Method for measuring fiber orientation degree, fiber orientation degree measurement apparatus, and control computer program for fiber orientation degree measurement apparatus
US11360035B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 2, 2018 |
| Grant date | Jun 14, 2022 |
| Priority date | — |
| Expiry date | Feb 27, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2223/306
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for measuring a fiber orientation degree includes: irradiating a sample formed of a composite material containing discontinuous carbon fibers with an X-ray to acquire an X-ray diffraction image; calculating an angle (2θ)A of a peak originating from a crystal face of graphite; calculating a correction coefficient δ of a thickness of the sample; calculating an upper limit (2θ)B of the peak of the crystal face of graphite; calculating a diffraction sensitivity IC(ϕ) of the peak originating from the crystal face of graphite by correcting an integrating range with the correction coefficient δ and integrating the X-ray diffraction image with respect to a diffraction angle (2θ); and calculating a fiber orientation degree Sd(β) by the method of Hermans from the diffraction sensitivity IC(ϕ).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.