Test specimen design incorporating multiple fracture sites and multiple strain state material fractures
US6405600B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1997 |
| Grant date | Jun 18, 2002 |
| Priority date | — |
| Expiry date | Apr 28, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2203/0494
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A material test specimen design is taught for the determination of critical strain and stress states for multiaxial fracture. The objective of the specimen is to increase the amount of data obtained per specimen while retaining simplicity in testing procedure by using standard tension testing machines to generate the primary deformation of the specimen. The specimen, in conjunction with analytical or computational simulation, uses nonuniform deformation fields produced by secondary and tertiary strain concentrations to generate and track these multiaxial strain states to fracture. Typically, the primary deformation is uniaxial tension of a panel, the secondary strain concentration is a circular hole in the panel and the tertiary strain concentrations are areas of reduced thickness within the deformation field of the circular hole. Multiaxial strain ratios from −0.50 to −0.10 and control over fracture initiation sites may be generated by a test specimen design of the type taught by this invention.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.