The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform
S V Kamat - One of the best experts on this subject based on the ideXlab platform.
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effect of Notch Root radius on fracture toughness of ti 18al 8nb alloy
Materials Science and Technology, 2009Co-Authors: Archana Paradkar, A K Gogia, S V KamatAbstract:AbstractThe effect of Notch Root radius on the mode I fracture toughness of Ti–18Al–8Nb alloy in beta solution treated and water quenched condition was investigated. The apparent fracture toughness K IA was found to be independent of the Notch Root radius below a critical Notch Root radius ρ 0 and subsequently increase linearly with the square Root of Notch Root radius ρ1/2 beyond ρ 0. The critical Notch Root radius in this alloy was found to be ∼50 μm. The results were explained on the basis of strain controlled fracture model.
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Effect of Notch Root radius on fracture toughness of Ti–18Al–8Nb alloy
Materials Science and Technology, 2009Co-Authors: Archana Paradkar, A K Gogia, S V KamatAbstract:AbstractThe effect of Notch Root radius on the mode I fracture toughness of Ti–18Al–8Nb alloy in beta solution treated and water quenched condition was investigated. The apparent fracture toughness K IA was found to be independent of the Notch Root radius below a critical Notch Root radius ρ 0 and subsequently increase linearly with the square Root of Notch Root radius ρ1/2 beyond ρ 0. The critical Notch Root radius in this alloy was found to be ∼50 μm. The results were explained on the basis of strain controlled fracture model.
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effects of Notch Root radius on crack initiation and growth toughnesses of a cross ply ti6al4v sic composite
Acta Materialia, 1996Co-Authors: S V Kamat, J P HirthAbstract:Effects of Notch Root radius on the crack initiation and growth toughnesses of a cross-ply [90{degree}/0{degree}]{sub 2s} Ti-6Al-4V/SiC{sub f} composite have been studied. The initiation toughness was found to be independent of the Notch Root radius, below a critical value of {rho} {approximately} 50 {micro}m. Beyond this value, the initiation toughness increases linearly with the Notch Root radius. In contrast, the crack growth toughness was found to be more or less independent of the initial Notch Root radius. The results are rationalized on the basis of the mechanism of fracture as well as the strain concentrations ahead of the Notch.
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Effects of Notch Root radius on crack initiation and growth toughnesses of a cross-ply Ti6Al4V/SiC composite
Acta Materialia, 1996Co-Authors: S V Kamat, J P HirthAbstract:Effects of Notch Root radius on the crack initiation and growth toughnesses of a cross-ply [90{degree}/0{degree}]{sub 2s} Ti-6Al-4V/SiC{sub f} composite have been studied. The initiation toughness was found to be independent of the Notch Root radius, below a critical value of {rho} {approximately} 50 {micro}m. Beyond this value, the initiation toughness increases linearly with the Notch Root radius. In contrast, the crack growth toughness was found to be more or less independent of the initial Notch Root radius. The results are rationalized on the basis of the mechanism of fracture as well as the strain concentrations ahead of the Notch.
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effect of Notch Root radius on ductile fracture toughness of armco iron
International Journal of Fracture, 1992Co-Authors: M Srinivas, S V KamatAbstract:There are situations when fatigue precracking of fracture toughness test specimens is not feasible. A case in point is when mixed mode fracture toughness is to be evaluated [1]. It, then, becomes necessary to determine the influence of the Notch Root radius on the fracture toughness of a material. It is well established that Notch Root radius has a significant influence on the apparent fracture toughness of a material [2-5]." Usually a critical Notch Root radius, below which fracture toughness is independent of Notch Root radius, exists and is measured. We present in this communication the results of an investigation of the effect of Notch-Root radius on mode I fracture toughness (J~o) of Armco iron and a procedure to correct for the same to arrive at the t rue Jic value.
Archana Paradkar - One of the best experts on this subject based on the ideXlab platform.
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effect of Notch Root radius on fracture toughness of ti 18al 8nb alloy
Materials Science and Technology, 2009Co-Authors: Archana Paradkar, A K Gogia, S V KamatAbstract:AbstractThe effect of Notch Root radius on the mode I fracture toughness of Ti–18Al–8Nb alloy in beta solution treated and water quenched condition was investigated. The apparent fracture toughness K IA was found to be independent of the Notch Root radius below a critical Notch Root radius ρ 0 and subsequently increase linearly with the square Root of Notch Root radius ρ1/2 beyond ρ 0. The critical Notch Root radius in this alloy was found to be ∼50 μm. The results were explained on the basis of strain controlled fracture model.
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Effect of Notch Root radius on fracture toughness of Ti–18Al–8Nb alloy
Materials Science and Technology, 2009Co-Authors: Archana Paradkar, A K Gogia, S V KamatAbstract:AbstractThe effect of Notch Root radius on the mode I fracture toughness of Ti–18Al–8Nb alloy in beta solution treated and water quenched condition was investigated. The apparent fracture toughness K IA was found to be independent of the Notch Root radius below a critical Notch Root radius ρ 0 and subsequently increase linearly with the square Root of Notch Root radius ρ1/2 beyond ρ 0. The critical Notch Root radius in this alloy was found to be ∼50 μm. The results were explained on the basis of strain controlled fracture model.
J P Hirth - One of the best experts on this subject based on the ideXlab platform.
