期刊
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
卷 26, 期 10, 页码 4923-4932出版社
SPRINGER
DOI: 10.1007/s11665-017-2904-3
关键词
7050-T7452 aluminum alloy; Berkovich indenter; instrumented indentation method; local residual stress; microzone
资金
- National Natural Science Foundation of China [51401177]
- Natural Science Foundation of Jiangsu Province [BK20130222]
- Qing Lan Project of Jiangsu Province [2014-23]
- Science and Technology Project of Xuzhou City [KC16SG279]
- Natural Science Foundation of Jiangsu Higher Education Institution of China [17KJA460010]
The local residual stresses in microzones are investigated by the instrumented indentation method with the Berkovich indenter. The parameters required for determination of residual stresses are obtained from indentation load-penetration depth curves constructed during instrumented indentation tests on flat square 7050-T7452 aluminum alloy specimens with a central hole containing the compressive residual stresses generated by the cold extrusion process. The force balance system with account of the tensile and compressive residual stresses is used to explain the phenomenon of different contact areas produced by the same indentation load. The effect of strain-hardening exponent on the residual stress is tuned-off by application of the representative stress in the average contact pressure assessment using the theorem, while the yield stress value is obtained from the constitutive function. Finally, the residual stresses are calculated according to the proposed equations of the force balance system, and their feasibility is corroborated by the XRD measurements.
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