Affiliation:
1. Department of Mechanical and Electrical Engineering University of Southern Denmark Odense Denmark
2. Faculty of Mechanical Engineering Kiel University of Applied Sciences Kiel Germany
Abstract
AbstractThis study investigates the fatigue behavior of small specimens of Ti‐6Al‐4 V produced using the additive manufacturing process cold metal fusion. As the process is still comparatively new, no data were available beforehand. Strain‐controlled fatigue tests were carried out on small specimens under alternating loads. The results are presented in the form of a stress–strain diagram according to Ramberg–Osgood and a strain–life curve according to Coffin–Manson. Comparison with results reported for similar specimens fabricated via the laser engineered net shaping (LENS) additive method shows comparable fatigue behavior. Analysis of the fracture surfaces shows a very mixed fracture pattern with an often mountainous surface, especially for specimens tested under high strain. This made the detection of crack initiation very difficult for those specimens. The analysis of specimens tested under low strain reveals large surface defects to be the crack initiators. Smaller secondary cracks form at internal crack initiation facets.
Funder
European Regional Development Fund
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
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