A fracture mechanics approach to high temperature fatigue crack growth in Udimet 700

Sadananda, K.; Shahinian, P.

doi:10.1016/0013-7944(79)90031-6

Cited by 41 publications

(16 citation statements)

References 16 publications

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“…Shahinian [ 18] for fatigue crack growth behaviour of Udimet 700 at 850°C. Each new hysteresis loop was considered independently of previous deformation history which could be done if material ahead of the crack were cyclically stable.…”

Section: Fatigue Crack Growth At Large Plastic Strainsmentioning

confidence: 99%

“…The method used involved reduction of the order of the equation by putting (20) Elasto-Plastic Fatigue Crack Growth Equation (18) then becomes:…”

Section: (I) Geometry Of Double Cantilever Beammentioning

confidence: 99%

“…Numerical methods were applied to integrate the second order differential equation (18). The method used involved reduction of the order of the equation by putting (20) Elasto-Plastic Fatigue Crack Growth Equation (18) then becomes:…”

Section: (I) Geometry Of Double Cantilever Beammentioning

confidence: 99%

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Elasto-Plastic Fatigue Crack Growth: Mathematical Models and Experimental Evidence

Radon

1990

Nonlinear Fracture Mechanics

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This paper d~~bes some analytical models developed for the evaluation of the cyclic J•integral, ~J. The J-integral is usually obtained through involved graphical procedures with experimental load-load point displacement plots. Numerical and other procedures are even more time consuming. For typical specimens, such as C(T), TPB and DCB (double cantilever beam) the graphical procedures are much simpl~r.An easily applicable analytical formula for the cyclic J-integral, by means of which the integral could be calculated and which would be comprehensive enough to be applicable for the conditions of fatigue and creep would be particularly helpful~

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Section: Fatigue Crack Growth At Large Plastic Strainsmentioning

confidence: 99%

“…The method used involved reduction of the order of the equation by putting (20) Elasto-Plastic Fatigue Crack Growth Equation (18) then becomes:…”

Section: (I) Geometry Of Double Cantilever Beammentioning

confidence: 99%

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Elasto-Plastic Fatigue Crack Growth: Mathematical Models and Experimental Evidence

Radon

1990

Nonlinear Fracture Mechanics

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“…The curve in Figure 38 While Equation 24 provides an adequate description of the baseline data shown in Figure 38a, it does not describe the trend in the RHC test crack growth rate data at all. Only one RHC test (RHC-5) yielded load-displacement data which was considered sufficiently valid for J-integral analysis, i.e., the displacements were measured either directly across the hole at a 4.0 inch gage length.…”

Section: Experimental Elastic-plastic Parameter Correlationsmentioning

confidence: 99%

The Application of a Nonlinear Fracture Mechanics Parameter to Ductile Fatigue Crack Growth

Hartman¹,

Rajendran²,

Dawicke³

1982

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“…Jintegral concept [19][20][21][22] has been developed as alternative parameter to characterize the crack growth behavior in conditions where the non-linear effects and plastic flow around the crack tip are extensive to alter the crack tip region characteristics and the linear elastic fracture mechanics concepts are invalid. Crack growth behavior under high temperature fatigue using the J-integral concept has been studied considering the superimposed non-linear effects at elevated temperatures such as time dependent creep damage and environmental effects where the linear elastic concepts could be violated at the crack tip region [23]. The J-Integral method can be employed in both linear and non-linear elastic regimes to evaluate the elastic and plastic work fields around the crack tip and the crack growth.…”

Section: Fracture Mechanicsmentioning

confidence: 99%

Life Assessment by Fracture Mechanics Analysis and Damage Monitoring Technique on Combustion Liners

Altunlu

Hoogt

Boer

2011

Volume 6: Structures and Dynamics, Parts a and B

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A methodology has been developed and tested including a multi-disciplinary framework towards integrated analysis of gas turbine combustors. The sub-elements consist of combustion dynamics, stress and modal analysis, fracture mechanics and structural health monitoring have been interlinked indicating the damage evaluation to life assessment. The interaction between the interrelated combustion driven flame dynamics, acoustic pressure fluctuations and liner wall vibration has been investigated in the laboratory combustor test system. During the operation, the combustion, acoustics and wall vibrations have been coupled together. The dynamic combustion process generates high amplitude pressure oscillations resulting in vibration of the liner structure at about constant elevated temperature in base load operation. The thermo-acoustic instabilities have a significant destructive impact on the life of the liner material due to high cyclic vibration levels at high temperature.A structural health monitoring (SHM) method has been established to identify the damage, detect the flaw existence and determine the location, severity and progress of the damage for the combustion liners. Vibration-based and acoustic emission (AE) techniques have been applied in the test system to assess the structural behavior. The applicability of the technique has been tested by examining the dynamic modal parameters of the structure. The method enables a reliable assessment on the liner specimen at elevated temperatures by means of non-destructive evaluation under continuous operation of the combustor. The combustion liner specimen material has been assessed by calculating the near-tip fields at the crack tip by finite element based stress and fracture mechanics analysis. An algorithm based on J-Integral has been utilized to analyze the crack growth behavior under various loading conditions considering both linear and non-linear elastic fracture mechanics concepts. The location and the direction of the cracking on the liner specimen have been predicted. The presented work interrelates the different mechanisms in gas turbine combustors and the applicability of the concepts has been verified and validated in the test systems.

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A fracture mechanics approach to high temperature fatigue crack growth in Udimet 700

Cited by 41 publications

References 16 publications

Elasto-Plastic Fatigue Crack Growth: Mathematical Models and Experimental Evidence

Elasto-Plastic Fatigue Crack Growth: Mathematical Models and Experimental Evidence

The Application of a Nonlinear Fracture Mechanics Parameter to Ductile Fatigue Crack Growth

Life Assessment by Fracture Mechanics Analysis and Damage Monitoring Technique on Combustion Liners

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