The Evaluation of Ductile Fracture Criteria (DFC) of 6061-T6 Aluminum Alloy

2010 ◽  
Vol 44-47 ◽  
pp. 2837-2841 ◽  
Author(s):  
Ying Tong
Keyword(s):  
Aluminum Alloy ◽  
Ductile Fracture ◽  
Metal Forming ◽  
True Strain ◽  
Mutual Support ◽  
Fracture Criteria ◽  
Forming Process ◽  
Forming Simulation ◽  
Ductile Fracture Criteria ◽  
Metal Forming Process

As one of the principal failures, ductile fracturing restricts metal forming process. Cockcroft-Latham fracture criterion is suited for tenacity fracture in bulk metal-forming simulation. An innovative approach involving physical compression experiments, numerical simulations and mathematic computations provides mutual support to evaluate ductile damage cumulating process and ductile fracture criteria (DFC). The results show that the maximum cumulated damage decreases with strain rate rising, and the incremental ratios, that is damage sensitive rate, vary uniformly during the upsetting processes at different strain rates. The damage sensitive rate decreases rapidly, then it becomes stability in a constant 0.11 after true strain -0.85. The true strain -0.85 was assumed as the fracture strain, and the DFC of 6061-T6 aluminum alloy is almost a constant 0.2. According to DFC, the exact fracture moment and position during various forming processes will be predicted conveniently.

Fracture analysis on U-bending of AA6061 aluminum alloy sheet using phenomenological ductile fracture criteria

2020 ◽  
Vol 148 ◽  
pp. 106566 ◽  
Author(s):  
Hossein Talebi-Ghadikolaee ◽  
Hassan Moslemi Naeini ◽  
Mohammad Javad Mirnia ◽  
Mohammad Ali Mirzai ◽  
Hamid Gorji ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Ductile Fracture ◽  
Fracture Analysis ◽  
Alloy Sheet ◽  
Aluminum Alloy Sheet ◽  
Fracture Criteria ◽  
Ductile Fracture Criteria

Effective Forming Processes of Hub Forging from Aluminum Alloy AlCu2SiMn

2013 ◽  
Vol 773-774 ◽  
pp. 115-118
Author(s):  
Andrzej Gontarz
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Aluminum Alloy ◽  
Metal Forming ◽  
Material Flow ◽  
Theoretical Research ◽  
Material Consumption ◽  
Forming Process ◽  
Metal Forming Process ◽  
Large Material

This paper presents results of theoretical and experimental research works on metal forming process of a hub. A typical technology of forging on hammer of this part with flash was discussed. Two new processes of a hub forging were proposed, characterized by large material savings in comparison with typical technology. The first process is based on forming without flash of a forging with axial cavity. The second one is connected with forming of forging from pipe billet. The realization of these processes is possible at the application of a press with three movable working tools. Theoretical research works were done on the basis of simulations by means of finite element method. Simulations were made mainly in order to determine kinematics of material flow in forging processes and precision of shape and dimensions of obtained products. The first of the proposed processes was experimentally verified and a product of good quality was obtained. Material consumption of the analyzed processes and other factors acting on their effectiveness were also compared.

Deformation Rule of 7150 Aluminum Alloy Thick Plate by Pre-Stress Shot Peen Forming

2014 ◽  
Vol 1052 ◽  
pp. 477-481 ◽  
Author(s):  
Ming Tao Wang ◽  
Yuan Song Zeng ◽  
Xue Piao Bai ◽  
Xia Huang
Keyword(s):  
Aluminum Alloy ◽  
Metal Forming ◽  
Thick Plate ◽  
Radius Of Curvature ◽  
Al Alloy ◽  
Forming Process ◽  
Peen Forming ◽  
Metal Forming Process ◽  
Aeronautical Industry ◽  
Different Thickness

Pre-stress shot peen forming is a metal forming process widely used in aeronautical industry. The test parts of 7150 Al alloy of different thickness were pre-stress shot peen formed. The deformation rule of those parts was investigated by means of changing the peening coverage. The results show that the radius of curvature of the parts will enhance gradually with increasing of the plate’s thickness. In addition, enhancing peening coverage could raise the deformation in the case of that the thickness and peening parameters are unchanged. Furthermore, the minimum radius of curvature of the 8mm plate after saturation pre-stress shot peen forming could reach 499mm.

Effective Forming Processes of Hub Forging from Aluminum Alloy AlCu2SiMn

2013 ◽  
Vol 572 ◽  
pp. 265-268
Author(s):  
Andrzej Gontarz
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Aluminum Alloy ◽  
Metal Forming ◽  
Material Flow ◽  
Theoretical Research ◽  
Material Consumption ◽  
Forming Process ◽  
Metal Forming Process ◽  
Large Material

This paper presents results of theoretical and experimental research works on metal forming process of a hub. A typical technology of forging on hammer of this part with flash was discussed. Two new processes of a hub forging were proposed, characterized by large material savings in comparison with typical technology. The first process is based on forming without flash of a forging with axial cavity. The second one is connected with forming of forging from pipe billet. The realization of these processes is possible at the application of a press with three movable working tools. Theoretical research works were done on the basis of simulations by means of finite element method. Simulations were made mainly in order to determine kinematics of material flow in forging processes and precision of shape and dimensions of obtained products. The first of the proposed processes was experimentally verified and a product of good quality was obtained. Material consumption of the analyzed processes and other factors acting on their effectiveness were also compared.

Effect of Shot Peen Forming with Large Balls on Fatigue Resistance of 2024-T351 Aluminum Alloy

2013 ◽  
Vol 816-817 ◽  
pp. 266-270
Author(s):  
Ming Tao Wang ◽  
Yuan Song Zeng ◽  
Jian Qin Shang ◽  
Xia Huang ◽  
Xue Piao Bai
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Resistance ◽  
Shot Peening ◽  
Metal Forming ◽  
Forming Process ◽  
Surface Strengthening ◽  
Peen Forming ◽  
Different Types ◽  
Metal Forming Process ◽  
Aeronautical Industry

Shot peen forming different from shot peening is a metal forming process widely used in aeronautical industry. Different types of tension-tension fatigue specimens after peen forming were tested. The results show that the fatigue life of specimens peen formed with large balls except edges is 35.4% higher than that of unpeened specimens, while the life of the specimens with whole surface peen formed is 23.2% lower than that of the unpeened specimens. In addition, shot peening specimens which have been peen formed as a surface strengthening way can significantly improve the fatigue resistance. Moreover, when the specimen is peen formed except edges, the position of crack source is from the indentation region to subsurface.

A Note on Ductile Fracture Criteria in Metal Forming

2010 ◽  
Vol 132 (2) ◽  
Author(s):  
Sergei Alexandrov ◽  
Lihui Lang
Keyword(s):  
Ductile Fracture ◽  
Metal Forming ◽  
Fracture Criterion ◽  
Ductile Fracture Criterion ◽  
Hot Metal ◽  
Fracture Criteria ◽  
Material Models ◽  
Analysis And Design ◽  
Ductile Fracture Criteria ◽  
Forming Analysis

This paper deals with some general properties of a ductile fracture criterion, which generalizes two ductile fracture criteria conventionally adopted for metal forming analysis and design. The results are valid for a wide class of material models applicable to both cold and hot metal formings. It is expected that the theoretical features of the fracture criterion emphasized in the present paper can be useful for its experimental verification or for determining its parameters from the experiment.

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