Home / Examples / Stress Analysis [Galileo] / Example 20: Two Plates Adhered at One End (Simple Contact #2)

Example 20: Two Plates Adhered at One End (Simple Contact #2)

General

The model consists of two adjoining plates and a joint part for them and the plate and the joint part have different coefficients of linear thermal expansion.
The simple contact boundary is set on the inner faces of the plates.
The bar is subjected to the thermal load of the temperature variation, and will deform.
The deformation, the displacement distribution, and the stress distribution are solved.
Unless specified in the list below, the default conditions will be applied.

Results will vary depending on Femtet version and the PC environment.

Analysis Space

Item	Settings
Analysis Space	3D
Model Unit	mm

Analysis Conditions

The temperature is applied evenly on the model.

Opt for the thermal load in the analysis condition, and set the reference temperature and the reached temperature.

There is no need to couple with the thermal analysis [Watt].

Item	Settings
Solver	Stress Analysis [Galileo]
Analysis Type	Static Analysis
Options	Select Thermal load

The Step/Thermal Load tab is set as follows.

Analysis is performed with the reached temperature of 0 deg.

Tab	Setting Item	Settings
Step/Thermal Load	Reference temperature	25 [deg]
Step/Thermal Load	Step/Reached Temperature Setting	Step 1: 0 [deg]

Model

Two plates, PLATE1 and PLATE2, have the same coefficient of linear thermal expansion,
while the joint part, EDGE, has two times as large coefficient as the plate.

Body Attributes and Materials

Body Number/Type	Body Attribute Name	Material Name
0/Solid	TERMINAL	MAT2
1/Solid	PLATE1	MAT1
2/Solid	PLATE2	MAT1

The material properties are set up as follows:

MAT2 has very different coefficient of linear thermal expansion from MAT1.

Material Name	Tab	Properties
MAT1	Elasticity	Young's Modulus: 10×109 [Pa] Poisson's Ratio: 0.3
MAT1	Coefficient of Linear Thermal Expansion	5×10-6 [1/deg]
MAT2	Elasticity	Young's Modulus: 10×109 [Pa] Poisson's Ratio: 0.3
MAT2	Coefficient of Linear Thermal Expansion	10×10-6 [1/deg]

Boundary Conditions

Boundary Condition Name/Topology	Tab	Boundary Condition Type	Settings
CONTACT/Face	Mechanical	Simple Contact	Simple Contact Classification : Automatic Judgment

Results

The contour diagram shows the Z displacement.

At lower temperatures, the joint material shrinks more than the plates. As a result, the other ends of the plates open.

The vectors of stress around EDGE are shown below.

EDGE is getting the tensile stress, whereas the plates are getting the compressive stress.