Method for determining plane strain fracture toughness of non-elastic fracture mechanics specimens
US4299120A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 19, 1979 |
| Grant date | Nov 10, 1981 |
| Priority date | — |
| Expiry date | Mar 19, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2203/027
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention involves a new method for measuring plane strain fracture toughness (K.sub.Ic) of a somewhat non-elastic material uniquely suitable for use on specimens that are smaller than have formerly been required for performing valid K.sub.Ic tests. The present invention involves selecting a short-rod specimen configuration in which the specimen material at a crack front or tip therein would be constrained during loading to a plane strain state and, from the measurement and anelastic analysis of a load-displacement curve that includes at least two unloading slopes the energy per unit crack area that is required to slowly advance a steady state crack can be determined, which data, along with measurement of the critical load when the crack passes through a known location, and considering the specimen geometry, is used to determine the fracture toughness, K.sub.Ic, of the specimen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.