A NOVEL METHODOLOGY TO DETERMINATION OF FORMING LIMIT CURVE IN TWO- LAYER METALLIC SHEETS BASED ON NUMERICAL MODELS

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KARAJIBANI EHSAN; HASHEMI RAMIN; SEDIGHI MOHAMMAD

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Seminar Paper

Paper Information

Seminar: CONFERENCE OF IRANIAN AEROSPACE SOCIETY
Year:2015 | Issue:14

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Title

A NOVEL METHODOLOGY TO DETERMINATION OF FORMING LIMIT CURVE IN TWO- LAYER METALLIC SHEETS BASED ON NUMERICAL MODELS

Author(s)

KARAJIBANI EHSAN | HASHEMI RAMIN | SEDIGHI MOHAMMAD

Keywords

FORMING LIMIT CURVE

TWO-LAYER METALLIC SHEET

FEM

CRITERION

Abstract

FORMING LIMIT CURVE (FLC) IS A SUITABLE METHOD TO DETERMINE THE FORMABILITY OF METALLIC SHEETS IN SHEET METAL FORMING OPERATIONS. THE AIM OF THIS RESEARCH IS TO PRESENT A SIMULATION-BASED APPROACH FOR PREDICTION OF THE FORMING LIMIT CURVE IN TWO-LAYER METALLIC SHEETS. IN THIS PAPER, THE FORMABILITY OF TWO-LAYER (AL3004- ST12) METALLIC SHEETS, WITH ALUMINUM INNER LAYER WHICH WAS IN CONTACT WITH THE PUNCH AND STEEL OUTER LAYER WHICH WAS IN CONTACT WITH THE DIE WERE NUMERICALLY INVESTIGATED. TWO DIFFERENT CRITERIA, INCLUDING THE ACCELERATION (I.E. THE SECOND TIME DERIVATIVES) OF THICKNESS AND MAJOR STRAIN EXTRACTED FROM THE STRAIN HISTORY INFORMATION OF FE SOFTWARE, WERE APPLIED TO ACCURATELY DETERMINE THE START OF LOCALIZED NECKING IN FORMING LIMIT CURVES. THIS IS TO SAY THAT THE LOCALIZED NECKING WILL BE STARTED WHEN THE ACCELERATION OF THE THICKNESS OR MAJOR STRAIN GETS ITS MAXIMUM VALUE. THE PUBLISHED EXPERIMENTAL INFORMATION FOR AL/ST TWO-LAYER METALLIC SHEETS HAD BEEN USED TO EVALUATE THE SIMULATION RESULTS. IT WAS SHOWN THAT THE PRESENTED METHODS WERE IN GOOD AGREEMENT WITH THE EXPERIMENTALLY OBSERVED DATA. USING THE PRESENTED METHODS, THE INFLUENCES OF SOME PROCESS PARAMETERS ON THE FLC WERE INVESTIGATED. IT WAS SHOWN THAT PROCESS PARAMETERS SUCH AS, THICKNESS OF EACH LAYER, FRICTION COEFFICIENT BETWEEN BLANK AND PUNCH, FRICTION COEFFICIENT BETWEEN BLANK AND DIE/BLANK HOLDER AND LAY-UP HAD SIGNIFICANT INFLUENCE ON THE FLC OF TWO-LAYER METALLIC SHEETS. THE RESULTS ILLUSTRATED THAT THE FLC IS DEPENDENT ON MENTIONED PARAMETERS, SO THE TWO-LAYER METALLIC SHEET FORMABILITY CAN BE INCREASED BY IMPROVEMENT OF THESE FACTORS IN FORMING LIMIT TESTS.

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APA: Copy

KARAJIBANI, EHSAN, HASHEMI, RAMIN, & SEDIGHI, MOHAMMAD. (2015). A NOVEL METHODOLOGY TO DETERMINATION OF FORMING LIMIT CURVE IN TWO- LAYER METALLIC SHEETS BASED ON NUMERICAL MODELS. CONFERENCE OF IRANIAN AEROSPACE SOCIETY. SID. https://sid.ir/paper/945617/en

Vancouver: Copy

KARAJIBANI EHSAN, HASHEMI RAMIN, SEDIGHI MOHAMMAD. A NOVEL METHODOLOGY TO DETERMINATION OF FORMING LIMIT CURVE IN TWO- LAYER METALLIC SHEETS BASED ON NUMERICAL MODELS. 2015. Available from: https://sid.ir/paper/945617/en

IEEE: Copy

EHSAN KARAJIBANI, RAMIN HASHEMI, and MOHAMMAD SEDIGHI, “A NOVEL METHODOLOGY TO DETERMINATION OF FORMING LIMIT CURVE IN TWO- LAYER METALLIC SHEETS BASED ON NUMERICAL MODELS,” presented at the CONFERENCE OF IRANIAN AEROSPACE SOCIETY. 2015, [Online]. Available: https://sid.ir/paper/945617/en

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