Fracture and relaxation in dense cornstarch suspensions
Dense suspensions exhibit the remarkable ability to switch dynamically and reversibly from a fluid-like to a solid-like, shear-jammed (SJ) state. Here, we show how this transition has important implications for the propensity for forming fractures. We inject air into bulk dense cornstarch suspension...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | en_US |
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Oxford University Press
2024
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| Online Access: | https://hdl.handle.net/1721.1/153540 |
| _version_ | 1826207830999302144 |
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| author | Lilin, Paul Elkhoury, Jean E Peters, Ivo R Bischofberger, Irmgard |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Lilin, Paul Elkhoury, Jean E Peters, Ivo R Bischofberger, Irmgard |
| author_sort | Lilin, Paul |
| collection | MIT |
| description | Dense suspensions exhibit the remarkable ability to switch dynamically and reversibly from a fluid-like to a solid-like, shear-jammed (SJ) state. Here, we show how this transition has important implications for the propensity for forming fractures. We inject air into bulk dense cornstarch suspensions and visualize the air invasion into the opaque material using time-resolved X-ray radiography. For suspensions with cornstarch mass fractions high enough to exhibit discontinuous shear thickening and shear jamming, we show that air injection leads to fractures in the material. For high mass fractions, these fractures grow quasistatically as rough cavities with fractured interfaces. For lower mass fractions, remarkably, the fractures can relax to smooth bubbles that then rise under buoyancy. We show that the onset of the relaxation occurs as the shear rate induced by the air cavity growth decreases below the critical shear rate denoting the onset of discontinuous shear thickening, which reveals a structural signature of the SJ state. |
| first_indexed | 2024-09-23T13:55:38Z |
| format | Article |
| id | mit-1721.1/153540 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T13:55:38Z |
| publishDate | 2024 |
| publisher | Oxford University Press |
| record_format | dspace |
| spelling | mit-1721.1/1535402024-09-20T19:08:13Z Fracture and relaxation in dense cornstarch suspensions Lilin, Paul Elkhoury, Jean E Peters, Ivo R Bischofberger, Irmgard Massachusetts Institute of Technology. Department of Mechanical Engineering Dense suspensions exhibit the remarkable ability to switch dynamically and reversibly from a fluid-like to a solid-like, shear-jammed (SJ) state. Here, we show how this transition has important implications for the propensity for forming fractures. We inject air into bulk dense cornstarch suspensions and visualize the air invasion into the opaque material using time-resolved X-ray radiography. For suspensions with cornstarch mass fractions high enough to exhibit discontinuous shear thickening and shear jamming, we show that air injection leads to fractures in the material. For high mass fractions, these fractures grow quasistatically as rough cavities with fractured interfaces. For lower mass fractions, remarkably, the fractures can relax to smooth bubbles that then rise under buoyancy. We show that the onset of the relaxation occurs as the shear rate induced by the air cavity growth decreases below the critical shear rate denoting the onset of discontinuous shear thickening, which reveals a structural signature of the SJ state. 2024-02-16T18:37:55Z 2024-02-16T18:37:55Z 2023-12-21 Article http://purl.org/eprint/type/JournalArticle 2752-6542 https://hdl.handle.net/1721.1/153540 Paul Lilin, Jean E Elkhoury, Ivo R Peters, Irmgard Bischofberger, Fracture and relaxation in dense cornstarch suspensions, PNAS Nexus, Volume 3, Issue 1, January 2024, pgad451. en_US 10.1093/pnasnexus/pgad451 PNAS Nexus Creative Commons Attribution https://creativecommons.org/licenses/by/4.0/ application/pdf Oxford University Press Oxford University Press |
| spellingShingle | Lilin, Paul Elkhoury, Jean E Peters, Ivo R Bischofberger, Irmgard Fracture and relaxation in dense cornstarch suspensions |
| title | Fracture and relaxation in dense cornstarch suspensions |
| title_full | Fracture and relaxation in dense cornstarch suspensions |
| title_fullStr | Fracture and relaxation in dense cornstarch suspensions |
| title_full_unstemmed | Fracture and relaxation in dense cornstarch suspensions |
| title_short | Fracture and relaxation in dense cornstarch suspensions |
| title_sort | fracture and relaxation in dense cornstarch suspensions |
| url | https://hdl.handle.net/1721.1/153540 |
| work_keys_str_mv | AT lilinpaul fractureandrelaxationindensecornstarchsuspensions AT elkhouryjeane fractureandrelaxationindensecornstarchsuspensions AT petersivor fractureandrelaxationindensecornstarchsuspensions AT bischofbergerirmgard fractureandrelaxationindensecornstarchsuspensions |