Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1997-02-07
1998-08-04
Dougherty, Elizabeth L.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
73 82, G01N 300
Patent
active
057896810
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 predetermined depth of penetration. Resulting compressive gradient strength data is representative of performance of cellular concrete sections in decelerating an aircraft.
REFERENCES:
patent: 3498114 (1970-03-01), Garber et al.
patent: 3566668 (1971-03-01), Browning et al.
patent: 3732725 (1973-05-01), Allen, Jr. et al.
patent: 3867159 (1975-02-01), Ergene
patent: 3894426 (1975-07-01), Kpof
patent: 4182191 (1980-01-01), Ikdea
patent: 4640120 (1987-02-01), Garritano et al.
patent: 4649735 (1987-03-01), Pihlaja
patent: 5048320 (1991-09-01), Mitsuhashi et al.
patent: 5193764 (1993-03-01), Larratt
patent: 5241993 (1993-09-01), Stevens
patent: 5419632 (1995-05-01), Stevens
patent: 5616857 (1997-04-01), Merck, Jr. et al.
ACI Committee 523, "Guide for Cast-in-Place Low Density Concrete", ACI Journal, Sep. 1967.
Standard Test Method for Compressive Strength of Lightweight Insulating Concrete, (C495-86), American Society for Testing and Materials, Dec. 1986.
Cook, Robert F., Evaluation of a Foam Arrestor Bed for Aircraft Safety Overrun Areas,(UDR-TR-88-07), University of Dayton Research Institute, Jan. 1988.
McMichael, Steve and Fisher, Steve, "Understanding Materials with Instrumented Impact", Mechanical Engineering, Apr. 1989.
Balaguru, P. and Ramakrishnan, Seetharamen, Properties of Lightweight Cement Composite Containing Ceramic Spheres, (Civil Engineering Report No. 92-11), The State University of New Jersey, Rutgers, Nov. 1992.
"Quality Assurance of Batch Mixed Cellular Concrete", Cellufoam Concrete Systems, Dec. 1994.
Preliminary Soft Ground Arrestor Design for JFK International Airport, (Draft of Final Report DOT/FAA/CT-95), Mar. 1995.
Brochure: "Structural and Nonstructural Mearlcrete Cellular Concrete Applications and Properties", The Mearl Corporation, Dec. 1987.
Brochure: "E-SORB Hollow Sphere Composites for Energy Absorption", Microcel Technology, Inc., date unknown.
Brochure: "Geotechnical Grouting Applications Using Low Density Cellular Concrete", Pacific International Grout Co., date unknown.
Brochure: "Light-Weight Foam Technology", Zementschaum-Technik International GmbH, date unknown.
Angley Richard D.
Ciesielski Michael S.
Cook Robert F.
Dial Christopher T.
Mahal Peter T.
Datron Inc.
Dougherty Elizabeth L.
Robinson Kenneth P.
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