Method for controlling stress distribution in material and reading stress information
US10685200B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 4, 2018 |
| Grant date | Jun 16, 2020 |
| Priority date | — |
| Expiry date | Nov 8, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D15/01
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The invention relates to a method for controlling the stress distribution in a material, comprising the steps of: a, preparing a crosslinked polymer containing reversible exchange bonds; b, applying an external force to the crosslinked polymer to cause a certain strain; c, specific region of the crosslinked polymer is selectively heated while maintaining the strain. This method controls and utilizes the internal stresses which are commonly considered as unfavorable. The invention also provides a method for reading information in a polarized light field, wherein the crosslinked polymer treated by the method is transparent under natural light. The information therein can be read only under polarized light, and possesses concealment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.