Residual strains of aluminum alloy characterized by nanoindentation
(1. Department of Physics, Harbin Institute of Technology, Harbin 150001, China;
2. School of Naval Architecture, Harbin Institute of Technology at Weihai, Weihai 264209, China;
3. Department of Optoelectronic Science, Harbin Institute of Technology at Weihai, Weihai 264209, China;
4. Center for Precision Engineering, Harbin Institute of Technology, Harbin 150001, China)
2. School of Naval Architecture, Harbin Institute of Technology at Weihai, Weihai 264209, China;
3. Department of Optoelectronic Science, Harbin Institute of Technology at Weihai, Weihai 264209, China;
4. Center for Precision Engineering, Harbin Institute of Technology, Harbin 150001, China)
Abstract: A formula was brought forward to correlate residual strain with hardness measured by nanoindentation method. Using the formula, residual strains in prestrained aluminum alloy samples were evaluated. In order to compare with the calculated strain, such values were also measured by strain gauge method. The results show that the differences of the residual strain obtained by nanoindentation and strain gauge method are not more than 8%, which shows that the formula is suitable for characterizing residual strain of aluminum alloy.
Key words: aluminum alloy; residual strain; nanoindentation; hardness; strain gauge