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effects of Notch Root radius on crack initiation and growth toughnesses of a cross ply ti6al4v sic composite
Acta Materialia, 1996Co-Authors: S V Kamat, J P HirthAbstract:Effects of Notch Root radius on the crack initiation and growth toughnesses of a cross-ply [90{degree}/0{degree}]{sub 2s} Ti-6Al-4V/SiC{sub f} composite have been studied. The initiation toughness was found to be independent of the Notch Root radius, below a critical value of {rho} {approximately} 50 {micro}m. Beyond this value, the initiation toughness increases linearly with the Notch Root radius. In contrast, the crack growth toughness was found to be more or less independent of the initial Notch Root radius. The results are rationalized on the basis of the mechanism of fracture as well as the strain concentrations ahead of the Notch.
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Effects of Notch Root radius on crack initiation and growth toughnesses of a cross-ply Ti6Al4V/SiC composite
Acta Materialia, 1996Co-Authors: S V Kamat, J P HirthAbstract:Effects of Notch Root radius on the crack initiation and growth toughnesses of a cross-ply [90{degree}/0{degree}]{sub 2s} Ti-6Al-4V/SiC{sub f} composite have been studied. The initiation toughness was found to be independent of the Notch Root radius, below a critical value of {rho} {approximately} 50 {micro}m. Beyond this value, the initiation toughness increases linearly with the Notch Root radius. In contrast, the crack growth toughness was found to be more or less independent of the initial Notch Root radius. The results are rationalized on the basis of the mechanism of fracture as well as the strain concentrations ahead of the Notch.
R Sunder - One of the best experts on this subject based on the ideXlab platform.
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Growth of artificially and naturally initiating Notch Root cracks under FALSTAFF spectrum loading
1994Co-Authors: R Sunder, Raghu Prakash, Ei MitchenkoAbstract:The paper describes an experimental study of Notch Root fatigue crack growth under FALSTAFF spectrum loading in an Al-Cu alloy. Crack growth rates were measured from crack size as small as 20 microns using optical fractography and replication technique. Fractographic measurements indicate similar scatter levels between Notch Root short crack and long growth rate data. This is in contrast to surface replica based measurements which are indicative of large scatter. Growth rate variation was noticed between multiple cracks initiating after different periods of natural crack formation. This is attributed to the influence of larger existing cracks on smaller cracks that appear later. In contrast identical artificially initiating cracks grew at a similar rate
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Notch Root crack closure under cyclic inelasticity
Fatigue & Fracture of Engineering Materials & Structures, 1993Co-Authors: R SunderAbstract:Aluminium alloy sheet coupons with a central hole were tested in fatigue under specially designed programmed load sequences. Electron microscopy of the fatigue fracture surfaces showed striation mode fatigue crack extension up to more than a millimeter before onset of rapid failure. Crack opening stress was determined from striation patterns. Under variable amplitude loading and conditions of Notch Root cyclic inelasticity, crack opening stress exhibits noticeable hysteresis. The hysteresis is attributed to a difference between crack closure and opening stresses. A linear model of this phenomenon appears to describe observed behaviour.
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engineering analysis of Notch Root fatigue crack growth under spectrum loading
International Journal of Fatigue, 1991Co-Authors: R SunderAbstract:An engineering procedure is described to predict Notch Root fatigue crack growth under spectrum loading. Long-crack growth rates and closure data, Notch Root stress-strain analysis and Rainflow cycle counting constitute major inputs to the prediction process. The procedure models non-uniform extension of the part-through crack front, crack growth in compression fatigue and the effect of tensile and compressive overloads. Crack growth predictions under constant-amplitude and combat aircraft spectrum loadings were compared with data from the literature for 2.3 mm and 6.25 mm thick 2024-T3 alloy sheet material. Good predictions were obtained for the thicker material using the linear elastic fracture mechanics approach. The thinner material required inclusion of strain-based intensity and residual stress effects for more realistic predictions. Neglecting these factors as a rule provided life estimates that are not conservative.
Meera N K Singh - One of the best experts on this subject based on the ideXlab platform.
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a comparison between two analytical models that approximate Notch Root elastic plastic strain stress components in two phase particle reinforced metal matrix composites under multiaxial cyclic loading theory
International Journal of Fatigue, 2006Co-Authors: Gbadebo Owolabi, Meera N K SinghAbstract:Abstract In this paper, two analytical models for estimating surface Notch-Root elastic–plastic, strain–stress histories in particulate metal matrix composites (PMMCs) when subjected to multiaxial cyclic loads are presented and compared. The models are based on the concept of incremental average stress, the endochronic theory of plasticity, and modified forms of the incremental equivalent strain energy density method (ESED) and Neuber's rule. Each model provides a complete set of equations capable of predicting the elastic–plastic strain–stress histories at the Notch Root given a corresponding elastic solution. The preliminary analytical results obtained by applying the formulations to a circumferentially Notched round bar show that each model can independently be used to predict the nonlinear heterogeneous behavior at the Notch Root in PMMC components.
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A comparison between two analytical models that approximate Notch-Root elastic–plastic strain–stress components in two-phase, particle-reinforced, metal matrix composites under multiaxial cyclic loading: Theory
International Journal of Fatigue, 2006Co-Authors: Gbadebo Owolabi, Meera N K SinghAbstract:Abstract In this paper, two analytical models for estimating surface Notch-Root elastic–plastic, strain–stress histories in particulate metal matrix composites (PMMCs) when subjected to multiaxial cyclic loads are presented and compared. The models are based on the concept of incremental average stress, the endochronic theory of plasticity, and modified forms of the incremental equivalent strain energy density method (ESED) and Neuber's rule. Each model provides a complete set of equations capable of predicting the elastic–plastic strain–stress histories at the Notch Root given a corresponding elastic solution. The preliminary analytical results obtained by applying the formulations to a circumferentially Notched round bar show that each model can independently be used to predict the nonlinear heterogeneous behavior at the Notch Root in PMMC components.
