Shifting a forming limit curve based on zero friction analysis
AssigneeMagna International Inc.
InventorsThomas James Oetjens, Thomas Lorne Chartrand, Alexander Paul Oetjens
Life of this patent
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Abstract
A method for improving a hemispherical dome test includes calculating a forming limit diagram (FLD) based on a plurality of simulated data associated with a sheet metal transformation technique. The method also includes performing zero friction analysis on the sheet metal transformation technique. The method also includes shifting the FLD based on the zero friction analysis.
Claims20
A method for shifting a forming analysis based on zero friction analysis, comprising:
- calculating a first alpha stress value from a ratio of a minor stress and a major stress from a predefined property of a hemispheric dome test of a die, the die being employed to deform sheet metal used to perform the hemispheric dome test;
- determining a forming limit diagram (FLD) based on the major stress and the minor stress;
- generating a second alpha stress value of a zero friction analysis of an upper fiber;
- determining an alpha stress value ratio based on the first alpha stress value and the second alpha stress value;
- generating a beta value of a zero friction analysis of a middle fiber;
- generating a corrected zero friction test using the alpha stress value ratio and the beta value;
- determining an updated FLD based on the major stress, the minor stress, and the corrected zero friction test;
- and
- using the updated FLD to deform sheet metal using the die.
A system for shifting a forming analysis based on zero friction analysis, comprising:
- a data store comprising a computer readable medium storing a program of instructions for the shifting of a forming analysis;
- a processor that executes the program of instructions, the instructions comprising the following operations:
- calculating a first alpha stress value from a ratio of a minor stress and a major stress from a predefined property of a hemispheric dome test of a die, the die being employed to deform sheet metal used to perform the hemispheric dome test;
- determining a forming limit diagram (FLD) based on the major stress and the minor stress;
- generating a second alpha stress value of a zero friction analysis of an upper fiber;
- determining an alpha stress value ratio based on the first alpha stress value and the second alpha stress value;
- generating a beta value of a zero friction analysis of a middle fiber;
- generating a corrected zero friction test using the alpha stress value ratio and the beta value;
- determining an updated FLD based on the major stress, the minor stress, and the corrected zero friction test;
- and
- using the updated FLD to deform sheet metal using the die.
A system for shifting a forming analysis based on zero friction analysis, comprising:
- a processor;
- and
- a memory that includes instructions that, when executed by the processor, cause the processor to:
- calculate a first alpha stress value from a ratio of a minor stress and a major stress from a predefined property of a hemispheric dome test of a die, the die being employed to deform sheet metal used to perform the hemispheric dome test;
- determine a forming limit diagram (FLD) based on the major stress and the minor stress;
- generate a second alpha stress value of a zero friction analysis of an upper fiber;
- determine an alpha stress value ratio based on the first alpha stress value and the second alpha stress value;
- generate a beta value of a zero friction analysis of a middle fiber;
- generate a corrected zero friction test using the alpha stress value ratio and the beta value;
- determine an updated FLD based on the major stress, the minor stress, and the corrected zero friction test;
- and
- use the updated FLD to deform sheet metal using the die.
Dependencies are inferred from the claim text.