CTE: coefficient of thermal expansion - Secant Method - Ansys
CTE: coefficient of thermal expansion - Secant Method - Ansys
(OP)
Hello,
I have to perform a thermo-mechanical simulation in Ansys WB and I have to provide the cte of a material.
I have few experience with thermo-mechanical simulation.
I have got a document with the material properties of this material; there I have the Tg (glass transition temperature)
and two coefficients: cte1 (below Tg) and cte2 (above Tg).
--> How should I calculate the CTE for a temperature range (e.g. -50 < Tg < 300) ? <---
Usually I have measurements with DeltaL/L0 for different temperature T and I use the secant method:
cte = [(L-Lref)/Lref]/(T-Tref) and I take Tref = 25 C (room temperature).
If I only have 2 values (below and above Tg), how can I calculate the CTE?
And what is the correct Tref?
Can I say, cte = cte1 (for T < Tg) and cte = cte2 (for T >= Tg)
or is it possible to get some temperature dependent curve using the secant method?
Do you also have some good support literature about this problem?
many thanks!
I have to perform a thermo-mechanical simulation in Ansys WB and I have to provide the cte of a material.
I have few experience with thermo-mechanical simulation.
I have got a document with the material properties of this material; there I have the Tg (glass transition temperature)
and two coefficients: cte1 (below Tg) and cte2 (above Tg).
--> How should I calculate the CTE for a temperature range (e.g. -50 < Tg < 300) ? <---
Usually I have measurements with DeltaL/L0 for different temperature T and I use the secant method:
cte = [(L-Lref)/Lref]/(T-Tref) and I take Tref = 25 C (room temperature).
If I only have 2 values (below and above Tg), how can I calculate the CTE?
And what is the correct Tref?
Can I say, cte = cte1 (for T < Tg) and cte = cte2 (for T >= Tg)
or is it possible to get some temperature dependent curve using the secant method?
Do you also have some good support literature about this problem?
many thanks!





RE: CTE: coefficient of thermal expansion - Secant Method - Ansys
RE: CTE: coefficient of thermal expansion - Secant Method - Ansys
My problem is that in Ansys, I must provide the cte using the secant method.
If I just use the 2 CTEs, I have a large discontinuity, I think it is like the tangent method.
If I enter the values cte = cte1 (for T < Tg) and cte = cte2 (for T >= Tg),
what should be my reference temperature, Tg or room temperature?
Is it possible make cte = cte1 (constant for T < Tg) and get a nonlinear curve for T >= Tg ?
thanks!