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US 8,479,589 B2Granted
Method and apparatus for characterizing microscale formability of thin sheet materials
AssigneeUniversity of Kentucky Research Foundation
InventorsNasr A. Shuaib, Marwan K. Khraisheh
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Abstract
A method of predicting sheet formability at a microscale level includes the steps of providing a grid pattern on a test sheet, bulging the test sheet to a hemispherical shape until a crack is initiated on the surface of the test sheet, detecting the initiation of the crack, acquiring two images of the surface adjacent to the crack and calculating surface strains on the test sheet.
Claims20
A method of predicting sheet formability at a microscale level, comprising:
- printing a grid pattern on a surface of a test sheet;
- bulging said test sheet to a hemispherical shape until a crack is initiated on said surface of said test sheet and said grid pattern printed on said surface of said test sheet is deformed;
- detecting the initiation of said crack;
- acquiring two images of said deformed grid pattern on said surface adjacent said crack;
- and
- calculating surface strains on said test sheet from said deformed grid pattern.
3 more elements
A punch-die microforming apparatus, comprising:
- a frame;
- a test specimen having a surface printed with a grid pattern;
- a die for holding said test specimen on said frame;
- a linear actuator carried by said frame;
- a punch carried by said linear actuator;
- a plurality of kinematic supports carried on said frame;
- a plurality of hemispheres provided on said die, said plurality of hemispheres supporting said die on said plurality of kinematic supports.
4 more elements
Dependencies are inferred from the claim text.