Influence of High Temperature Elastic-Plastic Small Crack Growth
Influence of High Temperature Elastic-Plastic Small Crack Growth. Behavior in a Nickel-Base Superalloy on the Life Prediction of. Structural Components.
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HIGH TEMPERATURE ELASTIC-PLASTIC SMALL CRACK
Jul 2, 1993 ... elastic-plastic crack growth behavior of this material. They did not find any ... Under room temperature and high temperature conditions, the small. 509 ..... The influence of crack tip plasticity was investigated in this study using ...
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high-temperature cyclic fatigue-crack growth behavior in an in situ
Abstract The growth of fatigue cracks at elevated temperatures (25–1300°C) is ... crack-monitoring technique, adapted for use on ceramics at high temperatures. ..... small-scale creep conditions, as described in .... Influence of loading frequency (3–1000 Hz) on cyc- ...... Engineering Approach for Elastic-Plastic Fracture.
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Fatigue-Crack Growth Behavior in the Superelastic and Shape
This article presents a study of fatigue-crack propagation behavior in Nitinol, ... transformation of the superelastic austenite structure, which occurs readily at .... in grain size; instead, there are clusters of small grains, as shown in (a) and .... At high enough temperatures (i.e., T ... ture as the fatigue-crack growth temperature.
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Crack Growth - eFatigue
To make life estimations for fatigue crack growth and ... linear elastic fracture mechanics (LEFM), ... Based on energy balance of a cracked body for ideally brittle behavior ... Irwin applied Griffith's theory to metals with small plastic ..... temperature, strain rate, environment, and thickness. ... Thin parts have a high value of K.
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The Study of Overload Effects on Fatigue-Crack-Growth Behavior by
During the load-controlled high-cycle fatigue test, when the overload was .... 1.3 Elastic and elastic-plastic crack-tip-stress distributions in front of the .... Vogt et al. examines the effect of nitrogen and temperature on the fatigue behav- ... ize the creep-crack-growth behavior under conditions ranging from the small-scale.
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Influence of Frequency on the High-Temperature Fatigue Crack
The influence of frequency on fatigue crack growth (FCG) behavior was investigated for three differently ... Keywords: frequency, 17-4 PH stainless steel, fatigue crack growth, high temperature. 1. .... Elastic Modulus .... mechanism called the ''plastic blunting process''23) in which .... which small, coherent precipitates formed.
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Crack Initiation and Crack Growth Behavior of Carbon and - OSTI
Results of fatigue tests that examine the influence of reactor environment ... on fatigue crack growth behavior of carbon and low-alloy steels in LWR ..... For the tests in high-temperature water, crack growth characteristics were determined .... where E is the elastic modulus, cp is nominal plastic strain, and a is crack depth.
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ANALYSES OF FATIGUE AND FATIGUE-CRACK GROWTH UNDER
by crack shape (surface or corner cracks), enhanced crack-tip plastic strains due to ... deceleration of small cracks when compared to large-crack growth behavior. ... A probabilistic analysis would be required to assess the influence of the .... The linear-elastic effective stress-intensity factor range developed by Elber  is.
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THE INFLUENCE OF SPECIMEN GEOMETRY ON STABLE CRACK
KEYWORDS. Fracture properties; stable crack growth; R—curves; elastic-plastic ... cept to elastic—plastic material behaviour by using yielding fracture mechanics ... remelted high strength steel BOCrNiMoB having a room temperature yield strength of 850 .... growth. For small Aaeff—values the scatterband of the KR— daeff.
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The Influence of Porosity on Short Fatigue Crack Growth at Large
vs. interconnected) on short crack growth behavior during low cycle fatigue has been ... nature of the plastic zones which provide a high strain amplitude propagation ... materials, or (b) readily initiate voids at small plastic strains such as at a weak .... titanium as measured by under linear elastic fracture mechanic conditions.(.
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Time-Dependent Crack Growth in a Heat-Resistant Alloy Inconel 617
proved that Ni-Cr-Co alloys have good high temperature strength, creep ... the cyclic fatigue behavior and creep crack growth rate of lnconel 617 alloy ... Eventually, the influence of time-dependent processes on crack growth rate ... when the R-ratio is small and frequency is ... use of linear-elastic mechanics techniques for.
[ 18811248.1993.9734487 - Read/Download File
Influence of mean stress on ti6a14v fatigue crack growth at very high
Influence of mean stress on ti6a14v fatigue crack growth at very high frequency ... The present study deals with the fracture mechanics behaviour of a titanium ... crack growth (FCG) rates of Ti6A14V at high frequency at room temperature and with ... also submitted to small elastic vibration cycles at very high frequency due to ...
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Crack growth behavior of low-alloy bainitic 51CrV4 steel
However, the influence of stresses superimposed during the bainitic ... Especially during forging, high temperature and stress gradients are prevalent, eliminating ... For this paper, a bainitic microstructure was induced in an elastically loaded ... growth behavior, such that the crack growth took place faster due to small cracks ...
[ 1-s2.0-S1877705810001505-main.pdf?_tid=0b8009e2-e9b4-11e3-b8f9-00000aab0f26&acdnat=1401644704_e7a57fcc0fdfaade07a804d170fddf93 - Read/Download File
Creep and creep–fatigue crack growth - Springer
Feb 17, 2015 ... vated temperature crack growth in creep-brittle materi- als used in gas ... ments such as high temperatures and stresses are com- ..... region of influence of growing crack fields are small .... and that due to change in elastic ( ˙Ve) and plastic ( ˙Vp) .... 5 Fatigue crack growth behavior at of a 1Cr–1Mo–0.25V.
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Effects of temperature and frequency on fatigue crack growth in 18
The fatigue crack growth behaviour of a ferritic stainless steel has been investigated as a function ... Key words: high-temperature fatigue; embrittlement; frequency effects; creep-fatigue interactions ... a previous study 2 we reported on the influence of temperature ..... a decrease in the magnitude of the elastic modulus E with.
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THE FATIGUE BEHAVIOR OF SMALL CRACKS IN AIRCRAFT
The alloys and test temperatures were: Waspaloy (427C),. Inconel 718 ... performed in load control for Waspaloy and Inconel 718 under high stress (max < 0 .9ays) elastic ... Small crack growth rates under elastic-plastic fatigue conditions in powder metallurgy ...... factors which have been shown to influence this problem.
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High temperature fatigue crack propagation behaviour of - DiVA
Paper III: Influence of high temperature hold times on the fatigue crack propagation in ... Paper VI: High temperature fatigue crack growth behaviour of Inconel .... combustor where it is mixed with fuel and ignited, while a small amount of it is ..... linear part (elastic region) in the initial loading is much larger than the visibly.
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Fracture Mechanics - Materials Technology - TU/e
Sep 6, 2012 ... 2.2 Ductile - brittle behavior . ... 5.3 Linear elastic material behavior . .... 9.5 Influence of the plate thickness . ..... The crack growth criterion can also be based on the stress state at the crack ... In Elastic-Plastic Fracture Mechanics (EPFM) or Non-Linear ... prohibited due to low temperature or high strain rate.
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Creep-Fatigue Crack Growth Behavior in an Ex-service Cr-Mo-V
Figure 1: Compact type (CT) creep-fatigue crack growth specimen geometry ...33. Figure 2: ... Figure 8: The influence of specimen location (Bore and Rim) on the ... When elastic-plastic-primary creep-secondary creep deformation model was ... of highly stressed components operating at high temperatures in power plants.
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