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Although a number of investigations of the bearing strength of aluminum alloys have been made, the problem remains one of considerable interest to the aircraft industry. For this reason it has seemed advisable to make additional tests of the commonly used aircraft alloys in an effort to establish a better basis for the selection of allowable bearing values. Current design practice does not recognize the effect of edge distance upon bearing strengths, and for this reason edge distance upon bearing strengths, and for this reason edge distance was one of the principal variables considered in this investigation. The increasing emphasis being placed upon permanent set limitations makes it essential that more information on bearing yield phenomena be obtained.
Results are presented in this paper of bearing tests made to determine bearing ultimate and yield strengths of aluminum-alloy permanent-mold castings of B195-T4, B195-T6, and 356-T6, and to compare the ratios of bearing to tensile properties obtained with similar data from sand-castings of like materials.
A detailed method is presented for determining temperature and flow minimums of heated gas necessary for ice prevention of hollow propellers with evaluation of surface temperatures, gas pressures, tip nozzle areas, flow passages, and heat source input.
This is the sixth of a series of report covering an investigation of the general instability problem by the California Institute of Technology. This report summarizes the work that has been carried on in the experimental investigation of the problem of general instability of stiffened metal cylinders subjected to combined bending and transverse shear.
The forms in which magnesium alloys may be encountered are castings, extrusions, forgings, and sheet. The alloys commonly used in aircraft structures in the various forms and the effects of the aging treatment are discussed under separate headings below.