National Advisory Committee for Aeronautics (NACA) - 82 Matching Results

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Summary of results of tests made by aluminum research laboratories of spot-welded joints and structural elements

Description: Available information concerning spot welding as a means of joining aluminum-alloy parts has been summarized and comparisons have been made of the relative merits of spot-welded and riveted aluminum-alloy structural elements. The results indicated that spot welding was as satisfactory as riveting insofar as resistance to static loads is concerned. Spot welds showed slightly lower resistance to impact loads but definitely lower resistance to repeated loads than rivets.
Date: November 1, 1942
Creator: HARTMANN E C & Stickley, G W
Partner: UNT Libraries Government Documents Department

Some investigations of the general instability of stiffened metal cylinders VII : stiffened metal cylinders subjected to combined bending and torsion

Description: This report summarizes the work that has been carried on in the experimental investigation of the problem of the general instability of stiffened metal cylinders subjected to combined bending and torsion at the C.I.T. This part of the investigation included tests on 26 sheet-covered specimens. An interaction curve for the case of combined bending and torsion is presented. The results of tests of 17 specimens subjected to pure torsion are also given.
Date: November 1, 1943
Partner: UNT Libraries Government Documents Department

Relief of residual stress in streamline tie rods by heat treatment

Description: About two-thirds of the residual stress in cold-worked SAE 1050 steel tie rods was relieved by heating 30 minutes at 600 degrees Fahrenheit. Cold-worked austenitic stainless-steel tie rods could be heated at temperatures up to 1000 degrees Fahrenheit without lowering the important physical properties. The corrosion resistance, in laboratory corrosion test, of straight 18:8 and titanium-treated 18:8 materials appeared to be impaired after heating at temperatures above 800 degrees or 900 degrees fahrenheit. Columbium-treated and molybdenum-treated 18:8 steel exhibited improved stability over a wide range of temperatures. Tie rods of either material could be heated 30 minutes with safety at any temperature up to 1000 degrees Fahrenheit. At this temperature most of the residual stress would be relieved.
Date: November 1, 1941
Creator: Pollard, R E & Reinhart, Fred M
Partner: UNT Libraries Government Documents Department

The synthesis and purification of aromatic hydrocarbons IV : 1,2,3-trimethylbenzene

Description: A six gallon quantity of 1,2,3-trimethylbenezene was prepared and purified in a four-step synthesis involving the condensation of 1,3-pentadiene with crotonaldehyde. The dimethylcyclohexencarboxaldehydes formed were hydrogenated to give the corresponding isomeric dimethylcyclohexylcarbinols. The dehydration of the carbinols and the subsequent dehydrogenation of the trimethylcyclohexenes yielded the 1,2,3-trimethylbenzene. The overall yield was 24 percent; the physical properties of the materials are given.
Date: November 1, 1946
Creator: Lamberti, J. M.; Reynolds, T. W. & Chanan, H. H.
Partner: UNT Libraries Government Documents Department

The synthesis and purification of aromatic hydrocarbons V : 1-ethyl-3-methylbenzene

Description: The method used for the synthesis and purification of an 8-gallon quantity of 1-ethyl-3-methylbenzene from m-creosol consists in obtaining m-methylcyclohexanone from m-creosol by hydrogenation followed by oxidation, condensation of the ketone with ethylmagnesium bromide, dehydration of the tertiary alcohol obtained, and the dehydration of the olefins to 1-ethyl-3-methylbenzene. A yield of 28 percent of the theoretical was obtained from 98 percent commercial m-creosol. The physical properties of the 1-ethyl-3-methylbenzene are compared with selected values from the literature.
Date: November 1, 1946
Creator: Ebersole, Earl R
Partner: UNT Libraries Government Documents Department