About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
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Additive Manufacturing of Titanium-based Materials: Processing, Microstructure and Material Properties
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Presentation Title |
Stress State Dependent Fracture Behavior of Additively Manufactured Ti-6Al-4V Containing Internal Flaws |
Author(s) |
Alexander E. Wilson-Heid, Erik T. Furton, Allison M. Beese |
On-Site Speaker (Planned) |
Erik T. Furton |
Abstract Scope |
The effect of internal flaws within Ti-6Al-4V fabricated by laser powder bed fusion additive manufacturing will be presented. To probe the effects of both stress state and flaw size, samples of different geometries were fabricated with penny-shaped flaws with a range of diameters (up to 16% of the cross-sectional area of the gauge region). The evolution of stress and strain state up to fracture were determined through corresponding finite element simulations. Fracture models considering the effect of stress state, in terms of stress triaxiality and Lode angle parameter, were examined in both stress space and strain space. A stress-based fracture framework best captured the failure behavior across the range of studied defect sizes. Ti-6Al-4V was compared against the more ductile stainless steel 316L, where a strain-based ductile fracture model was more appropriate. The difference arises from an increasing relative magnitude of elastic deformation for less ductile materials. |