The Experts below are selected from a list of 11376 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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Dynamic fracture toughness of a near alpha titanium alloy Timetal 834
Journal of Alloys and Compounds, 2009Co-Authors: Kartik Prasad, S.v. KamatAbstract:Abstract The dynamic fracture toughness of Timetal 834 alloy under impact loading was evaluated using fatigue pre-cracked specimens and compared with the fracture toughness under static loading condition evaluated in an earlier study. It was found that the dynamic fracture toughness under impact loading was higher than the fracture toughness value under static loading conditions. This behaviour was attributed to the effect of strain rate on strain hardening exponent and yield strength. The effect of notch Root Radius on dynamic fracture toughness of this alloy was also studied. It was found that there exists a critical notch Radius ( ρ 0 ) of ∼150 μm below which the dynamic fracture toughness was independent of notch Root Radius. Above ρ 0 , the dynamic fracture toughness increased linearly with square Root of notch Root Radius.
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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.
Victor Resco De Dios - One of the best experts on this subject based on the ideXlab platform.
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similar diurnal seasonal and annual rhythms in radial Root expansion across two coexisting mediterranean oak species
Tree Physiology, 2020Co-Authors: Josu G Alday, Julio J Camarero, Jesus Revilla, Victor Resco De DiosAbstract:: Dendrometers are being increasingly used to measure stem-Radius changes in trees and to unravel the mechanisms underlying stem daily rhythms of radial expansion and contraction. Nevertheless, automated dendrometers have not been often used to measure Root-Radius dynamics, their relationship with environmental variables, and the influence of endogenous processes, especially in drought-prone Mediterranean areas. Here, we measured Root-Radius dynamics of two coexisting oak species (the evergreen Quercus ilex and the deciduous Quercus faginea). Our goals were to describe annual, seasonal and diurnal scale Root-Radius patterns, and, to disentangle the role of different environmental parameters as drivers. Long-term high-resolution measurements (every 15 minutes over 7 years) were collected with automated point dendrometers on the main tree Roots of five individuals per species. Root-Radius annual change patterns were bimodal and similar for both oak species. Q. faginea showed three times larger Root increment in the spring than Q. ilex, but the bimodal pattern was stronger in Q. ilex which showed a larger Root increment in autumn. Q. faginea showed an earlier Root phenological activation in the spring and in late summer compared with Q. ilex. The effects of environmental drivers across species were similar at daily scales: Root-Radius increased with air temperature and soil moisture and it decreased with rising vapor pressure deficit. Furthermore, daily Root-Radius variations for both oak species were maintained after extracting statistically the environmental effects, which points towards a significant role of endogenous drivers. These differences in Root-Radius change patterns at seasonal to daily scales likely result from the differences in leaf phenology and growth strategy. Q. faginea is deciduous and faster growing rate in spring than the evergreen Q. ilex, which can grow more in summer.
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Similar diurnal, seasonal and annual rhythms in radial Root expansion across two coexisting Mediterranean oak species.
Tree Physiology, 2020Co-Authors: Josu G Alday, Julio J Camarero, Jesus Revilla, Victor Resco De DiosAbstract:Dendrometers are being increasingly used to measure stem Radius changes in trees and to unravel the mechanisms underlying stem daily rhythms of radial expansion and contraction. Nevertheless, automated dendrometers have not been often used to measure Root Radius dynamics, their relationship with environmental variables and the influence of endogenous processes, especially in drought-prone Mediterranean areas. Here, we measured Root Radius dynamics of two coexisting oak species (the evergreen Quercus ilex L. and the deciduous Quercus faginea Lam). Our goals were to describe annual, seasonal and diurnal scale Root Radius patterns and to disentangle the role of different environmental parameters as drivers. Long-term high-resolution measurements (every 15 min over 7 years) were collected with automated point dendrometers on the main tree Roots of five individuals per species. Root Radius annual change patterns were bimodal and similar for both oak species. Quercus faginea Lam showed three times larger Root increment in the spring than Q. ilex, but the bimodal pattern was stronger in Q. ilex, which showed a larger Root increment in autumn. Quercus faginea Lam showed an earlier Root phenological activation in the spring and in late summer compared with Q. ilex. The effects of environmental drivers across species were similar at daily scales: Root Radius increased with air temperature and soil moisture, and it decreased with rising vapor pressure deficit. Furthermore, daily Root Radius variations for both oak species were maintained after extracting statistically the environmental effects, which points toward a significant role of endogenous drivers. These differences in Root Radius change patterns at seasonal to daily scales likely result from the differences in leaf phenology and growth strategy. Quercus faginea Lam is deciduous and has a faster growing rate in spring than the evergreen Q. ilex, which can grow more in summer.
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.
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.
Masataka Nomura - One of the best experts on this subject based on the ideXlab platform.
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true cross sectional area of screw threads with helix and Root Radius geometries taken into consideration
Journal of Pressure Vessel Technology-transactions of The Asme, 2009Co-Authors: Toshimichi Fukuoka, Masataka NomuraAbstract:When evaluating the strength of threaded fasteners under external loads, stress area is commonly used. However, in order to elucidate the mechanical behavior of bolted joints more rigorously and extensively, it is desired to derive an analytical expression of the true cross sectional area of screw threads, with the effects of the helix and Root Radius taken into account. In this paper, a series of closed-form algebraic equations, which can calculate true cross sectional areas of internal and external screw threads, is derived. The equations obtained can be applied to both metric and inch screw threads with a coarse or a fine pitch. Then, the equivalent diameter of the true sectional area is defined and compared with the pitch diameter and stress area diameter.
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analytical expression of true cross sectional area of screw thread with the effects of Root Radius taken into consideration
Transactions of the Japan Society of Mechanical Engineers. C, 2006Co-Authors: Toshimichi Fukuoka, Masataka NomuraAbstract:The cross sectional area of threaded fastener has a complicated configuration due to the helix that characterizes its essential function of tightening structural members. When estimating the strength of threaded fasteners under external loads, the use of “stress area” is recommended in JIS B 0251. It is desired, however, to establish a procedure to calculate the true cross sectional area of screw thread by taking account of the effects of Root Radius in order to elucidate the various mechanical behaviors of bolted joints. In this paper, an analytical expression is presented to calculate the true cross sectional area with simple algebraic equations. Then, its “equivalent diameter” is defined and compared to effective diameter corresponding to the stress area defined in JIS B 0251.
