Rolls-Royce Archives
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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Chart of fatigue limits for valve spring wire, plotting final stress against initial stress.

Identifier  ExFiles\Box 17\6\  Scan218
Date  9th May 1934 guessed
  
FATIGUE LIMITS FOR VALVE SPRINGWIRE.
FINAL STRESS "#/□"
CHART #2
KEUFFEL & ESSER CO. N.Y.
CHROME VANADIUM
10%
CARBON STEEL
10%
SAFE STRESS RANGE
45°
VALUES TAKEN FROM CHART #1
INITIAL STRESS "#/□"
  
  


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