(中铝材料应用研究院有限公司，北京 102209)
摘 要: 在D、F两种底模作用下，采用4种长度的铆钉(5.0 mm、5.5 mm、6.0 mm和6.5 mm)对5182-O铝合金板材1.5 mm+1.5 mm组合接头进行自冲铆接试验，对接头剖切面进行关键特征值测量，利用EBSD、硬度测试及拉伸试验对接头的组织和强度、吸能进行了研究；并基于5182-O板材在不同应变速率下的本构模型及Johnson-Cook损伤模型，建立自冲铆接成形过程模型，并与试验结果进行对比验证。结果表明：随着铆钉长度的增加，接头的强度、吸能呈先提高后降低的变化趋势，铆钉长度为6.0 mm时，接头性能最佳；在相同铆钉长度下，D组接头力学性能明显高于F组，原因是D组接头板材变形程度明显大于F组，加工硬化程度更高。利用DEFORM-2D软件对自冲铆接成形过程进行模拟，仿真结果与真实试验误差在15%以内，验证了模型的准确性。
关键字: 5182-O铝合金；自冲铆接；力学性能；电子背散射衍射；变形组织
（CHINALCO Materials and Application Research Institute, Beijing 102209, China）
Abstract:Under the actions of D-die and F-die, four lengths of rivets (5.0 mm, 5.5 mm, 6.0 mm and 6.5 mm) were used to conduct self-piercing riveting tests on the joints of 1.5 mm+1.5 mm 5182-O aluminum alloy plates. The key characteristic values were measured on the profiles of the joints. The microstructure and mechanical properties of the joints were studied by using EBSD, hardness tests and tensile tests. Based on the constitutive models of 5182-O plates under different strain rates and the Johnson-Cook damage model, the forming process of self-piercing riveting was established and the simulation results were compared with the experimental results for verification. The results show that the mechanical properties of the joints increase firstly and then decrease with the increase of rivet length. When the length is 6.0mm, the mechanical properties of the joints are optimum. Under the same length of rivet, the mechanical properties of joints in group D are significantly higher than those in group F. The degree of deformation in group D is obviously higher than that in group F, resulting in higher work-hardening capacity. Software DEFORM-2D was adopted to establish the forming model of self-piercing riveting. The simulation results show an error of less than 15%, compared with the results by experiment, which verifies the accuracy of the model.
Key words: 5182-O aluminum alloy; self-piercing riveting; mechanical properties; EBSD; deformation microstructure
