A semi-analytical model for inverse identification of cyclic material data from measured forces during roller levelling
A semi-analytical model for inverse identification of cyclic material data from measured forces during roller levelling
复制标题
一种半解析模型，用于根据滚轮矫直过程中测得的力反演循环材料数据
DOI：
10.1016/j.promfg.2019.02.157
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
G. Hirt
中科院分区：
文献类型：
--
作者：
M. Grüber;G. Hirt
辊式矫直工艺对于确保金属板的平整度和减少材料内的残余应力至关重要。除了机器几何形状和轧辊位置等工艺参数外，该工艺对材料特性的变化也很敏感。为了检测材料特性的变化，需要从测量的过程数据中逆识别材料参数。因此，引入了一个基于弯曲理论的半解析调平模型，该模型能够描述材料在低周反复荷载下的行为。该模型根据给定的材料数据计算调平力。在一个优化循环内采用该模型，该模型允许通过比较计算的和测量的调平力在调平过程中的材料数据的逆确定。为了验证模型，伴随的有限元（FE）模拟，调平实验以及循环弯曲试验进行。根据计算结果，半解析模型能够计算调平力与有限元结果吻合良好，计算时间要少得多。此外，直接从调平实验获得的材料数据与从循环弯曲试验确定的数据在相同的范围内。
The process of roller levelling is essential to ensure flatness of sheet metals and to reduce residual stresses within the material. Besides process parameters like machine geometry and roll positions, the process is sensitive to variations of material properties. In order to detect variations of the material properties, an inverse identification of material parameters from measured process data is desirable. Therefore, a semi-analytical levelling model based on bending theory that is capable to describe material behavior under low cyclic loading is introduced. This model calculates the levelling forces depending on given material data. Employing the model within an optimization loop, the model allows for an inverse determination of material data during levelling by comparing calculated and measured levelling forces. To validate the model, accompanying finite element (FE) simulations, levelling experiments as well as cyclic bending tests are performed. According to the results, the semi-analytical model is capable of calculating levelling forces in good agreement with FE results and much lower computation times. Furthermore, material data obtained directly from levelling experiments are in the same range as data determined from cyclic bending tests.