Patent · US Active

Detection method of crack occurrence position

US8559018B2 · kind B2 · utility

1Cited by

4References

2Claims

0Family size

Assignees

THE UNIVERSITY OF TOKYO · JP
KAWASAKI JUKOGYO KABUSHIKI KAISHA · JP

Inventors

Nobuo Takeda · Sendai, JP
Yasuo Hirose · Kakamigahara, JP

Key dates

Filing date	Aug 25, 2008
Grant date	Oct 15, 2013
Priority date	—
Expiry date	Sep 25, 2029

Classification

Technology area (CPC G)Physics
CPC primaryG01M11/083
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A surface layer formed of a composite material is stacked on the surface of a core layer formed of a foam synthetic resin material, and an arrester portion is provided in an interface region between the surface layer and the core layer to prevent the progression of delamination between the surface layer and the core layer. Optical fibers with grating portions are embedded inside the arrester and along the surface layer, and the spectra of reflected light from the optical fibers are compared to detect the occurrence position of a crack between the surface layer and the core layer.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.