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Re: Thermal props of high tensile bolts

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Dave Meney
Your message came through twice; the first time with something called the
"Happy99 Worm" (?) virus attached.  I think I caught in time.  Please check
your own files.

Thor Tandy  P.Eng  MCSCE
Victoria BC

-----Original Message-----
From: Dave Meney <yenem(--nospam--at)>
To: seaint(--nospam--at) <seaint(--nospam--at)>
Date: Thursday, February 11, 1999 2:36 PM
Subject: Thermal props of high tensile bolts


Does anyone know whether the thermal coefficient of expansion for a high
tensile bolt (UTS=1050 MPa, yield stress = 945 MPa) is any different to that
for mild steel?

I have a problem where an argument has been raised regarding the loss of
pre-tension in a torqued screw, where the screw is high tensile and the
components are mild steel.  The claim is that after heating the assembly to
130°C (266°F) for a couple of hours, the thermal differences in the two
steels causes significant loss of prestress.

Any comments?

Dave Meney
Structural Engineer

Yenem Engineering Services
54 John Street