Results 251 to 260 of about 34,140 (308)
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2013
Abstract A brittle fracture occurs at stresses below the material's yield strength (i.e., in the elastic range of the stress-strain diagram). This chapter focuses on brittle fracture in metals and, more specifically, ferrous alloys. It lists the factors that must all be present simultaneously in order to cause brittle fracture in a ...
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Abstract A brittle fracture occurs at stresses below the material's yield strength (i.e., in the elastic range of the stress-strain diagram). This chapter focuses on brittle fracture in metals and, more specifically, ferrous alloys. It lists the factors that must all be present simultaneously in order to cause brittle fracture in a ...
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How brittle is brittle fracture?
Engineering Fracture Mechanics, 1979Abstract A critical survey is given of what appear to be the basics of the field of fracture mechanics. The survey is certainly not exhaustive and is approached from the viewpoint and with the pre-suppositions of a “materials” as opposed to a “mechanics” person.
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Metal Science and Heat Treatment, 1992
1. The brittle fracture mechanism was considered taking into consideration the results of earlier conducted works [29, 35, 46]. 2. To determine the brittle strength of iron alloys the equation $$\sigma _{br} \cong 20 000\sqrt {\frac{r}{l},} $$ where r is the radius at the crack tip (most probable 0.01 ...
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1. The brittle fracture mechanism was considered taking into consideration the results of earlier conducted works [29, 35, 46]. 2. To determine the brittle strength of iron alloys the equation $$\sigma _{br} \cong 20 000\sqrt {\frac{r}{l},} $$ where r is the radius at the crack tip (most probable 0.01 ...
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International Journal of Fracture Mechanics, 1972
The equation of motion and the stability conditions of surface cracks which are subjected to stress waves are derived from an energy balance and the law of angular momentum conservation. From the resulting differential equation the terminal crack velocity and dynamic threshold conditions can be derived. It will be shown that not only a critical stress (
B. Steverding, S. H. Lehnigk
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The equation of motion and the stability conditions of surface cracks which are subjected to stress waves are derived from an energy balance and the law of angular momentum conservation. From the resulting differential equation the terminal crack velocity and dynamic threshold conditions can be derived. It will be shown that not only a critical stress (
B. Steverding, S. H. Lehnigk
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Fractures in Brittle Bone Diseases
Orthopedic Clinics of North America, 1972SUMMARY In lightly covering most of the bone disorders associated with osseous structural fragility one finds that with the exception of untreated osteomalacia, healing is not a problem. Prevention of deformity is the major concern in many of these conditions, and although fracture union can be expected without resorting to unusual measures, operative
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Modelling brittle and semi-brittle fracture processes
Materials Science and Engineering: A, 2001Recent advances in the microscopic modelling of fracture processes are summarised and discussed in this paper. Examples are taken from ab-initio simulations and empirical atomistic modelling of brittle fracture which show that the production of metastable fracture surfaces or directional cleavage anisotropy are readily anticipated consequences of the ...
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Brittle Fracture Initiation in Local Brittle Zones
1991The initiation of brittle fracture within an idealised linear local brittle zone (LBZ) has been studied by comparing the toughness properties of the CGHAZ of an EB weld with specimens heat treated to represent the microstructure of the CGHAZ in bulk. Comparison of Ju, Kmax and δu values shows that each reflects different aspects of the failure process ...
P. Woollin, J. F. Knott
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Brittle Fracture: Micromechanics
1991Publisher Summary This chapter elaborates the formation of flaws. It describes the principal relationships between the flaw type and size and the ultimate failure stress. Fracture in brittle solids results from discrete flaws, activated by an applied or concentrated stress.
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Fracture of Brittle Microbeams
Journal of Applied Mechanics, 2004The random polycrystalline microstructure of microbeams necessitates a reexamination of the crack driving force G stemming from the Griffith fracture criterion. It is found that, in the case of dead-load conditions, G computed by straightforward averaging of the spatially random elastic modulus E is lower than that obtained by correct ensemble ...
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