Fatigue modeling of additively manufactured titanium

Purpose and goal:

The project developed a multiaxial fatigue model, which is suitable for fatigue analysis of non-proportionally loaded structures made of additively manufactured titanium. The model was validated with experimental testing and was shown to capture the effects of different load types, geometric notches, as well as surface roughness and defect size.

Expected results and effects:

Prediction of the influence of complex geometry, stress history, surface roughness, and presence of defects is critical for fatigue life assessment of additively manufactured structures. The model developed in the project is a tool that enables this and that can be used effectively for the design of additively manufactured structures.

The project results benefit the industry through the necessary knowledge and tools that enable the introduction of methods for additive manufacturing of load-bearing structures, while the theory development benefits future university research. Approach and implementation:

The project was performed during one year as a cooperation between the aircraft industry (SAAB and Amexci AB) and the universities (LiU and Mid Sweden University).