-01
影响因子：
2.7
通讯作者：
Pharr, G. M.
中科院分区：
文献类型：
--
作者：
Herbert, E. G.;Oliver, W. C.;Pharr, G. M.
这项工作的目的是进一步开发使用平冲纳米压痕测量粘弹性固体在频域和时域的本构行为的实验方法。本研究中使用的参考材料是高度增塑的聚氯乙烯 (PVC)，玻璃化转变温度为 - 17 摄氏度。纳米压痕实验使用直径 983 微米的平冲头进行。为了进行比较，还提供了通过使用直径为 103 微米的平冲头进行纳米压痕和动态力学分析获得的储能模量和损耗模量。在 0.01-50 Hz 的频率范围内，使用纳米压痕和单轴压缩测量的储能模量和损耗模量表现出极好的一致性。使用单轴压缩和平冲纳米压痕中进行的恒定应力测试测量的蠕变柔度函数也显示出在近 4 个十年的时间内具有良好的相关性。此外，根据在频域中获取的纳米压痕数据预测的蠕变柔量函数与在时域中测量的蠕变柔量函数密切相关。在 5、10、15 和 22 摄氏度下获取的纳米压痕数据的时间-温度叠加表明该样品在热流变学上并不简单。因此该技术不能用于扩展这种材料的机械特性。总的来说，这些结果清楚地证明了平冲纳米压痕能够准确、精确地确定粘弹性固体在时域和频域中的本构行为。
The purpose of this work is to further develop experimental methodologies using flat punch nanoindentation to measure the constitutive behavior of viscoelastic solids in the frequency and time domain. The reference material used in this investigation is highly plasticized polyvinylchloride (PVC) with a glass transition temperature of - 17 degrees C. The nanoindentation experiments were conducted using a 983-mu m-diameter flat punch. For comparative purposes, the storage and loss modulus obtained by nanoindentation with a 103-mu m-diameter flat Punch and dynamic mechanical analysis are also presented. Over the frequency range of 0.01-50 Hz, the storage and loss modulus measured using nanoindentation and uniaxial compression is shown to be in excellent agreement. The creep compliance function measured using a constant stress test performed in uniaxial compression and flat punch nanoindentation is also shown to correlate well over nearly 4 decades in time. In addition, the creep compliance function predicted from nanoindentation data acquired in the frequency domain is shown to correlate strongly with the creep compliance function measured in the time domain. Time-temperature superposition of nanoindentation data taken at 5, 10, 15, and 22 degrees C shows the sample is not thermorheologically simple. and thus the technique cannot be used to expand the mechanical characterization of this material. Collectively, these results clearly demonstrate the ability of flat punch nanoindentation to accurately and precisely determine the constitutive behavior of viscoelastic solids in the time and frequency domain.