(3) 針對先進高強度鋼(590Y、780Y、980Y 及 1180Y)進行雙軸向拉伸實驗。利 用雙軸拉伸實驗之數據，將各鋼種在不同塑性應變下之雙軸降伏應力繪製於 理論降伏面上，其中 Hill 90 降伏準則與 Yld2000-2d 降伏準則之降伏軌跡較 接近雙軸拉伸之實驗值。
(4) 本研究亦進行基礎載具沖壓成形分析與實驗驗證。根據基礎載具之分析結果，
Yld2000-2d 降伏準則較適合用於先進高強度鋼板之成形分析。
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