考虑压头曲率半径和应变梯度的微压痕分析
THE INFLUENCE OF INDENTER TIP RADIUS TO MICRO-INDENTATION TESTS
查看参考文献13篇
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文摘
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在压头尖端曲率半径取100nm的前提下,采用Chen和Wang的应变梯度理论,对微压痕实验进行了系统的数值分析.首先通过拟合载荷-位移实验曲线的后半段来确定材料的屈服应力和幂硬化指数值,然后用有限元方法数值模拟压痕实验,并将计算得到的整段载荷-位移曲线及硬度-位移曲线和实验结果进行了比较.结果表明应变梯度理论所预测的计算结果和实验结果很好地符合,包括压痕深度在亚微米和微米范围内的整段曲线. |
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其他语种文摘
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In this paper, the effect of the indenter tip radius of curvature on the micro indentation hardness was investigated, using finite element method with the strain gradient theory. It is known that, when the indentation depth is large enough, the conventional J2 theoretical results agree well with the experiment results and the indentation hardness values are independent of the indentation depth. It means that there is a nearly flat section on the experimental curve of the depth versus the indentation hardness, in which the indentation hardness is nearly constant, and the influence of strain gradient effect on the indentation hardness is quite small, hence we can use the later section of the experimental curve of indenting depth versus load which corresponds to the nearly flat section of the experimental curve of indenting depth versus the indentation hardness to get three material constants (yielding stress, the exponent of the power law strain hardening and intrinsic parameter) using fitting method.
Following the above thinking, we simulated the three existed indentation tests based on the strain gradient theory proposed by Chen and Wang. The simulation results confirmly show that the size effect of the micro indentation hardness for the indentation test is really existed due to the factor of the strain gradient effect. |
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来源
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力学学报
,2004,36(6):680-687 【核心库】
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关键词
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压痕尺度效应
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压头尖端曲率半径
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应变梯度理论
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有限元模拟
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微压痕实验
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地址
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中国科学院力学研究所, 非线性力学国家重点实验室, 北京, 100080
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语种
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中文 |
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ISSN
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0459-1879 |
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学科
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力学 |
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基金
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国家自然科学基金
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文献收藏号
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CSCD:1793888
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参考文献 共
13
共1页
|
|
1.
Iost A. reality or artefact.
Journal of Material Science,1996,31:3573-3577
|
CSCD被引
5
次
|
|
|
|
|
2.
Shi M X. Fracture in a higherorder elastic continuum.
J Mech Phys Solids,2000,48:2513-2538
|
CSCD被引
3
次
|
|
|
|
|
3.
Truly D M. The nature of mechanically polished surfaces of copper.
Metallography,1981,14:275-294
|
CSCD被引
2
次
|
|
|
|
|
4.
李敏. 纳米压痕过程的三维有限元数值试验研究.
力学学报,2003,35(3):257-264
|
CSCD被引
16
次
|
|
|
|
|
5.
Swadener J G. The correlation of the indentation size effect measured with indenter of various shapes.
J Mech Phys Solids,2002,50:681-694
|
CSCD被引
5
次
|
|
|
|
|
6.
Volinsky A A. Nanoindentation methods in interfacial fracture testion.
Comprehensive Structural Integrity Fracture of Material from Nano to Macro,2003:453-494
|
CSCD被引
1
次
|
|
|
|
|
7.
Chen S H. A new deformation theory for strain gradient effects.
Int J Plasticity,2002,18(8):971-995
|
CSCD被引
10
次
|
|
|
|
|
8.
Bhattachary A K. Finite element simulation of indentation experiments.
Int J of Solids and Structure,1988,24(9):881-891
|
CSCD被引
3
次
|
|
|
|
|
9.
Laursen T A. A study of the mechanics of microindentation using finite elements.
J Mater Res,1992,7(3):618-626
|
CSCD被引
4
次
|
|
|
|
|
10.
Bolshakov A. Finite element simulations.
J Mater Res,1996,11(3):760-768
|
CSCD被引
6
次
|
|
|
|
|
11.
Oliver W C. An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments.
J Mater Res,1992,7(6):1546-1583
|
CSCD被引
6
次
|
|
|
|
|
12.
Ma Q. Size dependent hardness in silver single crystals.
J Mater Res,1995,10:853
|
CSCD被引
15
次
|
|
|
|
|
13.
McElhaney K W. Determination of indenter tip geometry and indentation contact area for depthsensing indentation experiments.
J Mater Res,1998,13:1300
|
CSCD被引
9
次
|
|
|
|
|
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