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<p>This study investigates the mechanical properties and formability of 980MPa ultra-high-strength steels, specifically CR980DP and SPFC980 sheets. Uniaxial tensile tests were performed to assess their mechanical behavior and hardening characteristics, indicating similar properties for both materials. Despite this similarity, the experimental forming limit diagram (FLD) of SPFC980 evaluated from Nakazima tests demonstrates significantly greater formability compared to CR980DP. To model the material behavior under plane-stress conditions, Barlat’s Yld2000-2d yield function and Swift hardening law were employed. The calibrated material models were implemented in a Python framework to predict theoretical forming limit curves (FLCs) using an enhanced modified maximum force criterion. The predicted FLCs for both materials were nearly identical and aligned closely with the experimental FLC of CR980DP. To explore SPFC980’s superior formability, finite element (FE) simulations of the Nakazima tests were conducted, which reproduced the experimental FLCs for both materials properly. Comparison between the FE-based and theoretical FLCs reveals interplay effects of material thickness and friction on the formability of sheet metals.</p>

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Characterization of mechanical properties and formability of 980 mpa grade high-strength steel sheet

  • 期刊论文

  • 发表日期：

    2025年11月18日

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  • Jong-Kyu Park,
  • Duy-Tung Do,
  • Yun-Hak Tak,
  • Young-Suk Kim,
  • Dinh Van Tran,
  • Duc Toan Nguyen,
  • Quoc Tuan Pham

摘要

This study investigates the mechanical properties and formability of 980MPa ultra-high-strength steels, specifically CR980DP and SPFC980 sheets. Uniaxial tensile tests were performed to assess their mechanical behavior and hardening characteristics, indicating similar properties for both materials. Despite this similarity, the experimental forming limit diagram (FLD) of SPFC980 evaluated from Nakazima tests demonstrates significantly greater formability compared to CR980DP. To model the material behavior under plane-stress conditions, Barlat’s Yld2000-2d yield function and Swift hardening law were employed. The calibrated material models were implemented in a Python framework to predict theoretical forming limit curves (FLCs) using an enhanced modified maximum force criterion. The predicted FLCs for both materials were nearly identical and aligned closely with the experimental FLC of CR980DP. To explore SPFC980’s superior formability, finite element (FE) simulations of the Nakazima tests were conducted, which reproduced the experimental FLCs for both materials properly. Comparison between the FE-based and theoretical FLCs reveals interplay effects of material thickness and friction on the formability of sheet metals.