Various studies show that application of kinematic hardening models significantly improves the accuracy of springback simulation in sheet metal forming. The springback simulation using kinematic hardening models, e.g., the Yoshida-Uemori (YU) model, is highly dependent on the testing strategy and the calibration of model parameters. In this study, the effect of tension-compression (T-C) testing strategy on calibration of YU model parameters and springback simulation of advanced high strength steels was investigated. A single-element model with T-C conditions was built in LS-OPT to determine YU model parameters on the basis of T-C tests. U-bending tests of two 980 MPa grade steels were performed to evaluate the springback prediction. Results indicate that T-C strategies, including tension-compression sequence and prestrain level show little effect on the calibrated YU model parameters as well as springback simulation of a dual phase steel DP980. However, for a TRIP-assisted high strength steel QP980, T-C strategy significantly affects both the YU model parameters and springback simulation, which is related to the complex loading-path-dependent retained austenite transformation in the QP980. A compromise strategy of T-C testing is proposed to calibrate the YU model parameters of the steel QP980, which are capable to accurately simulate its springback in U-bending.

各种研究表明，运动硬化模型的应用显着提高了钣金成形中回弹模拟的准确性。使用运动硬化模型（例如，吉田植森（YU）模型）的回弹模拟高度依赖于测试策略和模型参数的校准。在这项研究中，研究了拉伸压缩（TC）测试策略对YU模型参数校准和高级高强度钢回弹模拟的影响。在LS-OPT中建立了具有TC条件的单元素模型，以便在TC测试的基础上确定YU模型参数。进行了两种980 MPa级钢的U型弯曲试验，以评估回弹预测。结果表明TC策略 拉伸-压缩顺序和预应变水平等参数对双相钢DP980的校正YU模型参数以及回弹模拟影响很小。但是，对于TRIP辅助高强度钢QP980，TC策略会显着影响YU模型参数和回弹模拟，这与QP980中依赖于载荷路径的复杂残余奥氏体转变有关。提出了一种TC测试的折衷策略，以校准QP980钢的YU模型参数，该参数能够精确地模拟U形弯曲中的回弹。这与QP980中依赖于加载路径的复杂残余奥氏体转变有关。提出了一种TC测试的折衷策略来校准QP980钢的YU模型参数，该参数能够准确地模拟其在U形弯曲中的回弹。这与QP980中依赖于加载路径的复杂残余奥氏体转变有关。提出了一种TC测试的折衷策略来校准QP980钢的YU模型参数，该参数能够准确地模拟其在U形弯曲中的回弹。