When the bricks were not truly rectangular in section, the strength of the hollow walls was found to be less than that expected from the net area. Construction data are given which show the relative saving in materials and time for the hollow types. The results of the wallette tests confirm, in general, the conclusions deduced from the wall tests.
Dynamic-Ioad-stretch and stretch-energy data were obtained for two types of nylon and one type of cotton parachute webbing. These data were compared wit h similar data obtained from static tenRile tests of the materials. The dynamic and static breaking strengths of the web bing were also obtained. The nylon specimens showed a reduced strength, stretch, and capacity for energy absorption under dynamic loading as compared with static loading. The cotton specimens showed under dynamic loading about the same strength, reduced stretch, and increased energy absorption. The energy absorbed by the broken nylon specimens was more t han three times that of the broken cotton specimens.
Values of Poisson's ratio, as well as ordinary stress-strain properties, for tensile strains as high as 18 percent, were determined on sheets of aluminum alloys 24ST and 24SRT, chrome-molybdenum steel plate, and structural and fully killed low-carbon steel plate.
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