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AssigneeDatron AG
InventorsRichard D. Angley, Michael S. Ciesielski, Christopher T. Dial, Peter T. Mahal, Robert F. Cook
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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 predetermined depth of penetration. Resulting compressive gradient strength data is representative of performance of cellular concrete sections in decelerating an aircraft.
Arresting material test apparatus, to test compressive gradient strength on a continuous basis from the surface to an internal depth of penetration within compressible arresting material, comprising:
An arresting material test probe, suitable to test compressive gradient strength continuously from the surface to an internal depth of penetration within compressible arresting material, comprising:
A method for continuous compressive testing of a cellular concrete section suitable for arresting motion of an object, comprising the steps of:
A method for determining compressive gradient strength over a depth of penetration of a test section, comprising the steps of:
A method for determining compressive gradient strength over a depth of penetration of a test section of compressible material, comprising the steps of:
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