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ENHANCED FATIGUE AND LIGHTWEIGHT POTENTIAL ASSESSMENT OF ADDITIVELY MANUFACTURED MATERIALS BY SPECIFIC SHIOZAWA DIAGRAMS

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Abstract:

The additive manufacturing (AM) process enables the fabrication of the components layer-by-layer. Therefore, it can produce complex near-net-shapes with unprecedented degrees of freedom that the conventional manufacturing processes cannot do. Due to the fine microstructures generated by the high cooling rates of the AM process, the tensile strength is improved, whereas the fatigue strength is similar or even reduced. The reason is the formulation of process-induced defects during the manufacturing process itself, which results in increasing the notch stress sensitivity that will affect the fatigue behavior at end. In this work, the fatigue damage tolerance for three AM materials (aluminum, titanium aluminide, and stainless steel) with process-induced defects is assessed using Shiozawa approach for enhanced fatigue assessment. Moreover, the effect of the lightweight potential is investigated by considering the specific-density of the three alloys and how it can enhance the fatigue damage tolerance assessment. Furthermore, the lightweight potential for the three AM alloys will be studied when applying a constant force on specimens of constant mass and length.

Reference
ADD-2022-005

Title
ENHANCED FATIGUE AND LIGHTWEIGHT POTENTIAL ASSESSMENT OF ADDITIVELY MANUFACTURED MATERIALS BY SPECIFIC SHIOZAWA DIAGRAMS
Author(s)
M. Merghany, M. Teschke, F. Stern, J. Tenkamp, F. Walther
DOI
10.48447/ADD-2022-005
Year of publication
2022
Publication type
conference paper (PDF)
Language
English
Keywords
Laser powder bed fusion (PBF-LB), electron beam powder bed fusion (PBF-EB), AlSi10Mg, TiAl, 316L, fatigue behavior, fatigue damage tolerance