From microstructural features to effective toughness in disordered brittle solids
نویسندگان
چکیده
منابع مشابه
4 Effective toughness of heterogeneous brittle materials
A heterogeneous brittle material characterized by a random field of local toughness K c (x) can be represented by an equivalent homogeneous medium of toughness, K eff. Homogenization refers to a process of estimating K eff from the local field K c (x). An approach based on a perturbative expansion of the stress intensity factor along a rough crack front shows the occurrence of different regimes...
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The experimentally determined marked rise of the stress intensity factor required to initiate crack propagation in brittle solids under variably high loading rates, is analyzed. This problem of fracture initiation at the tip of a crack is considered in terms of activating a flaw at some distance away from the tip. By using a semi-infinite crack in an unbounded two-dimensional solid subjected to...
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*Correspondence: Daniel Bonamy, Laboratoire SPHYNX, Service de Physique de l’État Condensé, DSM, Institut Rayonnement Matière de Saclay, CEA Saclay, CNRS URA 2464, Batiment 772, Orme des Merisiers, F-91191 Gif sur Yvette Cedex, France e-mail: [email protected] We analyze the intermittent dynamics of cracks in heterogeneous brittle materials and the roughness of the resulting fracture surface...
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We introduce a lattice model able to describe damage and yielding in heterogeneous materials ranging from brittle to ductile ones. Ductile fracture surfaces, obtained when the system breaks once the strain is completely localized, are shown to correspond to minimum energy surfaces. The similarity of the resulting fracture paths to the limits of brittle fracture or minimum energy surfaces is qua...
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This thesis consists of three main chapters, an introduction, and an appendix. The introduction (chapter 1) gives a general historical introduction to the problem of brittle fracture in disordered media. Chapters 2 and 4 are concerned with various aspects of fracture in disordered fuse networks. Chapter 2 investigates the asymptotic properties of fracture strength distributions, and explores th...
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ژورنال
عنوان ژورنال: EPL (Europhysics Letters)
سال: 2014
ISSN: 0295-5075,1286-4854
DOI: 10.1209/0295-5075/105/34003