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Help > Solve > OnScale Solve Validation Cases > Validation Case: Multi-Material Bar in Compression

Validation Case: Multi-Material Bar in Compression

This article is part of the series of FEA validation cases performed using OnScale Solve.

In this case, a bar assembly with 4 parts is fixed at one end and a pressure load is applied at the opposite end.

The FEA model and the resulting comparison of the simulation results against the analytical calculations validates the use of following conditions for linear elastic static analysis in Solve:

  • Pressure load
  • Restraint conditions
  • von Mises stress calculation

Geometry

Download the geometry here or use Onshape to access the geometry used for this analysis:

  • Geometry Dimensions
    • Part Cross Sectional Area = 2 mm by 2 mm
    • Part 1 Length (L1) = 3 mm
    • Part 2 Length (L2) = 10 mm
    • Part 3 Length (L3) = 5 mm
    • Part 4 Length (L4) = 2 mm

Material

  • Custom Material for Part 1
    • Young’s Modulus (E) = 193 GPa
    • Poisson’s Ratio (ν) = 0.0
  • Custom Material for Part 2
    • Young’s Modulus (E) = 71 GPa
    • Poisson’s Ratio (ν) = 0.0
  • Custom Material for Part 3
    • Young’s Modulus (E) = 200 GPa
    • Poisson’s Ratio (ν) = 0.0
  • Custom Material for Part 4
    • Young’s Modulus (E) = 110 GPa
  • Poisson’s Ratio (ν) = 0.0

Physics

  • Restraints
    • Fixture 1 (Fixed XYZ degrees of freedom)
    • Part 4, Face 4
  • Pressure Load
    • Pressure: 1 MPa
    • Part 1, Face 5

Meshing

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

Mesh Quality: Medium
Elements: 266
Vertices: 122

Reference Solution

With Poisson’s Ratio equal to zero, the stress is uniaxial.

For this uniaxial case, the maximum equivalent stress in all parts will be equal to the applied pressure.

Results Comparison

The table below compares the values obtained using the analytical methods described above and the FEA analysis performed using OnScale Solve.

Outputs Analystical Method OnScale Solve
von Mises Stress 1 GPa 1 GPa