• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2021, Vol. 57 ›› Issue (20): 79-88.doi: 10.3901/JME.2021.20.079

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Composite Dual-conical Indentation Method for Predicting the Uniaxial Mechanical Properties of Aluminum Alloys

CHEN Hui1,2, CAI Lixun3, PENG Hui1,2   

  1. 1. School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114;
    2. Key Laboratory of Bridge Engineering Safety Control by Department of Education, Changsha University of Science & Technology, Changsha 410114;
    3. School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu 610031
  • Received:2020-04-29 Revised:2021-07-06 Online:2021-10-20 Published:2021-12-15

Abstract: Conical indentation, as an early developed indentation test method, can uniquely acquire the uniaxial mechanical properties of materials within a certain range, but there are still defects in stability and simplicity. In order to avoid the problems that the traditional dual-conical indentation requires two indenters to penetrate different positions respectively and the compatibility between the indentation points, a composite dual-conical indenter is innovatively designed and used. Based on equivalent energy principle, an elastic-plastic loading model for conical indentation is established and its accuracy is verified via a large range of numerical simulations. By correlating response curves of composite dual-conical indentation and single-conical indentation, a composite dual-conical indentation method(CDIM) is developed. For three kinds of aluminum alloys, the stable load-depth curves are obtained by the composite indentation tests, and the uniaxial stress-strain curves are predicted by CDIM. The results show that the predictions of CDIM are consistent with those from uniaxial tension.

Key words: composite dual-conical indentation, equivalent energy principle, finite element analysis, mechanical properties

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