Active stress specimen using an electromagnet and belleville washer
US5417116A · kind A · utility
5Cited by
20References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 17, 1993 |
| Grant date | May 23, 1995 |
| Priority date | — |
| Expiry date | Nov 17, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2203/027
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus and method for inducing and measuring crack growth in a solid by using a double cantilever beam assembly which includes a fracture specimen with a notch that defines a pair of spaced outwardly extending beams terminating at an end where growth of a crack occurs, and a spring assembly for continuously urging the spaced beams apart with a substantially constant pressure that creates a spreading pressure at the end where crack growth occurs to stress the fracture specimen at the end. An electromagnet assembly is used to cyclically apply and remove the spreading pressure caused by the spring assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.