scholarly journals FORMING LIMIT DIAGRAM FOR THIN SHEET METAL AT METAL FORMING BY MOVABLE MEDIA

2015 ◽  
Vol 219 (2) ◽  
pp. 159-166
Author(s):  
X. S. Arsentyeva ◽  
S. N. Kunkin ◽  
A.M. Alexander ◽  
V.S. Mamutov
Keyword(s):  
Sheet Metal ◽  
Metal Forming ◽  
Thin Sheet ◽  
Forming Limit Diagram ◽  
Forming Limit ◽  
Thin Sheet Metal

Size effects in thin sheet metal forming and its elastic–plastic constitutive model

2007 ◽  
Vol 28 (5) ◽  
pp. 1731-1736 ◽  
Author(s):  
Linfa Peng ◽  
Fang Liu ◽  
Jun Ni ◽  
Xinmin Lai
Keyword(s):  
Constitutive Model ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Size Effects ◽  
Metal Forming ◽  
Thin Sheet ◽  
Elastic Plastic ◽  
Thin Sheet Metal

APPLICATION OF FORMING LIMIT CRITERIA BASED ON PLASTIC INSTABILITY CONDITION TO METAL FORMING PROCESS

2008 ◽  
Vol 22 (31n32) ◽  
pp. 5680-5685
Author(s):  
SEONG-CHAN HEO ◽  
TAE-WAN KU ◽  
JEONG KIM ◽  
BEOM-SOO KANG ◽  
WOO-JIN SONG
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Thin Sheet ◽  
Plastic Instability ◽  
Theoretical Background ◽  
Forming Limit ◽  
Preliminary Evaluation ◽  
Forming Process ◽  
Element Analysis

Metal forming processes such as hydroforming and sheet metal forming using tubular material and thin sheet metal have been widely used in lots of industrial fields for manufacturing of various parts that could be equipped with mechanical products. However, it is not easy to design sequential processes properly because there are various design variables that affect formability of the parts. Therefore preliminary evaluation of formability for the given process should be carried out to minimize time consumption and development cost. With the advances in finite element analysis technique over the decades, the formability evaluation using numerical simulation has been conducted in view of strain distribution and final shape. In this paper, the application of forming limit criteria is carried out for the tube hydroforming and sheet metal forming processes using theoretical background based on plastic instability conditions. Consequently, it is confirmed that the local necking and diffuse necking criteria of sheet are suitable for formability evaluation of both hydroforming and sheet metal forming processes.

A New Approach to the Evaluation of Forming Limits in Sheet Metal Forming

2015 ◽  
Vol 639 ◽  
pp. 333-338 ◽  
Author(s):  
Marion Merklein ◽  
Andreas Maier ◽  
Daniel Kinnstätter ◽  
Christian Jaremenko ◽  
Emanuela Affronti
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Forming Limit Diagram ◽  
Forming Limit ◽  
Strain History ◽  
Failure Behavior ◽  
Forming Limits ◽  
Optical Strain Measurement ◽  
Optical Strain

The forming limit diagram (FLD) is at the moment the most important method for the prediction of failure within sheet metal forming operations. Key idea is the detection of the onset of necking in dependency of different sample geometry. Whereas the standardized evaluation methods provides very robust and reliable results for conventional materials like deep drawing steels, the determined forming limits for modern light materials are often too conservative due to the different failure behavior. Therefore, within this contribution a new and innovative approach for the identification of the onset of necking will be presented. By using a pattern recognition-based approach in combination with an optical strain measurement system the complete strain history during the test can be evaluated. The principal procedure as well as the first promising results are presented and discussed.

An Aid to Practical Sheet Metal Forming

1970 ◽  
Vol 12 (6) ◽  
pp. 443-445
Author(s):  
R. Pearce ◽  
J. Woodthorpe
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Forming Limit Diagram ◽  
Forming Limit ◽  
Analytical Technique

Until recently, no analytical technique was available for the study of failure in complex sheet metal pressing. However, if the maximum ( e1) and minimum ( e2) principal surface strains at failure on sheet metal pressing are measured, a plot of e1 against e2 results in a so-called forming limit diagram. FLD can be constructed in the laboratory and used as an aid to die try-out, production failures and metal specification.

Numerical Prediction of Forming Limit in Hemispherical Punch Bulging by Lemaitre's Ductile Damage Model

2011 ◽  
Vol 110-116 ◽  
pp. 1437-1441 ◽  
Author(s):  
Farhad Haji Aboutalebi ◽  
Mehdi Nasresfahani
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Damage Mechanics ◽  
Thin Sheet ◽  
Damage Model ◽  
Ductile Damage ◽  
Forming Limit ◽  
St14 Steel ◽  
Hemispherical Punch

Prediction of sheet metal forming limits or analysis of forming failures is a very sensitive problem for design engineers of sheet forming industries. In this paper, first, damage behaviour of St14 steel (DIN 1623) is studied in order to be used in complex forming conditions with the goal of reducing the number of costly trials. Mechanical properties and Lemaitre's ductile damage parameters of the material are determined by using standard tensile and Vickers micro-hardness tests. A fully coupled elastic-plastic-damage model is developed and implemented into an explicit code. Using this model, damage propagation and crack initiation, and ductile fracture behaviour of hemispherical punch bulging process are predicted. The model can quickly predict both deformation and damage behaviour of the part because of using plane stress algorithm, which is valid for thin sheet metals. Experiments are also carried out to validate the results. Comparison of the numerical and experimental results shows good adaptation. Hence, it is concluded that finite element analysis in conjunction with continuum damage mechanics can be used as a reliable tool to predict ductile damage and forming limit in sheet metal forming processes.

Enhancing the Mechanical Properties and Formability of Cold Rolled Closed Annealed Sheet for Automobile Applications

2019 ◽  
Vol 11 (4) ◽  
Author(s):  
S.P. Sundar Singh Sivam ◽  
L. Ganesh Babu ◽  
D. Kumaran
Keyword(s):  
Sheet Metal ◽  
Metal Forming ◽  
Forming Limit Diagram ◽  
High Strength ◽  
Forming Limit ◽  
Low Carbon ◽  
Resistance Alloy ◽  
Cold Rolled ◽  
Annealed Sheet ◽  
Metallic Sheet

Designers of high pace advanced vehicles in aerospace industries particularly vehicle manufacturing types are placing more needs at the sheet metal forming enterprise by designing components from the high strength thermal resistance alloy. The principle goal of the observation is to test the mechanical, formability parameters and Erichsen cupping values of a sample of cold rolled closed annealed sheet. The quantity of strain that a metallic sheet can tolerate just before localized failure is called limit strain. The boundaries of formability in sheet metal operations are defined regarding the primary traces via the forming limit diagram (FLD). To be useful for engineering purposes, FLD needs to be simple enough so its parameters can be evaluated without difficulty ideally by way of uniaxial tests. The consequences confirmed that the formability of steel having decreased percentage of carbon is forming lesser. It changed into pressure distribution and the grain density of the sheet verifies the formability. The best grouping of strength and ductile properties are noted for metal with the low carbon and higher forming assets.

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