Topic
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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TL;DR: There are more than 200 different methods for measuring thin film adhesion, suggesting it to be material, geometry and even industry specific as discussed by the authors, suggesting that the major extrinsic variables are film stress, extent of delamination, thickness and temperature while the major intrinsic ones are modulus, yield strength, the thermodynamic work of adhesion and one or more length scales.
600 citations
TL;DR: In this article, a technical review of fracture toughness testing, evaluation and standardization for metallic materials in terms of the linear elastic fracture mechanics as well as the elastic-plastic fracture mechanics is given.
594 citations
TL;DR: In this paper, three ferrite/martensite dual-phase steels varying in the ferrite grain size (12.4, 2.4 and 1.2μm) but with the same martensite content (∼30 vol%) were produced by large-strain warm deformation at different deformation temperatures, followed by intercritical annealing.
590 citations
TL;DR: The fracture toughness of Al2O3 is considerably increased by the incorporation of fine monoclinic ZrO2 particles in hot-pressed composites as mentioned in this paper, and the increase results from a high density of small matrix micro cracks absorbing energy by slow propagation.
Abstract: The fracture toughness of Al2O3 is considerably increased by the incorporation of fine monoclinic ZrO2 particles. Hot-pressed composites containing 15 vol % ZrO2 yield Klcvalues of ∼ 10 MN/m3/2, twice that of the A12O3 matrix. It is hypothesized that this increase results from a high density of small matrix microcracks absorbing energy by slow propagation. The microcracks are formed by the expansion of ZrO2during the tetragonal → monoclinic transformation. Since extremely high tensile stresses develop in the matrix, very small ZrO2 particles can act as crack formers, thus limiting the critical flaw size to small values.
577 citations
TL;DR: A synergy of multiple deformation mechanisms is identified, rarely achieved in metallic alloys, which generates high strength, work hardening and ductility, including the easy motion of Shockley partials, their interactions to form stacking-fault parallelepipeds, and arrest at planar slip bands of undissociated dislocations.
Abstract: Damage tolerance can be an elusive characteristic of structural materials requiring both high strength and ductility, properties that are often mutually exclusive. High-entropy alloys are of interest in this regard. Specifically, the single-phase CrMnFeCoNi alloy displays tensile strength levels of ∼ 1 GPa, excellent ductility (∼ 60-70%) and exceptional fracture toughness (KJIc>200 MPa√m). Here through the use of in situ straining in an aberration-corrected transmission electron microscope, we report on the salient atomistic to micro-scale mechanisms underlying the origin of these properties. We identify a synergy of multiple deformation mechanisms, rarely achieved in metallic alloys, which generates high strength, work hardening and ductility, including the easy motion of Shockley partials, their interactions to form stacking-fault parallelepipeds, and arrest at planar slip bands of undissociated dislocations. We further show that crack propagation is impeded by twinned, nanoscale bridges that form between the near-tip crack faces and delay fracture by shielding the crack tip.
575 citations