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Title: Evaluation of XM20 landing mat under medium-duty load
Authors: United States. Army Materiel Command.
Gerard, Charles J.
Keywords: Landing mats
Traffic tests
XM20 landing mat
Publisher: U.S. Army Engineer Waterways Experiment Station.
Engineer Research and Development Center (U.S.)
Series/Report no.: Miscellaneous Paper (U.S. Army Engineer Waterways Experiment Station) ; S-69-28
Description: Miscellaneous Paper
Abstract: This report describes an investigation conducted to evaluate an aluminum alloy landing mat (designated XM20) manufactured by the Dow Chemical Company, Madison, Ill., and, for purposes of comparison, an extruded two-piece aluminum alloy production mat (designated AM2). The XM20 mat is a one-piece hollow extrusion fabricated from 6061 aluminum alloy artificially aged to the T6 condition. The XM20 mat is similar in design to MX18-B mat; however, the internal ribs and the female connector are thickened to add to the design strength of the mat. Both the XM20 and AM2 mats are interlocked along the sides by means of a hinge-type connector, the components of which are an integral part of the basic panel extrusion. End connectors are composed of extruded connectors welded to . the basic panel and consist of an overlap and underlap section secured by a locking bar after individual panels have been joined together. This investigation consisted of traffic tests to obtain information on the XM20 experimental mat and to compare the performance of the XM20 mat with that of the AM2 production mat. Laboratory tests were conducted to provide data on the structural properties of the XM20 mats and their component parts. The mat was traffic tested with a rolling wheel load to complete the evaluation of the design and fabrication. The traffic tests were conducted on a prepared subgrade with a rolling wheel load that simulated actual aircraft operations. These tests were conducted with a 25,000-lb single-wheel load with a tire inflation pressure of 250 psi on a mat-surfaced subgrade with initial average CBR's of 3.6 and 3.5 for the XM20 and AM2, respectively. Tests indicated that when placed on a subgrade with a rated CBR of 4, the XM20 would sustain more than 5000 coverages of traffic; the production mat (AM2) would sustain 620 coverages of traffic. It is recommended that further engineer traffic tests be conducted to evaluate the XM20 mat for the revised Qualitative Materiel Requirement for heavy-duty mat. NOTE: This file is very large. Allow your browser several minutes to download the file.
Gov't Doc #: Miscellaneous Paper S-69-28
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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