On Crack Dynamics in Brittle Heterogeneous Materials

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Carlsson, Jenny,1984-Uppsala universitet,Tillämpad mekanik (författare)

On Crack Dynamics in Brittle Heterogeneous Materials

BokEngelska2020

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Uppsala :Acta Universitatis Upsaliensis,2020
55 s.
electronicrdacarrier

Nummerbeteckningar

LIBRIS-ID:oai:DiVA.org:uu-406919
ISBN:9789151309064
https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-406919URI

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Språk:engelska
Sammanfattning på:engelska

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Ämneskategori:vet swepub-contenttype
Ämneskategori:dok swepub-publicationtype

Serie

Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology,1651-6214 ;1917

Anmärkningar

Natural variation, sub-structural features, heterogeneity and porosity make fracture modelling of wood and many other heterogeneous and cellular materials challenging. In this thesis, fracture in such complicated materials is simulated using phase field methods for fracture. Phase field methods have shown promise in simulations of complex geometries as well as dynamics and require few additional parameters; only the material toughness and a length parameter, determining the width of a regularised crack, are needed.First, a dynamic phase field model is developed and validated against experiments performed on homogeneous brittle polymeric materials, wood fibre composites and polymeric materials with different hole patterns. Then, a high-resolution model of wood is developed and related to experiments, this time without considering fracture. Attention is finally focussed on high-resolution numerical analyses of fracture in wood and other cellular microstructures, considering both heterogeneity and relative density.The phase field model is found to reproduce crack paths, velocities and energy release rates well in homogeneous samples both with and without holes. In more complicated heterogeneous and porous materials, the model is also able to simulate crack paths, but the interpretation of the length scale is complicated by the inherent lengths of the micro-structural geometry. In sum, the thesis points to possibilities with the proposed method, as well as limitations in our current understanding of both quasistatic and dynamic fracture of heterogeneous and cellular materials. The findings of this thesis can contribute to an improved understanding of fracture in such materials.

Ämnesord och genrebeteckningar

TEKNIK OCH TEKNOLOGIER Maskinteknik Teknisk mekanik hsv//swe
ENGINEERING AND TECHNOLOGY Mechanical Engineering Applied Mechanics hsv//eng
Engineering science with specialization in Applied Mechanics
Teknisk fysik med inriktning mot tillämpad mekanik

Biuppslag (personer, institutioner, konferenser, titlar ...)

Isaksson, Per (preses)
Wiklund, Urban (preses)
Persson, Cecilia,ProfessorUppsala universitet,Tillämpad materialvetenskap(Swepub:uu)cecpe877 (preses)
Denzer, Ralf,Associate ProfessorLund University (opponent)
Uppsala universitetTillämpad mekanik (creator_code:org_t)

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Av författaren/redakt...: Carlsson, Jenny, ...; Isaksson, Per; Wiklund, Urban; Persson, Cecilia ...; Denzer, Ralf, As ...

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TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Maskinteknik; och Teknisk mekanik

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Av lärosätet: Uppsala universitet

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