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针对Yoshida-Uemori模型参数难于确定的问题,以DP600双相高强钢为例,提出将图解法与有限元模拟反演技术相结合,应用工程优化数学思想,借助于模拟退火算法最小化有限元计算值与物理试验真实值之差,兼顾结果精度与求解效率。通过使用不同初始值反演分析可以发现,此求解方法对于初始值具有良好的适应性,可极大提升反演结果的容错率,更适于实际应用。并通过V型弯曲试验验证了经由该方法测定的Y-U模型参数可直接用于有限元回弹仿真模拟中。
In view of the difficulty of determining Yoshida-Uemori model parameters, taking DP600 high-strength double-phase steel as an example, it is proposed to combine the graphic method with the finite element simulation inversion technique and to apply the engineering optimization mathematical theory and the simulated annealing algorithm to minimize the finite element calculation The difference between the true value of the value and the physical test, taking into account the accuracy of results and efficiency of solution. By using different initial value inversion analysis, it can be found that the solution method has good adaptability to the initial value, which can greatly improve the fault tolerance of the inversion result and is more suitable for practical application. Through the V-shaped bending test, it is verified that the Y-U model parameters determined by the method can be directly used in the finite element springback simulation.