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Two Parameters Describing Cyclic Hardening/Softening Behaviors of Metallic Materials

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Abstract

In this article, cyclic hardening/softening behaviors of metallic materials are studied by using 40 alloys’ test results. In the analysis, two parameters are introduced: one parameter is new fracture ductility parameter; the other is cyclic hardening/softening factor. The new fracture ductility parameter expresses cyclic hardening/softening. According to the criterion, there are three critical values—2, 20, and 65.4%. When the new fracture ductility parameter is smaller than 2%, or ranges from 20% to 65.4%, the alloy behaves in a cyclic softening manner. However, when the new fracture ductility parameter ranges from 2% to 20%, or is greater than 65.4%, the alloy behaves in a cyclic hardening manner. The cyclic hardening/softening factor describes the degree of cyclic hardening/softening. If the cyclic hardening/softening factor is greater than 1, the material behaves in a cyclic hardening manner. But if the cyclic hardening/softening factor is smaller than 1, the material behaves in a cyclic softening manner. The more the cyclic hardening/softening factor deviates from 1, the greater the degree of hardening/softening. Compared with the traditional criteria, on the one hand, the present criterion has no indeterminate range, while on the other hand, the cyclic hardening/softening factor quantitatively describes the degree of cyclic hardening/softening. Therefore,the two parameters provide a more descriptive way to describe cyclic hardening/softening behaviors for metallic materials.

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Acknowledgments

The authors gratefully acknowledge the financial support of both Shaanxi province Nature Science Foundation and Air Force Engineering University Academic Foundation.

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  1. The Science Institute, Air Force Engineering University, Xi’an, 710051, China

    Zhongping Zhang, Jing Li, Qiang Sun, Yanjiang Qiao & Chunwang Li

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  1. Zhongping Zhang
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Correspondence to Zhongping Zhang.

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Zhang, Z., Li, J., Sun, Q. et al. Two Parameters Describing Cyclic Hardening/Softening Behaviors of Metallic Materials. J. of Materi Eng and Perform 18, 237–244 (2009). https://doi.org/10.1007/s11665-008-9287-4

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  • DOI: https://doi.org/10.1007/s11665-008-9287-4

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