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Asymmetric mechanical properties and tensile behaviour prediction of aluminium alloy 5083 friction stir welding joints

机译:铝合金5083搅拌摩擦焊接头的不对称力学性能和拉伸行为预测

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摘要

The asymmetric material flow, severe plastic deformation and thermal cycle imposed on the base material during friction stir welding (FSW) result in unique microstructural development, which causes a gradient in local mechanical properties in the weld region. Micro-tensile and indentation testing were applied to determine the local mechanical properties in a friction stir welded joint. The local stress-strain curves exhibited a drastic change at the advancing side (AS) due to a steep gradient of mechanical properties. Finite Element Model (FEM) predictions of the tensile performance of the welded joints, based on the local mechanical properties measured by micro-tensile testing, were in very good agreement with the macro-tensile test data.
机译:搅拌摩擦焊(FSW)期间,不对称的材料流动,剧烈的塑性变形和施加在基础材料上的热循环导致独特的微观结构发展,从而导致焊接区域局部机械性能出现梯度。应用微拉伸和压痕测试来确定搅拌摩擦焊接接头的局部机械性能。由于机械性能的陡峭梯度,局部应力-应变曲线在前进侧(AS)呈现出剧烈变化。基于通过微拉伸试验测得的局部力学性能,对焊接接头拉伸性能的有限元模型(FEM)预测与宏观拉伸试验数据非常吻合。

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