Nondestructive determination of phase fractions of composite materials
US5170367A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 25, 1990 |
| Grant date | Dec 8, 1992 |
| Priority date | — |
| Expiry date | Apr 25, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/02854
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The fractions of the phases of a composite material are determined utilizing a calibration relationship between at least one nondestructively measured quantity and a destructively measured phase fraction. The proper calibration relationship is selected from a multiple-variable regression relation, a single-variable regression of a product of two measured quantities, one of two single-variable regressions, or a weighted average of the results of two single-variable regressions, all four approaches utilizing nondestructive measurements of specimen consolidated height and specimen consolidated ultrasonic transit time. When prepreg material having uniaxial fibers is analyzed, multiple-layer specimens are formed by stacking the individual plies so that the fiber directions in adjacent layers are not parallel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.