As we know, the spring constant changes with =
temperature for
the typical materials used for springs. For instance, for carbon steel, =
the modulus
of elasticity is 29.5E6 psi at 70 degrees F and then changes to 28.8E6 =
psi at
200 degrees F. This means that the spring constant changes with =
temperature. Is
this a problem that I should be concerned about. My vertical seismometer =
is
located in the wine cellar and so the temperature does not vary during =
the day,
but the temperature may change 10 degrees F with the seasons. Does =
anyone use a
spring made with Ni-Span-C 902? This material is extremely stable with
temperature. The modulus of elasticity is 27.79E6 psi at 0, 100, and 200
degrees F. The only problem is that this material is not used very much =
and it’s
a made to order situation. Peck Springs in Connecticut ( 860-747-5715) =
has made
springs with material from time to time. They are checking to see what =
the cost
would be.
Any thoughts?
Gary
Gary Lindgren
585 Lincoln Ave
Palo Alto CA 94301
650-326-0655<=
/span>
www.blue-eagle-technologies.com &nbs=
p;
Check out Lastest Seismometer =
Reading
cymonsplace.blogspot.com