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射频固态焊接参数对7075-T6包铝铝合金接头拉伸剪切断裂载荷影响的研究。

Investigation into the Effect of RFSSW Parameters on Tensile Shear Fracture Load of 7075-T6 Alclad Aluminium Alloy Joints.

作者信息

Kubit Andrzej, Trzepieciński Tomasz, Gadalińska Elżbieta, Slota Ján, Bochnowski Wojciech

机构信息

Department of Manufacturing and Production Engineering, Rzeszow University of Technology, al. Powst. Warszawy 8, 35-959 Rzeszów, Poland.

Department of Materials Forming and Processing, Rzeszow University of Technology, al. Powst. Warszawy 8, 35-959 Rzeszów, Poland.

出版信息

Materials (Basel). 2021 Jun 19;14(12):3397. doi: 10.3390/ma14123397.

DOI:10.3390/ma14123397
PMID:34205245
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8234869/
Abstract

The aim of the investigations was to determine the effect of parameters of refill friction stir spot welding (RFSSW) on the fracture load and failure mechanisms of the resulting joint. RFSSW joints were made in 7075-T6 Alclad aluminium alloy sheets using different welding parameters. The load capacity of joints was determined under tensile/shear loadings. Finite element-based numerical simulations of the joint-loading process were carried out, taking into account the variability of elasto-plastic properties of weld material through the joint cross-section. The influence of welding parameters on selected phenomena occurring during the destruction of the joint is presented. The considerations were supported by a fractographic analysis based on SEM images of fractures. It was found that there is a certain optimal amount of heat generated, which is necessary to produce the correct joint in terms of its load capacity. This value should not be exceeded, because it leads to weakening of the base material and thus to a reduction in the strength of the joint. Samples subjected to uniaxial tensile shear load showed three types of failure mode (tensile fracture, shear fracture, plug type fracture) depending on the tool rotational speed and duration of welding. Prediction of the fracture mode using FE-based numerical modelling was consistent with the experimental results. The samples that were damaged due to the tensile fracture of the lower sheet revealed a load capacity (LC) of 5.76 KN. The average value of LC for the shear fracture failure mechanism was 5.24 kN. The average value of the LC for plug-type fracture mode was 5.02 kN. It was found that there is an optimal amount of heat generated, which is necessary to produce the correct joint in terms of its LC. Excessive overheating of the joint leads to a weakening of the base metal and thus a reduction in the strength of the joint. Measurements of residual stresses along the axis specimens showed the presence of stresses with a certain constant value for the welded area on the side of the 1.6 mm thick plate.

摘要

这些研究的目的是确定再填充搅拌摩擦点焊（RFSSW）参数对所得接头的断裂载荷和失效机制的影响。使用不同的焊接参数在7075-T6包铝铝合金板材上制作RFSSW接头。在拉伸/剪切载荷下测定接头的承载能力。考虑到焊接材料在接头横截面中的弹塑性特性的变化，对接头加载过程进行了基于有限元的数值模拟。介绍了焊接参数对接头破坏过程中发生的选定现象的影响。基于扫描电子显微镜（SEM）断口图像的断口分析为这些研究提供了支持。研究发现，存在一定的最佳产热，这对于产生具有正确承载能力的接头是必要的。该值不应超过，因为这会导致母材弱化，从而降低接头强度。承受单轴拉伸剪切载荷的样品根据工具转速和焊接持续时间表现出三种失效模式（拉伸断裂、剪切断裂、塞型断裂）。使用基于有限元的数值建模预测断裂模式与实验结果一致。因下层板材拉伸断裂而损坏的样品的承载能力（LC）为5.76 kN。剪切断裂失效机制的LC平均值为5.24 kN。塞型断裂模式的LC平均值为5.02 kN。研究发现，存在一个最佳产热，这对于产生具有正确LC的接头是必要的。接头过度过热会导致母材弱化，从而降低接头强度。沿试样轴线测量残余应力表明，在1.6 mm厚板材一侧的焊接区域存在一定恒定值的应力。

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