Constant point of load application fracture specimen loading machine
US4198870A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1978 |
| Grant date | Apr 22, 1980 |
| Priority date | — |
| Expiry date | Nov 9, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2203/0066
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A constant point of load application fracture specimen loading machine for applying a load between grips that engage opposite grip groove faces of a slotted specimen that preferably has as a remainder portion in that slot a "V" shaped slot root whereby, when the machine grips are moved apart, they rotate so as to apply a constant point of load application to pull the specimen apart at that slot root. The machine of the present invention is useful for measuring the fracture toughness, fatigue-crack growth resistance, or stress corrosion crack growth resistance of slotted specimens providing a unique force application system whereby sliding friction losses are minimized, and other introduced effects, such as from specimen grip machining tolerances, or the like, are largely automatically compensated for.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.