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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 paper, the Hall-Petch relationship with high constants in fully-lamellar material is explained as a combined function of grain-size and deformation-anisotropy.

173 citations

Journal ArticleDOI
TL;DR: L lithiated silicon demonstrates a unique ability to flow plastically and fracture in a brittle manner and is essentially independent of the concentration of lithium.
Abstract: We have measured the fracture energy of lithiated silicon thin-film electrodes as a function of lithium concentration. To this end, we have constructed an electrochemical cell capable of testing multiple thin-film electrodes in parallel. The stress in the electrodes is measured during electrochemical cycling by the substrate curvature technique. The electrodes are disconnected one by one after delithiating to various states of charge, that is, to various concentrations of lithium. The electrodes are then examined by optical microscopy to determine when cracks first form. All of the observed cracks appear brittle in nature. By determining the condition for crack initiation, the fracture energy is calculated using an analysis from fracture mechanics. In the same set of experiments, the fracture energy at a second state of charge (at small concentrations of lithium) is measured by determining the maximum value of the stress during delithiation. The fracture energy was determined to be Γ = 8.5 ± 4.3 J/m2 at s...

173 citations

Journal ArticleDOI
TL;DR: In this article, two failure criteria are proposed for brittle fracture in rounded-tip V-shaped notches under pure mode I loading, one of these criteria is developed based on the mean stress criterion and the other based on point stress criterion.

173 citations

Journal ArticleDOI
TL;DR: In this article, the fracture strength of metal reinforced ceramics, especially Al/Al2O3 composites with interpenetrating networks, is analyzed and a simple model accounts for the influence of metal volume and metal ligament diameter on the plateau toughness of the composites.
Abstract: The mechanical properties of metal reinforced ceramics, especially Al/Al2O3 composites with interpenetrating networks, are described. Key parameters to tailor the characteristics of these materials are the ligament diameter and volume fraction of ductile reinforcement. Fracture strength and fracture toughness data are given as a function of both variables and are compared with the corresponding values for the porous preforms. A simple model accounts for the influence of metal volume and metal ligament diameter on the plateau toughness of the composites. The increase in fracture strength from the porous preform to the composite is found to be much larger than the gain which can be predicted from the increase in fracture toughness alone. A discussion of fracture strength in these composites therefore must include at least two issues, crack propagation through the matrix as well as crack initiation at metal filled pores.

173 citations

Journal ArticleDOI
TL;DR: In this paper, the dependence of the energy release rate ratio on the in-plane stress was analyzed and the non-dimensional stress parameter, σ 0(a/E* Ti)1/2, where a is the initial length of the kink into the substrate, E* is a modulus quantity, and Ti is the fracture energy of the interface.
Abstract: A crack lying in the interface between two brittle elastic solids can advance either by continued growth in the interface or by kinking out of the interface into one of the adjoining materials. This competition can be assessed by comparing the ratio of the energy release rates for interface cracking and for kinking out of the interface to the ratio of interface toughness to substrate toughness. The stress parallel to the interface, σ0, influences the energy release rate of the kinked crack and can significantly alter the conditions for interface cracking over substrate cracking if sufficiently large. This paper provides the dependence of the energy release rate ratio on the in-plane stress. The nondimensional stress parameter which emerges is, σ0(a/E* Ti)1/2, where a is the initial length of the kink into the substrate, E* is a modulus quantity, and Ti is the fracture energy of the interface. An experimental observation of the cracking of reaction product layers in bonds between Ti(Ta) and Al2O3 is rationalized by the theory.

173 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