A standard experimental method for determining the material length scale based on modified couple stress theory

被引：149
|
作者：
Li, Zhenkun [1 ,2 ]
He, Yuming [1 ,2 ]
Lei, Jian [1 ,2 ]
Guo, Song [1 ,2 ]
Liu, Dabiao [1 ,2 ]
Wang, Lin [1 ,2 ]
机构：
[1] Huazhong Univ Sci & Technol, Dept Mech, Wuhan 430074, Hubei, Peoples R China
[2] Hubei Key Lab Engn Struct Anal & Safety Assessmen, Wuhan 430074, Hubei, Peoples R China
来源：
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES | 2018年 / 141卷
基金：
中国国家自然科学基金;
关键词：
Size effect; Material length scale; Modified couple stress theory; Microbeams; Vibration measurement; GRADIENT PLASTICITY; FREE-VIBRATION; MICRO-PLATE; ELASTICITY; TORSION; MODEL; WIRES; SHEAR;
D O I：
10.1016/j.ijmecsci.2018.03.035
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
A standard experimental method for determining the intrinsic material length scale of modified couple stress theory is proposed based on a non-contact laser Doppler vibration measurement system. The first-order resonant frequencies of two different cantilever microbeams made of copper and titanium with thickness ranging from 15 to 2 mu m are measured, respectively. The elastic size effects are obviously observed from the experimental results. The length scale parameters are obtained by fitting the experiment data with the modified couple stress theory. Multiply verified by different kind of materials, we considered this method a standard and valid way for determining the material length scales of modified couple stress theory.
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页码：198 / 205
页数：8
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