OS-V: 0750 Radial Stretching of a Cylinder
Illustrates the use of asymmetrical elements (CTAXI) under uniform radial displacement in OptiStruct.
Model Files
Benchmark Model

Figure 1. Cylinder Subjected to Uniform Radial Displacement
The inner and outer radii of the cylinder are 4.0 and 6.0 respectively. A mesh of 20*20 elements is used to model the axisymmetric model with first and second order CTAXI elements. The cylinder base is constrained in the axial direction, inner edge is constrained in the radial direction and a radial displacement is enforced using SPCD along the outer edge of the cylinder.
- Property
- Value
- Young's Modulus
- 2 x 1011 Pa
- Poisson's Ratio
- 0.3
- Density
- 1,000 kg
Results

Figure 2. Plot of Radial Stress versus Radial Distance for CTAXI Element

Figure 3. Plot of Hoop Stress versus Radial Distance for CTAXI Element
Below radius 5m, the results of 2nd order CTAXI elements are an excellent match with analytical solution, and above 5m, the results of 1st order CTAXI elements are a better match to analytical solution.