OS-E: 0900 Seam Weld Fatigue Analysis and Size Optimization of a Frame Structure
Demonstrates Seam weld fatigue optimization using OptiStruct.
Figure 1. FE Model
Model Files
Before you begin, copy the file(s) used in this example to
your working directory.
Model Description
The objective is to minimize the mass of the structure using size optimization, by using
fatigue life and mass as response (Figure 1).
- FE Model
- Elements Types
- CQUAD
The linear material properties are:
Figure 2. Size Optimization Plot and Fatigue Life Plot
- MAT1
- Young’s Modulus
- 2.1E5 MPa
- Poisson Ratio
- 0.3
- Density
- 7.9E-9
Figure 2. Size Optimization Plot and Fatigue Life Plot
Results
The final design of the fatigue analysis and size optimization of the frame has 23% mass saving.
The Fatigue life improved from 22634 cycles to 504017 cycles at element 303718 and the minimum fatigue life was improved to 250415 cycles.