in UCTM

Example 3

Веселин Илиев

Thermal Stresses in АNSYS Workbench 10.0

This material is designed for reminding of the subject, studied in the course. The explanation of the some simple operations is skipped here, so the material is not appropriate for unaided use. Even precise implementation of the instructions can cause results, different from described here. For additional information write to veso@uctm.edu

• Analysis – linear, steady-state conductivity, thermal stresses

• Geometry – medium complexity

• Materials – Copper Alloy and Structural Steel from the Ansys Workbench Library

• Load – thermal, steady-state

Description

Copper Alloy pipe is supported

by steel bolted bracket. The

temperature of the one end of the

pipe is raised from 25оС to 120оС.

The temperature of the other end is

permanently 25оС.

The geometrical model of the

pipe can be downloaded from

The aim is to determine the stress and strain in the nut

bolt, caused by thermal expansion of the pipe.

http://www.uctm.edu/~veso/ansys_u/Primeri/termo1.agdb

by clicking here.

- Geometrical model importing

- The pipe material changing

All parts of the model are defined as Structural Steel from program library. The pipe material will be

changed in Copper Alloy here.

Clicking around wile the part desired changes color.

Switching over “Import Material”

Choose the material (Copper Alloy) from the list.

- Defining of the contact surface conductivity

As the solution is steady state, if the surface conductivity at contact between the pipe and the bracket

exists, the uniform thermal expansion in the assembly is formed. In this case there isn’t thermal stresses.

In this example is expected the surface conductivity to be interrupted by applying extremely small

value (1е-10) of the contact thermal conductance.

Switching over manual control of the thermal conductance value.

Clicking around wile the contact surface desired changes color.

- Examination of the mesh

- Applying of the load (120оС at the left end of the pipe)

1

2

3

45

6

- Applying of the load (25оС at the right end of the

pipe)1

2

3

4

5

- Defying of the results expected for the assembly 2

3

4

5

6

7

1

- Defying of the results expected for the nut bolt

When the results are displayed, the characteristics (minimum value, maximum value, color contours) refer to value in assembly. To specify the results for particular element, this must be announced in advance.

2

3

4

1

6

5

78

- Complete of the calculation

- RESULTS

Temperature distribution in the assembly

- RESULTS

Strain distribution in the assemblyFor better view the deformed shape is overstated

If it is necessary, the strains can be displayed

in the real size.

- RESULTS

Stress distribution in the assembly

- RESULTS

Stress distribution in the nut

- RESULTS

Stress distribution in the bolt