Identification of viscoelastic model parameters by means of cyclic nanoindentation testing
Identification of viscoelastic model parameters by means of cyclic nanoindentation testing
复制标题
通过循环纳米压痕测试识别粘弹性模型参数
DOI：
10.3139/146.101706
复制
发表时间：
2008
影响因子：
0.8
通讯作者：
R. Lackner
中科院分区：
文献类型：
--
作者：
A. Jäger;R. Lackner
摘要提出了一种利用循环纳米压痕法识别材料时变行为模型参数的方法。材料样品的复剪切模量由载荷历史中的规定振幅、穿透历史中的测量振幅以及载荷峰值和穿透峰值之间的相移确定。通过将实验获得的储能模量和损耗模量（两者都取决于循环测试期间使用的频率）与相应粘弹性模型的解析表达式进行比较，获得特定粘弹性模型的参数。所提出的方法被应用到低密度聚乙烯，提供访问的分数阻尼器的参数，这是用来描述的粘弹性行为。的结果进行了比较，从纳米压痕（静态）蠕变试验的结果，考虑不同的最大载荷。最后，所提出的方法的性能进行评估，通过比较的蠕变柔度函数对应的模型参数确定的纳米压痕与宏观蠕变柔度函数从弯曲梁流变仪测试。
Abstract A method for the identification of model parameters describing the time-dependent material behavior by means of cyclic nanoindentation is presented. The complex shear modulus of the material sample is determined from the prescribed amplitude in the load history, the measured amplitude in the penetration history, and the phase shift between the peak values for the load and the penetration. The parameters for a specific viscoelastic model are obtained by comparing the experimentally-obtained storage and loss moduli – both depending on the frequency used during cyclic testing – with the analytical expressions for the respective viscoelastic model. The presented method is applied to low-density polyethylene, giving access to the parameters of the fractional dash-pot which is used to describe the viscoelastic behavior. The results are compared with results from nanoindentation (static) creep tests, considering different maximum loads. Finally, the performance of the presented method is assessed by comparing the creep-compliance functions corresponding to the model parameters identified by nanoindentation with the macroscopic creep-compliance function obtained from bending-beam-rheometer tests.