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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).
Analysis of stress tests on a link, comparing twisting and bending forces as the cause of fractures.

Identifier  ExFiles\Box 78\2\  scan0070
Date  7th June 1912 guessed
  
-4-

In observing these tests I
noticed that although the method of
making the two tests is widely different,
yet the resulting stress in the link
is very similar in the two cases.

In the first case (twisting test) each
arm of the link is bent as a cantilever
in opposite directions and each link
is also twisted about its own axis.

In the second case (bending test) each
arm of the link is bent as a cantilever
in the same direction but not twisted
on its own axis.

I do not think the arms of
the link would ever break from the
above mentioned twisting component alone,
and I think these fractures show that
it is the bending which takes place
owing to either a seized bush or the
rolling of the car acting on the link
when it is not quite vertical, but this
  
  


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