Methods, systems, and test articles for determining a flexibility value of a fastener
US9534994B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Aug 5, 2013 |
| Grant date | Jan 3, 2017 |
| Priority date | — |
| Expiry date | Nov 5, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2203/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Methods, systems, and apparatuses for determining a flexibility value K of a fastener. An illustrative system includes a test apparatus including three straps with a strain gauge coupled to each strap. A fastener, such as a bolt, is installed through the straps, with a tensile or compressive force then applied to the test apparatus. Responsively, the strain gauges generate signals indicative of elastic deformation of the straps. The signals are transmitted to a signal processor, which may display deformation values, or alternatively, may process the signals to calculate the value K. The elastic deformation values acquired from the strain gauges, together with cross sectional area and elastic moduli of the straps, are entered into a calculation which applies a predetermined relationship to arrive at the value K. The test apparatus may be a stand-alone device for use in calculating the value K.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.