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Numerical investigation of indentation fatigue on polycrystalline copper

Published online by Cambridge University Press:  31 January 2011

B.X. Xu*
Affiliation:
School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi’an 710072, Peoples Republic of China; and Columbia Nanomechanics Research Center, Department of Civil Engineering and Engineering Mechanics, Columbia University, New York, New York 10027-6699
Z.F. Yue
Affiliation:
School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi’an 710072, Peoples Republic of China
X. Chen
Affiliation:
Columbia Nanomechanics Research Center, Department of Civil Engineering and Engineering Mechanics, Columbia University, New York, New York 10027-6699
*
a) Address all correspondence to this author. e-mail: bx2107@columbia.edu
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Abstract

The dynamic indentation response of polycrystalline copper under cyclic fatigue loading is studied with a flat cylindrical indenter. First, a simple analytical model shows that in a purely elastic solid, the indentation depth responds with the same wavelength and frequency as the applied sinusoidal fatigue load. Next, a numerical simulation of an indentation fatigue test on an elastic-plastic solid (polycrystalline copper) is performed. Finite element analyses reveal that the mean indentation depth is controlled by both the mean of the indentation fatigue load and the load amplitude, while the amplitude of the indentation depth is independent of the mean load. Further investigations indicate that with an increased number of cycles, the increment of indentation depth reaches a constant rate. The steady state indentation depth rate is dependent not only on the amplitude of indentation fatigue load but also on the fatigue mean load, which is similar to strain accumulation during a conventional fatigue test. A parallel indentation experiment on annealed polycrystalline copper also confirms the effect of the fatigue mean load, indicating consistency with numerical results.

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Copyright © Materials Research Society 2009

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