Modified ring test
US4821577A · kind A · utility
3Cited by
5References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 22, 1987 |
| Grant date | Apr 18, 1989 |
| Priority date | — |
| Expiry date | Jun 22, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2203/0274
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A novel test specimen configuration and modified ring test method for determining the fracture toughness, K.sub.Ic, using rock core is disclosed. The use of a truncated hollow cylindrical specimen under compressive load avoids the development of a large process zone (microcracked region) during testing, thus allowing accurate fracture toughness measurements on subsized specimens. Results using soft sandstones and Indiana limestone validate the procedure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.