Method for Determining the Flow Curve of Material Considering Work Hardening Behavior

DOI Web Site 8 References
  • SUZUKI Atsushi
    日本製鉄（株） 関西技術研究部
  • OKAMURA Kazuo
    元：日本製鉄（株） 技術開発本部　現在：大阪大学 日本製鉄材料基礎協働研究所
  • KADA Osamu
    日本製鉄（株） 鉄鋼研究所

Bibliographic Information

Other Title
  • 材料の加工硬化特性を考慮した変形抵抗曲線取得方法
  • ―I Effect of Swift-Type Work Hardening Behavior on Calibration Curves―
  • ―第1報　Swift型加工硬化特性が校正曲線に及ぼす影響―

Abstract

<p>The flow curve determination method proposed by Osakada uses two calibration curves to convert the load-reduction in height relationship in an upsettability test into a flow curve. To improve the accuracy of the flow curve, we investigated the effect of work hardening on the calibration curves. We assumed that virtual materials follow the Swift hardening equation, and we performed finite element method analysis on these materials by assuming various material constants of the Swift hardening equation. We found that the work hardening behavior affects the calibration curve for the average equivalent strain, but not that for the restraint factor. We formulated these new calibration curves by polynomials. We proposed a new flow curve determination method based on new formulated calibration curves and an optimization method. This method determines an accurate flow curve after automatically selecting a calibration curve for an appropriate average equivalent strain for various materials according to their work hardening behaviors. We showed that highly accurate flow curves can be obtained by applying the proposed method regardless of the work hardening behavior.</p>

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