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| 基于弯曲实验的DP980力学性能研究 |
| Study on Mechanical Properties of DP980 Based on Bending Test |
| Received:June 20, 2021 |
| DOI：10.3969/j.issn.1674-6457.2021.05.016 |
| 中文关键词: 高强钢DP980 弯曲实验 材料模型 有限元仿真 |
| 英文关键词: high-strength steel DP980 bending test material model finite element simulation analysis |
| 基金项目:北京市自然科学基金-市教委联合资助(KZ201910009011);京市属高校高水平教师队伍建设长城学者培养计划(CIT&TCD20190306);国家自然科学基金和上海宝钢集团公司联合资助(51074204);北京市教委基本科研业务费项目(110052972027/024) |
| Author Name | Affiliation | | HAN Fei | School of Mechanical and Materials Engineering, North University of Technology, Beijing 100144, China | | ZHANG Shuai | School of Mechanical and Materials Engineering, North University of Technology, Beijing 100144, China | | WANG Hong-liang | School of Mechanical and Materials Engineering, North University of Technology, Beijing 100144, China | | MU Si-chao | School of Mechanical and Materials Engineering, North University of Technology, Beijing 100144, China |
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| 中文摘要: |
| 目的 针对仅通过单向拉伸实验无法准确表征金属板材在弯曲成形过程中的力学性能变化的问题，研究通过弯曲实验获取材料力学性能参数。方法 对高强钢DP980展开力学性能测试研究，主要通过弯曲实验对材料弯曲变形过程中形成的弯矩曲率进行测试，将得到的弯矩曲率转化为应力-应变。分别将弯曲和拉伸得到的应力-应变数据导入到三点弯和辊弯成形有限元仿真中，预测板材的成形角度。结果 DP980弯曲变形时的屈服强度要大于轴向拉伸时的屈服强度;分别利用弯曲和拉伸实验测得的应力-应变数据进行仿真，与三点弯实验结果对比发现，采用弯曲实验得到的应力-应变数据对回弹量的预测偏大，而利用拉伸实验得到的应力-应变数据进行仿真，仿真得到的回弹量则偏小，弯曲实验下变形过程中的应变变化数据更加符合真实过程，与辊弯实验对比发现，利用弯曲实验数据进行仿真可以更准确地预测V形板的最终成形角度。结论 相较于单向拉伸实验，通过弯曲实验获取的材料力学性能参数可以更准确地描述材料在三点弯、辊弯成形过程中的力学性能变化。 |
| 英文摘要: |
| The mechanical properties of the sheet metal during bending and forming cannot be accurately characterized by the unidirectional tensile test alone. The mechanical properties of high-strength steel DP980 were tested by bending experiments to determine the bending moment curvature formed during the bending deformation of the material, and the obtained bending moment curvature was converted into stress-strain. The stress-strain data obtained from bending and tension were imported into the finite element simulation of three-point bending and roll bending respectively to predict the forming angle of the plate. The yield strength of DP980 in bending deformation was greater than that in axial tension; the stress-strain data measured by bending and tension experiments were used for simulation respectively, and the comparison with the results of three-point bending experiments showed that the stress-strain data obtained by using bending experiments predicted the rebound amount to be large, while the simulation obtained by using the stress-strain data obtained by tension experiments showed the rebound amount to be small. The strain change data during the deformation under the bending experiment is more consistent with the real process, and the comparison with the roll bending experiment reveals that the simulation using the bending experiment data can predict the final forming angle of the V-shaped plate more accurately. Compared with the unidirectional tensile test, the mechanical property parameters obtained by the bending test can more accurately describe the mechanical property changes of the material in the three-point bending and roll bending forming process. |
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