 English
English
Documentation
> > Validation Case: Bimetallic Strip Under Thermal Load

# Validation Case: Bimetallic Strip Under Thermal Load

The FEA model bimetallic strip under thermal load. Bimetallic strips are subject to bending due to heat – and can be used to convert change in temperature to mechanical displacement.

The resulting comparison of the simulation results against the analytical calculations validates the use of following conditions for thermomechanical static analysis in Solve:

• Thermomechanical Solver
• Restraints

## Geometry: Geometry Dimensions

• Part 1: 20cm x 0.3cm x 0.1cm
• Part 2: 20cm x 0.3cm x 0.1cm

## Material:

These materials are taken directly from the OnScale library of materials.

Part 1:

• Iron
• Young’s Modulus (Ea) = 200 GPa
• Density (ρb) = 7870 kg/m³
• Thermal Expansion (γb) = 2e-5 1/K
• Specific Heat (Cpb) = 480 J/(kgK)
• Thermal Conductivity (κb)= 60 W/(mK)

Part 2:

• Cast Iron
• Young’s Modulus (Eb) = 200 GPa
• Density (ρb) = 7870 kg/m³
• Thermal Expansion (γb) = 1e-5 1/K
• Specific Heat (Cpb) = 480 J/(kgK)
• Thermal Conductivity (κb)= 60 W/(mK)

Note: All other material properties can be left as their default values.

## Physics:

Mechanical Physics:

• Restraints (Fixture) – Part 1 • Restraints (Slider Z) – Part 1 • Restraints (Restraint Y) – Part 2 Thermal Physics:

• Temperature – 100°C ## Meshing:

OnScale Solve automatically generates a 3D second-order tetrahedral mesh. The meshing statistics are:

Mesh Quality: Very Fine

## Analytical Solution:

The values for dx and dz are taken from the center middle of the max X extent. The contact point between the top and bottom plate.

dx: The equations were taken from Roark’s Formulas for Stress and Strain, Eighth Edition ## Results:

 Output Variables Analytical Method Onscale Solve dx (m) 30um 30um dz (m) 1.5mm 1.497mm σxx (MPa) 50MPa 50MPa

## References:

 (2011)”Roark’s Formulas For Stress And Strain, Eighth Edition”, W. C. Young, R. G. Budynas, A. M. Sadegh