Fabrication of Sandwich Structure with Superplastic Forming Process from Diffusion Bonded Ti-6Al-4V Sheets

2007 ◽  
pp. 359-362
Author(s):  
Ho Sung Lee ◽  
Jong Hoon Yoon ◽  
Yeong Moo Yi ◽  
Dong Hyuk Shin
Keyword(s):  
Sandwich Structure ◽  
Superplastic Forming ◽  
Forming Process

Numerical Analysis of Superplastic Forming for Sandwich Structure of 5083 Al-Alloy

2013 ◽  
Vol 739 ◽  
pp. 167-170
Author(s):  
Shou Fa Liu ◽  
Xiao Li Dou ◽  
Song Li Wu
Keyword(s):  
Sandwich Structure ◽  
Thickness Distribution ◽  
Superplastic Forming ◽  
Al Alloy ◽  
Maximum Strain ◽  
Forming Process ◽  
Element Analysis ◽  
Time Curve ◽  
Pressure Time ◽  
5083 Al Alloy

Finite element analysis of superplastic forming process for a hollow sandwich structure of aluminum alloy was carried out with MARC software, which can predict the thickness distribution of the structure, and optimize the pressure-time curve to control the maximum strain rate, which provided reference basis for the forming pressure of the subsequent experiment.

Fabrication of Sandwich Structure with Superplastic Forming Process from Diffusion Bonded Ti-6Al-4V Sheets

2007 ◽  
Vol 26-28 ◽  
pp. 359-362 ◽  
Author(s):  
Ho Sung Lee ◽  
Jong Hoon Yoon ◽  
Yeong Moo Yi ◽  
Dong Hyuk Shin
Keyword(s):  
Solid State ◽  
Diffusion Bonding ◽  
Sandwich Structure ◽  
Superplastic Forming ◽  
Forming Process ◽  
Aerospace Application ◽  
Weight Saving ◽  
Microstructure Observation ◽  
State Diffusion ◽  
Higher Temperature

It is well known that the utilization of superplastic characteristics in manufacturing process makes many of aerospace components lighter and stiffer. The weight saving is vitally important especially for aerospace application and even more weight saving is possible when the superplastic forming is carried out with diffusion bonding. In this study, the lightweight sandwich structure was fabricated with superplastic forming(SPF) process from diffusion bonded(DB) Ti-6Al-4V sheets. The solid state diffusion bonding process was conducted in non-vacuum environment under a pressure of 4MPa for 60 minutes at 875°C and the superplastic forming process was followed for another 40 minutes. Good solid state bonding interface have been observed in microstructure observation and the sandwich structure was successfully manufactured. It is important to note that the forming conditions of present study are more practical for application than the previously published conditions, which require vacuum environment, higher temperature and/or pressure.

Design in Superplastic Forming Process by Rigid Visco Plastic Shell FEM

1996 ◽  
Vol 243-245 ◽  
pp. 735-738 ◽  
Author(s):  
Kai Feng Zhang ◽  
Z.R. Wang ◽  
Xiao Ming Lai ◽  
G.L. Kan
Keyword(s):  
Superplastic Forming ◽  
Plastic Shell ◽  
Forming Process

scholarly journals Optimization of Superplastic Forming Process of AA7075 Alloy for the Best Wall Thickness Distribution

2021 ◽  
Vol 6 (4) ◽  
pp. 251-261
Author(s):  
Manh Tien Nguyen ◽  
Truong An Nguyen ◽  
Duc Hoan Tran ◽  
Van Thao Le
Keyword(s):  
Wall Thickness ◽  
Deformation Temperature ◽  
Numerical Optimization ◽  
Thickness Distribution ◽  
Superplastic Forming ◽  
Forming Process ◽  
Wall Thickness Distribution ◽  
Surface Method ◽  
Series Of Experiments ◽  
The Relationship

This work aims to optimize the process parameters for improving the wall thickness distribution of the sheet superplastic forming process of AA7075 alloy. The considered factors include forming pressure p (MPa), deformation temperature T (°C), and forming time t (minutes), while the responses are the thinning degree of the wall thickness ε (%) and the relative height of the product h*. First, a series of experiments are conducted in conjunction with response surface method (RSM) to render the relationship between inputs and outputs. Subsequently, an analysis of variance (ANOVA) is conducted to verify the response significance and parameter effects. Finally, a numerical optimization algorithm is used to determine the best forming conditions. The results indicate that the thinning degree of 13.121% is achieved at the forming pressure of 0.7 MPa, the deformation temperature of 500°C, and the forming time of 31 minutes.

Numerical and Experimental Investigation on the Hybrid Superplastic Forming of the Conical Mg Alloy Component

2018 ◽  
Vol 385 ◽  
pp. 391-396
Author(s):  
Mei Ling Guo ◽  
Ming Jen Tan ◽  
Xu Song ◽  
Beng Wah Chua
Keyword(s):  
Electron Backscatter Diffraction ◽  
Thickness Distribution ◽  
Superplastic Forming ◽  
Test Results ◽  
Forming Process ◽  
Hyperbolic Sine ◽  
Coarse Grains ◽  
Hot Drawing ◽  
Material Forming ◽  
Backscatter Diffraction

Hybrid superplastic forming (SPF) is a novel sheet metal forming technique that combines hot drawing with gas forming process. Compared with the conventional SPF process, the thickness distribution of AZ31B part formed by this hybrid SPF method has been significantly improved. Additionally, the microstructure evolution of AZ31 was examined by electron backscatter diffraction (EBSD). Many subgrains with low misorientation angle were observed in the coarse grains during SPF. Based on the tensile test results, parameters of hyperbolic sine creep law model was determined at 400 oC. The hybrid SPF behavior of non-superplastic grade AZ31B was predicted by ABAQUS using this material forming model. The FEM results of thickness distribution, thinning characteristics and forming height were compared with the experimental results and have shown reasonable agreement with each other.

