IT has been generally accepted for some time that the mechanical properties of light alloys varied with the direction of grain, but even in the design of aircraft structures only a slight allowance has been made for this variation. The importance of this grain direction on the strength of light alloys was first realized as a result of the abnormally low test strength of one lug made from a 6½″ dia. DTD.683 extruded bar.
McElhinney, D. (1951), "The Effect of Grain Direction on Mechanical Properties of Light Alloy Extrusions: A Report on a Series of Tests Carried Out by Vickers‐Armstrongs at Weybridge", Aircraft Engineering and Aerospace Technology, Vol. 23 No. 3, pp. 62-66. https://doi.org/10.1108/eb032006Download as .RIS
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