An Experimental Evaluation of Electron Beam Welded Thixoformed 7075 Aluminum Alloy Plate Material

A 3D elastic-plastic and coupled thermo-mechanical FE model for friction stir welding(FSW) of 7075 aluminum alloy plate was developed based on the dynamic explicit code ABAQUS/explicit, then the FSW process of 7075 aluminum alloy plate was simulated and the materials flow behavior was analyzed. The results show that in the horizontal direction of the plate, two patterns of materials migration are produced: (1) the material rotates with the tool and finally deposits the tentative cavity behind the pin; (2) the material transfers in the mode of laminar flow. Furthermore, the streamlines of material in advanced side (AS) are bent along the reverse welding direction. After bypassing the pin, the material of retreating side (RS) moves backward it, and extends to AS.

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Study of mechanical behavior by fatigue of a cracked plate repaired by different composite patches

Frattura ed Integrità Strutturale ◽

10.3221/igf-esis.56.16 ◽

2021 ◽

Vol 15 (56) ◽

pp. 195-202

Author(s):

Abdelmadjid Moulgada ◽

Djafar Ait kaci ◽

Mohammed El Sallah Zagane ◽

Sahli Abderrahmane ◽

Rachid Zahi

Keyword(s):

Aluminum Alloy ◽

Mechanical Behavior ◽

Fatigue Behavior ◽

Load Ratio ◽

Tensile Loading ◽

Plate Material ◽

Alloy Plate ◽

Loading Effect ◽

Central Crack ◽

Aluminum Alloy Plate

This research is based on the study of the fatigue behavior of an aluminum alloy plate with a central crack. The plate is subjected to a tensile loading on its lower and upper parts. Several parameters were highlighted, such as the loading effect with a load ratio R = 0. The effects of the load ratio on both the repaired and not repaired plates, by two composite patches, which are boron/epoxy and graphite/epoxy, were investigated, as well as the effect of the plate material on plate life, comparing different materials

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A 3D Coupled Thermo-Mechanical FE Model for Friction Stir Welding of 7075 Aluminum Alloy Plate

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.314-316.346 ◽

2011 ◽

Vol 314-316 ◽

pp. 346-350 ◽

Cited By ~ 1

Author(s):

Zheng Hua Guo ◽

Gang Yao Zhao ◽

Li Ming Ke ◽

Li Xing ◽

Shun Feng Zhu

Keyword(s):

Plastic Deformation ◽

Aluminum Alloy ◽

Friction Stir Welding ◽

Bottom Surface ◽

Fe Model ◽

7075 Aluminum Alloy ◽

Alloy Plate ◽

Friction Stir ◽

Plastic Deformation Behavior ◽

Aluminum Alloy Plate

Friction stir welding(FSW), a new solid-state joining process, is wildly used in the fields of aviation, aerospace and other high technology industries for many advantages over traditional fusion welding. Computer modeling is an important tool for the prediction and optimization of the FSW process. According to the characteristics of FSW of 7075 aluminum alloy plate, a 3D coupled thermo-mechanical FE model of this process was built under the ABAQUS/explicit environment based on the solution of several key techniques, such as heat boundary condition treating, material properties definition, ALE adaptive meshing technology, etc., and validated experimentally. Then, simulation and analysis of the complex plastic deformation behavior of the process were carried out. The results show that in the stable stage of the welding, the zone of equivalent plastic deformation decreases from the top surface of weld to the bottom surface; the plastic deformation of metal ahead of the welding tool is larger than that behind the welding tool; moreover the zone of equivalent plastic deformation is concentrated behind the tool.

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