Investigation of residual stress by the indentation method with the flat cylindrical indenter |
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Authors: | B X Xu B Zhao Z F Yue |
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Affiliation: | (1) Department of Engineering Mechanics, Northwestern Polytechnical University, 710072 Xi’an, People’s Republic of China |
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Abstract: | Experiments and numerical simulations have been carried out to study residual stress of copper specimens by the identation
method with a flat cylindrical indenter. Copper specimens were annealed at different temperatures for 35 min to obtain different
residual stress levels. The experiments carried out on these specimens demonstrated the influence of residual stress on indentation
behavior. The influence of annealing temperature on the elastic-plastic transition region is quite obvious. A method has been
presented to determine material properties, such as elastic modulus and Poisson ratio. This method can also be applied to
determine residual stress with the assumption of knowing the yield stress in advance. The advantage of this method is that
it can avoid calculating the contact area. In the finite element modeling (FEM), residual stresses on copper specimens are
simulated by preapplying stresses. The influence of residual stress on the indentation load-depth curves has been studied
by FEM. There is good agreement between experimental and FEM numerical results. A numerical method has also been presented
to determine residual stress. In addition, Mises stress and plastic distribution ahead of the indenter have also been studied
to help us further understand the influence of residual stress. |
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Keywords: | anneal elastic-plasticity finite element analysis indentation experiment residual stress |
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