对2017铝合金进行搅拌摩擦焊接,表述SwiR硬化规律.采用面心复合设计方法进行焊接接头的拉伸实验设计.采用基于最小二乘法和响应面法的2种模型评估搅拌摩擦焊各焊接因素对硬化参数的影响.采用到有限元程序Abaqus来模拟焊接接头拉伸测试结果.相对平均偏差判据结果表明,实验结果和模拟结果吻合较好.这些结果能用于实验多目标优化,实行具体焊接或完成搅拌摩擦焊接零件成形过程中塑性变形的数值模拟,如液压成形、弯曲度和锻造.
An experimental study was undertaken to express the hardening Swift law according to fiictien stir welding (FSW)aluminum alloy 2017.Tensile tests of welded joints were run in accordance with face centered composite design.Two types of identified models based on least square method and response surface method were used to assess the contribution of FSW independent factors on the hardening parameters.These models were introduced into finite-element code "Abaqus" to simulate tensile tests of welded joints.The relative average deviation criterion,between the experimental data and the numerical simulations of tension-elongation of tensile tests,shows good agreement between the experimental results and the predicted hardening models.These results can be used to perform multi-criteria optimization for carrying out specific welds or conducting numerical simulation of plastic deformation of forming process of FSW parts such as hydroforming,bending and forging.
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