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进行了6个国产6063-T5铝合金试样拉伸试验,测得其应力-应变关系曲线,并与Ramberg-Osgood模型进行了对比。结果表明,Ramberg-Osgood模型可较准确描述国产6063-T5铝合金材料的力学性能。通过对4种截面类型共10根闭口加劲薄壁国产6063-T5铝合金试件进行轴压试验,获得了各试件荷载-轴向位移曲线、荷载-板件平面外变形曲线以及荷载-应变曲线,得到其承载力和破坏形态。结果表明,各试件均发生局部屈曲与塑性屈服耦合破坏。采用有限元分析方法对试件进行模拟,模拟结果与试验结果的对比表明,所建立的有限元模型可以较准确预测铝合金试件的承载力和破坏形态。采用现行美国、欧洲、中国的铝合金结构设计规范、美国冷弯薄壁钢结构设计规范及直接强度法对所研究试件的承载力进行计算,计算结果与试验结果的对比表明,各规范设计方法基本适用于闭口加劲薄壁铝合金轴压构件局部屈曲设计。直接强度法计算结果与实测承载力比值约为1.20,表明目前直接强度法高估了闭口加劲薄壁截面铝合金轴压构件承载力,因此需对其修正才可用于该类闭口加劲薄壁截面铝合金轴压构件的承载分析。
Tensile tests on six domestic 6063-T5 aluminum alloy specimens were carried out. The stress-strain curves were obtained and compared with the Ramberg-Osgood model. The results show that the Ramberg-Osgood model can accurately describe the mechanical properties of domestic 6063-T5 aluminum alloy. Through the axial compression tests on a total of 10 closed stiffened domestic 6063-T5 aluminum alloy specimens of 4 cross-section types, the load-axial displacement curves, load-plate out-of-plane deformation curves and load- Curve, get its bearing capacity and destruction form. The results show that local buckling and plastic yield coupling failure occur in all specimens. The finite element analysis method was used to simulate the specimen. The comparison between simulation results and experimental results shows that the finite element model can predict the bearing capacity and failure mode of aluminum alloy specimen more accurately. The bearing capacity of the test specimen was calculated by the current design code of aluminum alloy structure in the United States, Europe and China, the design code of cold-formed thin-walled steel structure in the USA and the direct strength method. Comparing the calculation results with the test results, It is suitable for local buckling design of axially stiffened thin-walled aluminum alloy axial compression members. The result of direct strength method and the measured bearing capacity ratio is about 1.20, which shows that the direct strength method overestimates the bearing capacity of the axially stiffened thin-walled aluminum alloy axial compression member so that the correction can only be used for this kind of closed stiffened thin-walled section Bearing Analysis of Aluminum Alloy Axial Compression Members.