Method and apparatus for non-destructive testing of composite materials
US4494408A · kind A · utility
19Cited by
8References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 27, 1982 |
| Grant date | Jan 22, 1985 |
| Priority date | — |
| Expiry date | Jul 27, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/0251
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Methods and apparatus are disclosed for monitoring and controlling potential residual stress relief mechanisms in composite epoxy resin materials. Passive and injected, or active, acoustic signals originating in or propagated through a specimen material during the formation process produce signatures identifiable with known residual stress relief mechanisms. Real-time control of material temperature and external pressure during formation in response to acoustic signals measured or observed in relation to desired acoustic signature minimizes formation of undesired material properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.