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Author: Saghana B. Chakrabortty Publisher: ISBN: Category : Languages : en Pages : 37
Book Description
The fatigue crack propagation behavior of three titanium-vanadium alloys (24, 28 and 32 wt.% V) which have (tensile) deformation modes ranging from coarse twinning to wavy and planar slip has been measured in laboratory air and correlated with their low cycle fatigue properties and microstructure. The fatigue crack growth rate of alloys with similar microstructures but different deformation modes, and of alloys with similar deformation modes but different microstructures have been compared. Increasing the deformation barrier mean free path and improving low cycle fatigue properties has been observed to reduce the fatigue crack growth rate at low and intermediate Delta K levels. The fatigue crack growth data have been compared with that calculated from equations which use microstructure and low cycle fatigue parameters. The predictive capability of these equations which contain only measurable parameters has been found to be quite adequate. (Author).
Author: Saghana B. Chakrabortty Publisher: ISBN: Category : Languages : en Pages : 37
Book Description
The fatigue crack propagation behavior of three titanium-vanadium alloys (24, 28 and 32 wt.% V) which have (tensile) deformation modes ranging from coarse twinning to wavy and planar slip has been measured in laboratory air and correlated with their low cycle fatigue properties and microstructure. The fatigue crack growth rate of alloys with similar microstructures but different deformation modes, and of alloys with similar deformation modes but different microstructures have been compared. Increasing the deformation barrier mean free path and improving low cycle fatigue properties has been observed to reduce the fatigue crack growth rate at low and intermediate Delta K levels. The fatigue crack growth data have been compared with that calculated from equations which use microstructure and low cycle fatigue parameters. The predictive capability of these equations which contain only measurable parameters has been found to be quite adequate. (Author).
Author: Eui Whee Lee Publisher: ISBN: Category : Languages : en Pages : 39
Book Description
The crack retardation response due to single- and multiple-cycle overload of two titanium vanadium alloys (24 and 32 wt. pct. V) has been studied. It has been observed that the degree of retardation depends upon the vanadium content of the alloy, the load ratio, the number of overload cycles and the magnitude of the peak load. Fractographic observations show that the cracking mode may be changed in the overload affected zone from that in the preoverload region. These results seem to incidcate that the retardation behavior is mainly due to the compressive residual stresses arising as a consequence of the overload. The degree of retardation depends not only on the loading variables, but also on the material parameters like the monotonic and cyclic deformation behavior, and the stress-strain response. (Author).
Author: A. Raith Publisher: ISBN: Category : Titanium alloys Languages : en Pages : 68
Book Description
The fatigue crack growth rate tests of water quenched Corona-5 (Ti-4.5Al-1.5Cr-5Mo) and Ti-6Al-4V alloy were conducted in air at room temperature. The effect of the presence of the metastable retained beta phase on the fatigue crack growth rate was examined in this research. The specimens were heat treated and water quenched to have unstable beta phase that could be transformed to martensite during the fatigue crack growth testing. As quenched specimens were compared with specimens in the mill annealed condition. The fatigue crack growth rates of all the specimens were in the same order of magnitude regardless of the heat treatment. From this research it was shown that in Corona-5 and Ti-6Al-4V alloys the fatigue crack growth rates were not affected by the strain induced martensitic transformation.
Author: Russell Wanhill Publisher: Springer Science & Business Media ISBN: 9400725248 Category : Technology & Engineering Languages : en Pages : 58
Book Description
This publication reviews most of the available literature on the fatigue properties of β annealed Ti-6Al-4V and titanium alloys with similar microstructures. The focus is on β processed and β heat-treated alloys because β annealed Ti-6Al-4V has been selected for highly loaded and fatigue-critical structures, including the main wing-carry-through bulkheads and vertical tail stubs, of advanced high-performance military aircraft. An important aspect of the review is a concise survey of fatigue life assessment methods and the required types of fatigue data. This survey provides the background to recommendations for further research, especially on the fatigue behaviour of β annealed Ti-6Al-4V under realistic fatigue load histories, including the essential topic of short/small fatigue crack growth. Such research is required for independent fatigue life assessments that conform to the aircraft manufacturer’s design requirements, and also for life reassessments that most probably will have to be made during the service life of the aircraft.
Author: Publisher: ISBN: Category : Languages : en Pages : 37
Book Description
The influence of microstructure, slip behavior, and gaseous environment on the fatique crack propagation of Ti alloys has been investigated. Large grain or single crystal material has been used extensively in order to ensure that the crack-tip plasticity is smaller than the scale of the microstructure. As a result, extensive Stage I crack propagation occurs. The experimental relationships between crack-tip plasticity, orientation of the crack plane to the stress axis, fractography, and the resulting fatigue crack growth behavior is presented. Several Ti alloys are examined in lab air, dry helium, or hydrogen environments: beta-phase Ti-40V, metastable beta Ti-27V, and Ti-30V, alpha-phase Ti-4Al, and the alpha-beta alloy, Ti-8Al-1Mo-lV. The behavior of the beta Ti alloys can be analyzed primarily in terms of crack advance by an intersecting slip process resulting from flow on at least two active slip systems. In contrast, the mechanism for Stage I fatigue in alpha and alpha + beta Ti alloys appears to be dominated by basal slip and strongly influenced by environment. Aspects of the cyclic stress-strain behavior of beta and alpha + beta Ti alloys are also reported. In addition, strengthening of Ti alloys by eutectoid decomposition is briefly discussed. (Author).
Author: National Aeronautics and Space Administration (NASA) Publisher: Createspace Independent Publishing Platform ISBN: 9781721017546 Category : Languages : en Pages : 32
Book Description
To study the effects of atmospheric species on the fatigue crack growth behavior of an a+B titanium alloy (Ti 6-2-2-2-2) at room temperature and 177 C, fatigue tests were performed in laboratory air, ultrahigh vacuum, and high purity water vapor, oxygen, nitrogen and helium at various partial pressures. Accelerated fatigue crack growth rates in laboratory air compared to ultrahigh vacuum are linked to the damaging effects of both water vapor and oxygen. Observations of the fatigue crack growth behavior in ultrahigh purity environments, along with surface film analysis using X-ray photoelectron spectroscopy (XPS), suggest that multiple crack-tip processes govern the damaging effects of air. Three possible mechanisms are proposed: 1) at low pressure (less than 10(exp -1) Pa), accelerated da/dN is likely due to monolayer adsorption on crack-tip surfaces presumably resulting in decreased bond strengths at the fatigue crack tip, 2) for pressures greater than 10(exp -1) Pa, accelerated da/dN in oxygen may result from oxidation at the crack tip limiting reversible slip, and 3) in water vapor, absorption of atomic hydrogen at the reactive crack tip resulting in process zone embrittlement.Smith, Stephen W. and Piascik, Robert S.Langley Research CenterFATIGUE TESTS; FATIGUE (MATERIALS); CRACK PROPAGATION; TITANIUM ALLOYS; EMBRITTLEMENT; ATMOSPHERIC COMPOSITION; X RAY SPECTROSCOPY; WATER VAPOR; ULTRAHIGH VACUUM; PHOTOELECTRON SPECTROSCOPY
Author: Saghana B. Chakrabortty
Author: Saghana B. Chakrabortty
Author: Eui Whee Lee
Author: Eui Whee Lee
Author: A. Raith
Author: Russell Wanhill
Author: R. G. Broadwell
Author: 
Author: C. M. Hudson
Author: National Aeronautics and Space Administration (NASA)
Author: Ahmed Abada