(中鋁材料應(yīng)用研究院有限公司，北京 102209)
摘 要: 在D、F兩種底模作用下，采用4種長(zhǎng)度的鉚釘(5.0 mm、5.5 mm、6.0 mm和6.5 mm)對(duì)5182-O鋁合金板材1.5 mm+1.5 mm組合接頭進(jìn)行自沖鉚接試驗(yàn)，對(duì)接頭剖切面進(jìn)行關(guān)鍵特征值測(cè)量，利用EBSD、硬度測(cè)試及拉伸試驗(yàn)對(duì)接頭的組織和強(qiáng)度、吸能進(jìn)行了研究；并基于5182-O板材在不同應(yīng)變速率下的本構(gòu)模型及Johnson-Cook損傷模型，建立自沖鉚接成形過(guò)程模型，并與試驗(yàn)結(jié)果進(jìn)行對(duì)比驗(yàn)證。結(jié)果表明：隨著鉚釘長(zhǎng)度的增加，接頭的強(qiáng)度、吸能呈先提高后降低的變化趨勢(shì)，鉚釘長(zhǎng)度為6.0 mm時(shí)，接頭性能最佳；在相同鉚釘長(zhǎng)度下，D組接頭力學(xué)性能明顯高于F組，原因是D組接頭板材變形程度明顯大于F組，加工硬化程度更高。利用DEFORM-2D軟件對(duì)自沖鉚接成形過(guò)程進(jìn)行模擬，仿真結(jié)果與真實(shí)試驗(yàn)誤差在15%以內(nèi)，驗(yàn)證了模型的準(zhǔn)確性。
關(guān)鍵字: 5182-O鋁合金；自沖鉚接；力學(xué)性能；電子背散射衍射；變形組織
（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
