Effect of Material Parameters Wave on Sheet Metal Springback Using Orthogonal Design Simulation

2011 ◽  
Vol 314-316 ◽  
pp. 585-588 ◽  
Author(s):  
Lei Chen
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Orthogonal Design ◽  
Direct Analysis ◽  
Element Model ◽  
Internal Stresses ◽  
Common Phenomenon ◽  
Material Parameters ◽  
Simulation Results

Springback is a common phenomenon in sheet metal forming, caused by the elastic redistribution of the internal stresses during unloading. The aim of this search is to investigate the wave of material parameters on the results of forming and springback of sheet metal. A finite element model of cylinder bending benchmark of NUMISHEET’2002 was proposed firstly to simulate bending and springback with contact evolution between tools and blank based on static implicit method. The simulation results agree well with the experiment. Then the effects of the wave of material parameters on forming and springback results are investigated using orthogonal design simulation. Eight factors are investigated with the orthogonal label. The results show the factors have different effects on both the forming and springback. And the significance of the factors is shown through direct analysis of the results.

A Contribution to the Optimisation of a Simple Shear Test

2009 ◽  
Vol 410-411 ◽  
pp. 467-472 ◽  
Author(s):  
Marion Merklein ◽  
M. Biasutti
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Shear Test ◽  
The Finite Element Method ◽  
Simple Shear Test ◽  
Material Parameters

The finite element method is a widely used tool in sheet metal forming. The quality of the results of such an analysis depends largely on the applied constitutive model and its material parameters, which have to be determined experimentally. These data are relevant on the choice of the yield criterion among the wide range of options available in the commercial applications implementing the finite element method. Since the accuracy of material parameters estimation is therefore crucial, investigations were performed with an Al-Mg sheet alloy and a mild steel sheet to optimize a Miyauchi-based simple shear test. This method is one of the basic ways to investigate the plastic properties of a sheet metal up to large strains, which is very important for numerical analysis of sheet metal forming processes. Aim of the test is to determine the shear stress-strain correlation. In order to enhance the quality of the experimental results the detection of the deformation’s field, trough an optical measurement system, and the methodology for its evaluation are focus of the present study.

Sheet Metal Forming Using Polymer Composite Rapid Prototype Tooling

2003 ◽  
Vol 125 (3) ◽  
pp. 247-255 ◽  
Author(s):  
Y. Park ◽  
J. S. Colton
Keyword(s):  
Sheet Metal ◽  
Polymer Composite ◽  
Tool Life ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Low Cost ◽  
Rapid Prototype ◽  
Element Model ◽  
Bending Process ◽  
Composite Tooling

To meet the growing demand for rapid, low-cost die fabrication technology in the sheet metal forming industry, easy-to-machine, polyurethane-based, composite board stock is widely used as a rapid tooling material. However, the failure mechanisms of the rapid prototyped tools are not clearly understood, thus making the prediction of tool life difficult. As a fundamental step for effective tool life estimation, the microstructure and the mechanical properties of the polymer composite tooling material were characterized. A finite element model of 90° V-die bending process was developed, and the effects of process parameters on stress distribution in punch and die were investigated through simulation. The simulation results were verified through experiments using instrumented, laboratory-scale punch and die sets.

Die Life Prediction in Rapid Prototype Dies

2002 ◽  
Author(s):  
Young-Bin Park ◽  
Jonathan S. Colton
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Low Cost ◽  
Rapid Prototype ◽  
Element Model ◽  
Fatigue Properties ◽  
Fabrication Technology ◽  
Die Life ◽  
Bending Process

To meet the growing demand for rapid, low-cost die fabrication technology in the sheet metal forming industry, easy-to-machine, polyurethane-based, composite board stock is used widely as a rapid tooling material. In practice, it is desirable to terminate die life by wear rather than by catastrophic fatigue. However, the failure mechanisms of the rapid prototyped tools are not clearly understood, thus making the prediction of tool life difficult. This paper presents a method to estimate the fatigue life of a sheet metal forming die fabricated from ATH (aluminum trihydrate)-filled polyurethane. A finite element model of 90° V-die bending process was developed, and the effects of process parameters on stress distribution in the punch and die were investigated through simulation. Mechanical testing was performed to characterize the fatigue properties of the tooling material. The computer-simulated results were verified through experiments using instrumented, laboratory-scale punch and die sets.

A Rapid Inverse Method of Material Performance Parameters in Sheet Metal Forming

2012 ◽  
Vol 538-541 ◽  
pp. 1035-1040
Author(s):  
Hua Liu ◽  
Kai Yong Jiang ◽  
Bin Liu ◽  
Ping Lu
Keyword(s):  
Genetic Algorithm ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Inverse Method ◽  
Orthogonal Experiment ◽  
The Self ◽  
Performance Parameters ◽  
Sensitive Material ◽  
Material Parameters

This paper proposes a fast and convenient method to inverse the material performance parameters in stamping forming. This method effectively combined with the FEM and the genetic algorithm. The reverse objective function was constructed with the thickness which is easily measured from the stamped parts, and then a genetic algorithm was programmed; The thickness-sensitive material performance parameters can be acquired through the orthogonal experiment, then these material parameters can be inversed by the self-programming genetic algorithm. Finally, a stamping case proves this method is precise, rapid and valid.

Rate-Dependent Material Parameters of the Combined Isotropic/Kinematic Hardening Model for the TRIP980 Steel Sheet

2016 ◽  
Vol 725 ◽  
pp. 132-137
Author(s):  
Geun Su Joo ◽  
Hoon Huh
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Steel Sheet ◽  
Kinematic Hardening ◽  
Strain Rates ◽  
Rate Condition ◽  
Hardening Model ◽  
Material Parameters ◽  
Rate Dependent

This paper is concerned with rate-dependent hardening behaviors of the TRIP980 steel sheet. In sheet metal forming, sheet metals experiences complicated loading at various strain rates. In order to predict deformed shape in sheet metal forming, accurate material properties and an appropriate constitutive model in numerical simulation are important to consider reverse loading and various strain rates simultaneously.This paper deals with rate-dependent material parameters of the isotropic/kinematic hardening model. Tension/compression tests of the TRIP980 steel sheet are performed with a newly developed experimental technique at various strain rates ranging from 0.001 to 100 s−1. Tension/compression hardening curves of the TRIP980 steel sheet are approximated by the Chun et al model at each strain rate condition respectively. From acquired material parameters, rate dependencies of tension/compression hardening behaviors are investigated.

Research on the Forming Process of the Y-Shaped Tube Based on ABAQUS

2012 ◽  
Vol 602-604 ◽  
pp. 1942-1945
Author(s):  
Ling Yun Zhang ◽  
Ya Lin Pan ◽  
Zhen Jun Li
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Stress And Strain ◽  
Forming Process ◽  
Shaped Tube ◽  
Deformation Ability ◽  
Simulation Results ◽  
Distribution Of Stress ◽  
Abaqus Software

ABAQUS software is used to simulate the stamping process of the Y-shaped tube to study the feasibility of stamping forming. The simulation results are analyzed to study how fabrication holes affect the ability of sheet metal forming. The results show that it is possible to form the Y-shaped tube by stamping; fabrication holes with reasonable size and location can improve the distribution of stress and strain, and enhance the limit deformation ability of the sheet.

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