Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 538303
Title Laser Speckle Strain Imaging reveals the origin of delayed fracture in a soft solid
Author(s) Kooij, Hanne M. van der; Dussi, Simone; Kerkhof, Gea T. van de; Frijns, Raoul A.M.; Gucht, Jasper van der; Sprakel, Joris
Source Science Advances 4 (2018)5. - ISSN 2375-2548
DOI https://doi.org/10.1126/sciadv.aar1926
Department(s) Physical Chemistry and Soft Matter
Laboratory of Molecular Biology
VLAG
Publication type Refereed Article in a scientific journal
Publication year 2018
Abstract

Stresses well below the critical fracture stress can lead to highly unpredictable delayed fracture after a long period of seemingly quiescent stability. Delayed fracture is a major threat to the lifetime of materials, and its unpredictability makes it difficult to prevent. This is exacerbated by the lack of consensus on the microscopic mechanisms at its origin because unambiguous experimental proof of these mechanisms remains absent. We present an experimental approach to measure, with high spatial and temporal resolution, the local deformations that precipitate crack nucleation. We apply this method to study delayed fracture in an elastomer and find that a delocalized zone of very small strains emerges as a consequence of strongly localized damage processes. This prefracture deformation zone grows exponentially in space and time, ultimately culminating in the nucleation of a crack and failure of the material as a whole. Our results paint a microscopic picture of the elusive origins of delayed fracture and open the way to detect damage well before it manifests macroscopically.

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