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Subject: Re: STRUC: T-dep CTEs
Author: Martin Vezina
Date: 2001-07-10 12:35:00Hello Eric,
If you apply one load step (TREF to T), you just have to input the secant
CTE value between those two temperatures. But with more than one load step,
you need to use T-dep CTE's if you want a better simulation of your bimetal.
Also, in this case, the strain free temperature TREF corresponds to the flat
temperature of the bimetal. Let say you have a nonlinear
displacement/temperature curve from a TMA test, your analysis involves three
load steps (0, 25, 50) and your flat temperature is 100. Your input from
your curve will be:
Temp CTE
100 tangent
50 secant between 100-50
25 secant between 100-25
0 secant between 100-0
If you want to change your reference temperature, the MPAMOD will change all
your inputs accordingly.
In fact, we can loosely say that the thermal strain calculations are path
independent : they are calculated for each load steps without considering
the previous load step(s).
Hope it helps.
Martin Vézina
Mechanical designer
R&D
CORVIS CANADA
mvezina@c...
www.corvis.com
-----Message d'origine-----
De : egan@n... [mailto:egan@n...]
Envoyé : 10 juillet, 2001 12:07
À : xansys
Objet : RE: [xansys] STRUC: T-dep CTE's
Sorry...this was my first request....
The details are:
Eric Egan, PhD Candidate
National Microelectronics Research Centre (NMRC)
National University of Ireland
Lee Maltings, Prospect Row
Cork, Ireland
Email: egan@n..., eric.egan@m...
Phone: +353 21 4904063
Fax: +353 21 4270271