Method of using isotropic plasticity to model the forming of anisotropic sheet
US6731996B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 19, 1999 |
| Grant date | May 4, 2004 |
| Priority date | — |
| Expiry date | Oct 19, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2113/24
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of fabricating an article from a blank of material (e.g., aluminum alloy sheet) having anisotropic deformation properties, with tooling which has been designed by predicting flow and deformation of the blank using an analysis which decouples the anisotropic deformation properties of the blank. The method calculates the response of a small amount of the blank using crystal plasticity theory. The blank can be represented as a mesh having a plurality of elements. A strain path is predicted for each element using finite element analysis (FEA), and a stress-strain curve is defined for each element by performing a material point simulator (MPS) calculation for each element using its respective strain path. A second FEA is then carried out on the elements using the respective stress-strain curve for each element. The stress-strain curve for each element may be defined by assigning to each element a curve which lies between an upper bound curve and a lower bound curve, using various methods. The computational model requires much less CPU time compared to prior art methods.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.