A Novel Specimen Produced by Additive Manufacturing for Pure Plane Strain Fatigue Crack Growth Studies
Fatigue crack growth is usually studied using C(T) or M(T) specimens with through-thickness 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 cra...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-03-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/11/3/433 |
| _version_ | 1797413289935765504 |
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| author | Joel de Jesus Micael Borges Fernando Antunes José Ferreira Luis Reis Carlos Capela |
| author_facet | Joel de Jesus Micael Borges Fernando Antunes José Ferreira Luis Reis Carlos Capela |
| author_sort | Joel de Jesus |
| collection | DOAJ |
| description | Fatigue crack growth is usually studied using C(T) or M(T) specimens with through-thickness 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-ΔK 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. |
| first_indexed | 2024-03-09T05:16:19Z |
| format | Article |
| id | doaj.art-c2127bdff7394e5b9755a87420503e8e |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-09T05:16:19Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-c2127bdff7394e5b9755a87420503e8e2023-12-03T12:45:54ZengMDPI AGMetals2075-47012021-03-0111343310.3390/met11030433A Novel Specimen Produced by Additive Manufacturing for Pure Plane Strain Fatigue Crack Growth StudiesJoel de Jesus0Micael Borges1Fernando Antunes2José Ferreira3Luis Reis4Carlos Capela5Centre for Mechanical Engineering, Materials and Processes (CEMMPRE), Department of Mechanical Engineering, Univ Coimbra, 3030-788 Coimbra, PortugalCentre for Mechanical Engineering, Materials and Processes (CEMMPRE), Department of Mechanical Engineering, Univ Coimbra, 3030-788 Coimbra, PortugalCentre for Mechanical Engineering, Materials and Processes (CEMMPRE), Department of Mechanical Engineering, Univ Coimbra, 3030-788 Coimbra, PortugalCentre for Mechanical Engineering, Materials and Processes (CEMMPRE), Department of Mechanical Engineering, Univ Coimbra, 3030-788 Coimbra, PortugalIDMEC, Instituto Superior Técnico, Av. Rovisco Pais 1, 1049-001 Lisbon, PortugalDepartment of Mechanical Engineering, ESTG, Instituto Politécnico de Leiria, Morro do Lena—Alto Vieiro, 2400-901 Leiria, PortugalFatigue crack growth is usually studied using C(T) or M(T) specimens with through-thickness 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-ΔK 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.https://www.mdpi.com/2075-4701/11/3/433central crackplane strain statevacuumadditive manufacturingTi6Al4V |
| spellingShingle | Joel de Jesus Micael Borges Fernando Antunes José Ferreira Luis Reis Carlos Capela A Novel Specimen Produced by Additive Manufacturing for Pure Plane Strain Fatigue Crack Growth Studies Metals central crack plane strain state vacuum additive manufacturing Ti6Al4V |
| title | A Novel Specimen Produced by Additive Manufacturing for Pure Plane Strain Fatigue Crack Growth Studies |
| title_full | A Novel Specimen Produced by Additive Manufacturing for Pure Plane Strain Fatigue Crack Growth Studies |
| title_fullStr | A Novel Specimen Produced by Additive Manufacturing for Pure Plane Strain Fatigue Crack Growth Studies |
| title_full_unstemmed | A Novel Specimen Produced by Additive Manufacturing for Pure Plane Strain Fatigue Crack Growth Studies |
| title_short | A Novel Specimen Produced by Additive Manufacturing for Pure Plane Strain Fatigue Crack Growth Studies |
| title_sort | novel specimen produced by additive manufacturing for pure plane strain fatigue crack growth studies |
| topic | central crack plane strain state vacuum additive manufacturing Ti6Al4V |
| url | https://www.mdpi.com/2075-4701/11/3/433 |
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