On the consequences of intrinsic and extrinsic size effects on the mechanical response of nanoporous Au
In this study, the consequence of intrinsic and extrinsic size effects on mechanical responses of nanoporous gold is investigated via microcompression testing. By varying the micropillar diameter (D) between 1 µm and 20 µm and the ligament size (L), 50 nm and 350 nm, a critical ratio (α = D/L = 20)...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-08-01
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| Series: | Materials & Design |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127523005907 |
| _version_ | 1797736216716640256 |
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| author | Yijuan Wu Jürgen Markmann Erica T. Lilleodden |
| author_facet | Yijuan Wu Jürgen Markmann Erica T. Lilleodden |
| author_sort | Yijuan Wu |
| collection | DOAJ |
| description | In this study, the consequence of intrinsic and extrinsic size effects on mechanical responses of nanoporous gold is investigated via microcompression testing. By varying the micropillar diameter (D) between 1 µm and 20 µm and the ligament size (L), 50 nm and 350 nm, a critical ratio (α = D/L = 20) was found, above which the test structure can be considered a representative volume element, resulting in identical mechanical response and uniform deformation. Below that value, both flow stress and elastic modulus decrease with decreasing pillar diameter, as evidenced for a measurement series with a fixed ligament size of 350 nm where the flow stress decreased by more than 50% (from approximately 5 to 2.5 MPa) and the elastic modulus was reduced from approximately 0.5 GPa to almost zero. Stochastic behavior along with non-uniform deformation and failure is observed for α < 10, suggesting that the size of the load-bearing units in this material is about 10 times the corresponding ligament size. |
| first_indexed | 2024-03-12T13:10:26Z |
| format | Article |
| id | doaj.art-9a88f2b50673444f9181d9df7a1f5963 |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-03-12T13:10:26Z |
| publishDate | 2023-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-9a88f2b50673444f9181d9df7a1f59632023-08-28T04:22:33ZengElsevierMaterials & Design0264-12752023-08-01232112175On the consequences of intrinsic and extrinsic size effects on the mechanical response of nanoporous AuYijuan Wu0Jürgen Markmann1Erica T. Lilleodden2Helmholtz-Zentrum Hereon, Institute of Materials Mechanics, 21502 Geesthacht, GermanyHelmholtz-Zentrum Hereon, Institute of Materials Mechanics, 21502 Geesthacht, Germany; Hamburg University of Technology, Institute of Materials Physics and Technology, 21073 Hamburg, Germany; Corresponding author at: Helmholtz-Zentrum Hereon, Institute of Materials Mechanics, 21502 Geesthacht, Germany.Helmholtz-Zentrum Hereon, Institute of Materials Mechanics, 21502 Geesthacht, Germany; Fraunhofer Institute for Microstructure of Materials and Systems, 06120 Halle, GermanyIn this study, the consequence of intrinsic and extrinsic size effects on mechanical responses of nanoporous gold is investigated via microcompression testing. By varying the micropillar diameter (D) between 1 µm and 20 µm and the ligament size (L), 50 nm and 350 nm, a critical ratio (α = D/L = 20) was found, above which the test structure can be considered a representative volume element, resulting in identical mechanical response and uniform deformation. Below that value, both flow stress and elastic modulus decrease with decreasing pillar diameter, as evidenced for a measurement series with a fixed ligament size of 350 nm where the flow stress decreased by more than 50% (from approximately 5 to 2.5 MPa) and the elastic modulus was reduced from approximately 0.5 GPa to almost zero. Stochastic behavior along with non-uniform deformation and failure is observed for α < 10, suggesting that the size of the load-bearing units in this material is about 10 times the corresponding ligament size.http://www.sciencedirect.com/science/article/pii/S0264127523005907Microcompression testingNanoporus goldMicrostructural size effectSample size effect |
| spellingShingle | Yijuan Wu Jürgen Markmann Erica T. Lilleodden On the consequences of intrinsic and extrinsic size effects on the mechanical response of nanoporous Au Materials & Design Microcompression testing Nanoporus gold Microstructural size effect Sample size effect |
| title | On the consequences of intrinsic and extrinsic size effects on the mechanical response of nanoporous Au |
| title_full | On the consequences of intrinsic and extrinsic size effects on the mechanical response of nanoporous Au |
| title_fullStr | On the consequences of intrinsic and extrinsic size effects on the mechanical response of nanoporous Au |
| title_full_unstemmed | On the consequences of intrinsic and extrinsic size effects on the mechanical response of nanoporous Au |
| title_short | On the consequences of intrinsic and extrinsic size effects on the mechanical response of nanoporous Au |
| title_sort | on the consequences of intrinsic and extrinsic size effects on the mechanical response of nanoporous au |
| topic | Microcompression testing Nanoporus gold Microstructural size effect Sample size effect |
| url | http://www.sciencedirect.com/science/article/pii/S0264127523005907 |
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