nikhilmohan
Aerospace
- Jun 4, 2015
- 1
Hi everyone,
I have to do thermal-mechanical coupling analysis of a cantilever beam where several steps are present.
STEPS:
1. HEATING ( from 25 deg C to 130 deg C)
2. LOADING (1.3 MPa)
3. COOLING (before cooling i am holding the free edge of the cantilever and cooling down the temperature to 25degC)
4. UNLOADING (before removing load i am unholding one edge and same magnitude load is applied in opposite direction)
5. HEATING (holding both the edge and i am heating again to 130degC)
I have done the analysis till the second step. But in third step i am encountering a problem. In COOLING step i suppose to change the reference temperature to 130degC from 25degC. But in HEATING step reference temperature should be 25degC.
I am unable to find out a way to change the material values in different steps. Can anyone help me?
I have attached .cae file here.
Note: I am using temp dependent young's modulus and expansion coefficient with ref.temp=130degC.
Problem : stress value is shooting up to 97 MPa in cooling step. But analytically the value should be around 8.6 MPa.
I have to do thermal-mechanical coupling analysis of a cantilever beam where several steps are present.
STEPS:
1. HEATING ( from 25 deg C to 130 deg C)
2. LOADING (1.3 MPa)
3. COOLING (before cooling i am holding the free edge of the cantilever and cooling down the temperature to 25degC)
4. UNLOADING (before removing load i am unholding one edge and same magnitude load is applied in opposite direction)
5. HEATING (holding both the edge and i am heating again to 130degC)
I have done the analysis till the second step. But in third step i am encountering a problem. In COOLING step i suppose to change the reference temperature to 130degC from 25degC. But in HEATING step reference temperature should be 25degC.
I am unable to find out a way to change the material values in different steps. Can anyone help me?
I have attached .cae file here.
Note: I am using temp dependent young's modulus and expansion coefficient with ref.temp=130degC.
Problem : stress value is shooting up to 97 MPa in cooling step. But analytically the value should be around 8.6 MPa.