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Title: Evaluation of XM20 production landing mat
Authors: Naval Air Engineering Center (U.S.)
Burns, Cecil D.
Grau, Robert W. (Robert Walter)
Keywords: Landing mats
Traffic tests
XM20 landing mat
Publisher: U.S. Army Engineer Waterways Experiment Station.
Engineer Research and Development Center (U.S.)
Description: Miscellaneous Paper
Abstract: This investigation was conducted to evaluate the performance of a production quantity of XM20 landing mat that was extruded by Dow Chemical Company, Madison Division, Madison, Ill., and fabricated by Washington Aluminum Company, Enterprise, Ala. The mat, fabricated from 2- by 12-ft extrusions, was similar to AM2 mat except for the method used to attach the end connectors to the main extrusion and a slight change of the cross section of the main extrusion. A test section consisting of one clay sub grade item at a strength of 4 CBR was constructed and surfaced with the XM20 mat. The test section was subjected to uniform-coverage traffic representing operations of an aircraft having a 60,000-lb gross weight with a single-wheel main-gear assembly load of 27,000 lb with a 30x7.7 tire inflated to 400 psi. Based on the results obtained in this study, it is concluded that: (A.) The XM20 mat will sustain 1600 cycles (188 coverages) of aircraft operations with a 27,000-lb single-wheel load and 400-psi tire inflation pressure when placed on a subgrade having a CBR of 2.8 or greater throughout the period of traffic, or about 685 coverages of the same loading when placed on a subgrade having a CBR of 4 or greater throughout the period of traffic. This mat meets the criteria established by NAEC for landing mats considered for use in SATS. (B.) The double thickness of the ribs provided by the inserts at the end joints of the planks has virtually eliminated end-joint weld failures. (C.) For practical purposes, there was no significant difference in the performance of the XM20 production mat and that of the experimental mat. NOTE: This file is large. Allow your browser several minutes to download the file.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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