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Aviation History
1938
1938 - 0619.PDF
MAKCH 3, 1938. ADVERTISEMENTS. FLIGHT. HIGVTOUTYAUOYS SCIENTIFIC CONTROL NO. 5 STRESS-STRAIN DIAGRAM FOR HiDUMiN'.uH R.R.77 ELASTIC LIMIT 25.2 i« per »q m O.l\ PROOF STRESS 30.S ., ULTIMATE STRESS 36.8 ELONGATION PER CENT 15.0 GAUGE LENGTH .-..-• 2 INCHES DIAMETER OF TEST PIECE • 0.564 INCHES AREA OF CROSS SECTION 025"SCINCHES' I TENSILE TESTING Tensile tests, giving figures for strength, proof stress, elongation, etc., of materials, play a wry important part in all metal- 'ufgical research and control. By means of such tests carried out on test pieces from every alloy melt and each part or batch of parts manufactured, a careful check on mechanical strength is kept.
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