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|Title:||Evaluation of Goodyear medium-duty aluminum honeycomb landing mat|
|Authors:||United States. Army Materiel Command.|
Carr, Gordon L.
|Keywords:||Aluminum landing mats|
Goodyear aluminum mats
Honeycomb landing mats
|Publisher:||Soils and Pavements Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
Abstract: This report describes an investigation to evaluate a medium-duty aluminum honeycomb-core landing mat designed and fabricated by Goodyear Aerospace Corporation, Akron, Ohio, as a result of the Government request for proposal dated 6 May 1968. The medium-duty mat was a sandwich-type structure with a honeycomb core bonded by an epoxy film adhesive to aluminum top and bottom skins. Extruded aluminum edge connectors were also bonded with a similar adhesive to the top and bottom skins and to the core. Individual panels were joined along two edges with a hinge-type connection and along the adjacent two edges by overlap-/underlap-type connections that were locked together by insertion of a connector bar. The panel dimensions, weight, and placing rate were 4 ft by 4 ft by 1.5 in., 67.5 lb, and 478 square feet per man-hour, respectively. The weight per square foot of placing area was 4.1 lb. Traffic and skid tests were conducted to obtain information for evaluating the service life and performance of the medium-duty mat as specified by project requirements. Laboratory tests were performed to determine the mechanical properties of the mat panels and their component parts, and results indicated that the materials in the mat met the specified requirements. The traffic tests were conducted with a rolling wheel load, simulating aircraft operations on mat placed on a prepared subgrade. The tests were conducted using a single-wheel load of 25,000 lb with a tire-inflation pressure of 250 psi on a mat-surfaced subgrade with a rated CBR of 3.8. The Goodyear medium-duty mat sustained 622 coverages of traffic under the above-stated conditions, which is equivalent to 890 coverages on a 4.0-CBR subgrade; thus, the mat failed to meet current requirements of 1000 coverages on a 4.0-CBR subgrade. The medium-duty mat sustained almost twice as many coverages as a previously tested Goodyear all-bonded mat. Failure of individual panels resulted from a gradual depression of the surface of the panels caused by failure of the adhesive between the core and skins and by overstressing of the adhesive between the edge connectors and skins. The coefficients of friction obtained from dry and wet skid tests were 0.57 and 0.45, respectively. NOTE: This file is large. Allow your browser several minutes to download the file.
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