Scanning and Modeling of Large Thin-Walled Curved Surface Part

2011 ◽  
Vol 299-300 ◽  
pp. 810-815 ◽  
Author(s):  
Chun Wang ◽  
Xuan Ming Zhang ◽  
Xiao Wang
Keyword(s):  
Sandwich Structure ◽  
Laser Scanner ◽  
Welding Process ◽  
Point Clouds ◽  
Cnc Machining ◽  
Curved Surface ◽  
Surface Model ◽  
Forming Process ◽  
Thin Walled ◽  
Sandwich Core

The large sandwich structure composed of thin-walled aluminum alloy panels, and variable thickness of honeycomb or Polymethacrylimide (PMI) foam core is usually manufactured by pre-bonded forming process, that is pre-forming panels and sandwich core, and then curing adhesive them to be sandwich structure. Welding process of large thin-walled panel causes the panel surface to be irregular and have greater errors relative to the design surface. Simply CNC machining the sandwich core according to the design surface cannot guarantee an exact match sandwich core consistent with the panels. The actual topography of the panels must be scanned. It is proposed that the use of a new hand-held laser scanner, Handyscan to scan large thin-walled curved surface parts, of Geomagic software to handle the acquired point clouds and construct the surface model.

Superplastic Forming Formula for Aluminum Channel Panels

2005 ◽  
Author(s):  
Frank G. Lee ◽  
M. David Hanna
Keyword(s):  
Finite Element ◽  
Aspect Ratio ◽  
Superplastic Forming ◽  
Forming Process ◽  
Taguchi Design Of Experiment ◽  
Forming Parameters ◽  
Physical Experiments ◽  
Element Simulation ◽  
Experiment Method ◽  
Sectional Analysis

A parametric study was conducted to determine how the design features and forming parameters affect part thinning and forming time in the Superplastic Forming Process (SPF). Explicit formulas, describing the maximum percent thinning and the forming time for channel parts formed by the SPF process as a function of eight designs and forming parameters, were derived. The formulas are good approximations of those obtained by finite element simulation analyses and physical experiments. Thinning of the channels was influenced most by the component aspect ratio (height versus width) and entry radius at top of the channel forming tool. The forming time was most influenced by strain rate, aspect ratio and tool bottom radius. A design domain can be established to avoid excessive thinning. The Taguchi design-of-experiment method was applied to select parameter combinations, and the MARC finite element code was used to conduct sectional analysis for various combinations.

A Study on Gas Pressure for Superplastic Forming of Titanium Alloy Bellows

2005 ◽  
Vol 475-479 ◽  
pp. 3051-3054 ◽  
Author(s):  
Gang Wang ◽  
Jun Chen ◽  
X.Y. Ruan
Keyword(s):  
Titanium Alloy ◽  
Thin Shell ◽  
Deformation Theory ◽  
Shell Theory ◽  
Superplastic Forming ◽  
Gas Pressure ◽  
Forming Process ◽  
Compressive Axial Load ◽  
Thin Shell Theory ◽  
Gas Pressures

The complex superplastic forming (SPF) technology applying gas pressure and compressive axial load is an advanced forming method for bellows made of titanium alloy, which forming process consists of the three main forming phases namely bulging, clamping and calibrating phase. The influence of forming gas pressure in various phases on the forming process are analyzed and models of forming gas pressure for bellows made of titanium alloy are derived according to the thin shell theory and plasticity deformation theory. Using model values, taking a two-convolution DN250 bellows made of Ti-6Al-4V titanium alloy as an example, a series of superplastic forming tests are performed to evaluate the influence of the variation of forming gas pressure on the forming process. According to the experimental results models are corrected to make the forming gas pressures prediction more accurate.

New Strategy for the Prediction of the Gas Pressure Profile of Superplastic Forming of Al-5083 Aluminium Alloy

2012 ◽  
Vol 735 ◽  
pp. 204-209 ◽  
Author(s):  
Nagore Otegi ◽  
Lander Galdos ◽  
Iñaki Hurtado ◽  
Sean B. Leen
Keyword(s):  
Strain Rate ◽  
Constant Strain Rate ◽  
Superplastic Forming ◽  
Pressure Profile ◽  
Bulge Test ◽  
Forming Process ◽  
Optimum Pressure ◽  
New Approach ◽  
Superplastic Alloy ◽  
New Strategy

This paper describes a new approach for identification of the optimum pressure history for SPF processes, based on mechanisms-based hyperbolic constitutive equations. This equation set has been modified to incorporate the effect of the damage behaviour the material suffers due to the cavitational evolution of Al-5083 superplastic alloy. A large deformation, multiaxial formulation of the constitutive equation set is implemented and applied to finite element modelling of a bulge test forming process to characterise the cavitation evolution behaviour in the bulge test, using conventional (constant strain rate) and the newly proposed (variable strain rate) strategy.

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