Extraction Testing of Wood-Screw-Secured Tiedowns

摘要

An engineering test exploring the feasibility of using 5,000-pound-capacity floor tiedowns for securing U. S. Army aircraft in commercial and military van containers was conducted. The tiedowns were secured alternately to four species of wood (representing types of wood used in container floors) by wood screws, and the screws extracted from the wood at angles of 90 degrees and 45 degrees by a universal testing machine. A working load of 30 percent of the failure load was applied to the tiedown system and held for 1/2 hour, with no yield observed. The results of the laboratory tests showed the tiedown system to be structurally adequate under static loads. (Author)