Fracture behaviour of notched as-built EBM parts: Characterization and interplay between defects and notch strengthening behaviour
作者： Mirco Peron , Jan Torgersen , Paolo Ferro , Filippo Berto
DOI: 10.1016/J.TAFMEC.2018.10.004
关键词: Critical load 、 Scanning electron microscope 、 Bearing (mechanical) 、 Characterization (materials science) 、 Stress (mechanics) 、 Composite material 、 Fracture (geology) 、 Complex geometry 、 Ultimate tensile strength 、 Materials science
摘要: Abstract Additive manufacturing (AM) offers the potential to economically produce customized components with complex geometries. However, introduction of geometry goes hand in presence notches. Thus, basic understanding tensile behaviour AM fabricated notched must be substantially improved so that unique features this rapidly developing technology can utilized critical load bearing applications. This work aims assess different specimens manufactured by means Electron Beam Melting (EBM) and tested their as-built conditions order reveal interplay between notch specific processing. Scanning Microscopy (SEM) was used investigate fracture surface broken samples, revealing process-induced defects, harmfully affecting strength a reduction 10% elongation failure 40% respect values reported literature for heat treated parts, respectively. Interestingly, authors have discovered an increase severity stress concentrators, quite contrary what is commonly observed wrought Ti-6Al-4V. strengthening particular related influence defects on driving force. The provide qualitative explanation phenomenon using 3D FE analyses together theoretical description via ellipse criterion.
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