Abstract
In this paper, the influence of the residual compressive stresses induced by roller burnishing on fatigue crack propagation in the fillet of notched round bar is investigated. A 3D finite element simulation model of rolling has allowed to introduce a residual stress profile as an initial condition. After the rolling process, fatigue loading has been applied to three-point bending specimens in which an initial crack has been introduced. A numerical predictive method of crack propagation in roller burnished specimens has also been implemented. It is based on a step-by-step process of stress intensity factor calculations by elastic finite element analyses. These stress intensity factor results are combined with the Paris law to estimate the fatigue crack growth rate. In the case of roller burnished specimens, a numerical modification concerning experimental crack closure has to be considered. This method is applied to three specimens: without roller burnishing, and with two levels of roller burnishing (type A and type B). In all these cases, the computational finite element predictions of fatigue crack growth rate agree well with the experimental measurements. The developed model can be easily extended to crankshafts in real operating conditions.
| Original language | English |
|---|---|
| Pages (from-to) | 231-242 |
| Number of pages | 12 |
| Journal | Fatigue and Fracture of Engineering Materials and Structures |
| Volume | 30 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 1 Mar 2007 |
| Externally published | Yes |
Keywords
- Crack propagation
- Elastic fracture mechanics
- Fatigue
- Finite element analysis
- Notched round bar
- Residual stress
- Roller burnishing