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|저자명||Hoon Huh, Kwanghyun Ahn, Ji Ho Lim, Hyung Won Kim, Lee Ju Park|
|Journal||Jornal of Materials Processing Technology|
This paper is concerned with dynamic hardening models of metallic materials for various crystallinestructures. The dynamic response of metallic materials is indispensable for the analysis of deformationin the high-speed condition. The description of the dynamic behavior, however, can be hardly suggestedwith a unique model that is capable of representing the dynamic hardening characteristics of all typesof materials because the dynamic hardening behavior of a material is inherent characteristics which aredifferent in materials. It is important to select the most adequate model that is capable of representingthe dynamic hardening characteristics of a material accurately.
In this paper, the fitting characteristics of several well-known models are investigated and verifiedby experiments at a wide range of strain rates. By comparing the characteristics of the models withexperimental results, the effective selecting of the most adequate model has been carried out to applyexperimental stress–strain curves to the numerical analysis accurately and effectively. Several hardeningmodels reported have been investigated and evaluated using the dynamic hardening characteristics ofthree kinds of materials: 4340Steel (BCC); OFHC (FCC); and Ti6Al4V (HCP). Three well-known modelshave been constructed and evaluated for the Johnson–Cook model, the Zerilli–Armstrong model, and thePreston–Tonks–Wallace model using the test results of three materials. Several models suggested by theauthors have also been compared for the modified Johnson–Cook model and the modified Khan–Huangmodel. Another novel dynamic hardening model is newly proposed and compared to the other models.The changes in the strain rate and the temperature during the deformation process were considered forthe accurate application of the hardening models. The most applicable model for each material has beensuggested by comparison of results investigated.