Arresting material test apparatus and methods
US5789681A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 1997 |
| Grant date | Aug 4, 1998 |
| Priority date | — |
| Expiry date | Feb 7, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N11/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Arresting material test apparatus, test probes and test methods enable testing of compressive gradient strength of cellular concrete, and materials having similar characteristics, on a continuous basis from the surface of a section to a typical internal penetration depth of at least 60 percent of thickness. Previous testing of cellular concrete typically focused on testing to confirm a minimum structural strength prior to structural failure or shattering of a test sample. For an aircraft arresting bed, for example, cellular concrete must exhibit a compressive gradient strength in a relatively narrow precalculated range continuously from the surface to penetration depth equal to 60 to 80 percent of sample thickness. Precalculated and controlled compressive gradient strength is critical to enabling an aircraft to be safely stopped within a set distance, without giving rise to drag forces exceeding main landing gear structural limits. New test apparatus, test probes with post-compression build-up relief and test methods are described to enable such testing and recordation of data showing the gradient of compressive strength as it increases from the surface of a test sample to a predet…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.