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
RBE2
The linear material properties are:
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.