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Title: A Novel Specimen Produced by Additive Manufacturing for Pure Plane Strain Fatigue Crack Growth Studies
Authors: Jesus, Joel de 
Borges, Micael 
Antunes, Fernando 
Ferreira, José 
Reis, Luis
Capela, Carlos 
Keywords: Additive manufacturing; Central crack; Plane strain state; Ti6Al4V; Vacuum
Issue Date: 2021
Project: CENTRO-01-0145-FEDER-028789 
FCT project LAETA/IDMEC, project UIDB/50022/2020 
Serial title, monograph or event: Metals
Volume: 11
Issue: 3
Abstract: Fatigue crack growth is usually studied using C(T) or M(T) specimens with throughthickness cracks. The objective of the present study is to propose a cylindrical specimen with central crack, produced by additive manufacturing. This geometry allows to have pure plane strain state along the whole crack front, avoiding the complexities associated with corner points, crack shape, and variation of crack closure along crack front. Additionally, this geometry may be used to develop studies in vacuum, avoiding expensive vacuum equipment, since the air is not in contact with the crack front. Cylindrical specimens of Ti6Al4V titanium alloy were produced by Selective Laser Melting and tested at a stress ratio R = 0. Marking with overloads was the solution adopted to measure the length of the internal cracks. The fracture surfaces presented circular crack fronts and the da/dN-DK curves showed a great influence of atmosphere on fatigue crack growth. An average difference of 50% was found between the results in air and vacuum. Therefore, this geometry with internal crack is an interesting alternative to through-thickness geometries.
ISSN: 2075-4701
DOI: 10.3390/met11030433
Rights: openAccess
Appears in Collections:I&D CEMMPRE - Artigos em Revistas Internacionais

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