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Fracture toughness

About: Fracture toughness is a research topic. Over the lifetime, 39642 publications have been published within this topic receiving 854338 citations.


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Journal ArticleDOI
TL;DR: In this article, a generalization of recently developed continuum phase field models from brittle to ductile fracture coupled with thermo-plasticity at finite strains is presented, which uses a geometric approach to the diffusive crack modeling based on the introduction of a balance equation for a regularized crack surface.

407 citations

Journal ArticleDOI
TL;DR: In this paper, the conditions for the existence of a cleavage crack in a lattice and its response to all types of external loads when shielded by neighboring dislocations are considered.

407 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present some observations in several composite systems of toughening by a plastic stretching mechanism and describe models of the stretching process, and some of the salient aspects of the toughness of brittle matrices emerge from a comparison between theory and experiment.

404 citations

Journal ArticleDOI
TL;DR: In this article, a catalog of small-scale bridging solutions is compiled for idealized bridging laws, and a set of normalization is introduced to present the design charts, segregating the roles played by the shape and the scale, of a bridging law.
Abstract: The article draws upon recent work by us and our colleagues on metal and ceramic matrix composites for high temperature engines. The central theme here is to deduce mechanical properties, such as toughness, strength and notch-ductility, from bridging laws that characterize inelastic processes associated with fracture. A particular set of normalization is introduced to present the design charts, segregating the roles played by the shape, and the scale, of a bridging law. A single material length, {gamma}{sub 0}E/{sigma}{sub 0}, emerges, where {gamma}{sub 0} is the limiting-separation, {sigma}{sub 0} the bridging-strength, and E the Young`s modulus of the solid. It is the huge variation of this length-from a few manometers for atomic bond, to a meter for cross-over fibers - that underlies the richness in material behaviors. Under small-scale bridging conditions, {gamma}{sub 0}E/{sigma}{sub 0} is the only basic length scale in the mechanics problem and represents, with a pre-factor about 0.4, the bridging zone size. A catalog of small-scale bridging solutions is compiled for idealized bridging laws. Large-scale bridging introduces a dimensionless group, a/({gamma}{sub 0}E/{sigma}{sub 0}), where a is a length characterizing the component. The group plays a major role in all phenomena associated with bridging, and provides a focus ofmore » discussion in this article. For example, it quantifies the bridging scale when a is the unbridged crack length, and notch-sensitivity when a is hole radius. The difference and the connection between Irwin`s fracture mechanics and crack bridging concepts are discussed. It is demonstrated that fracture toughness and resistance curve are meaningful only when small-scale bridging conditions prevail, and therefore of limited use in design with composites. Many other mechanical properties of composites, such as strength and notch-sensitivity, can be simulated by invoking large-scale bridging concepts. 37 refs., 21 figs., 3 tabs.« less

402 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023972
20222,107
20211,361
20201,324
20191,383
20181,305