Cyclic behaviour concerning the response of material subjected to tension levelling

Morris, J. W.; Hardy, Stephen; Lees, Arthur W.; Thomas, Jimmy

doi:10.1016/s0142-1123(99)00120-6

Cited by 8 publications

(2 citation statements)

References 5 publications

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“…At ∆ε t /2 = ±0.3 % and ∆ε t /2 = ±0.5 %, the maximum stress developed at RT while at ∆ε t /2 = ±0.8 %, the maximum stress developed at 700° C. The gap between cyclic stress response at RT and 400° C goes on reducing with increase in strain amplitude and at ∆ε t /2 = ±0.8 %, it reduces to zero, following the same curve indicating no significant effect of increased strain. According to Moris et al [8], Bauschinger ratio 'φ' has been computed using Eq. ( 2) which is expressed as ( ) ( )…”

Section: Cyclic Stress Responsementioning

confidence: 99%

Low Cycle Fatigue Behaviour of a Turbine Blade Made of Nickel Base Wrought Alloy

Sahoo

Panigrahi

2014

AMR

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Life of an aero-engine is limited by the life of the turbine blade in particular and that of hot end components in general. Design of aero-engine is always conservative in nature considering the flight safety as paramount important. Earlier engines have been assigned life in hours but the life of the component is limited by LCF cycles particularly during the start-stop cycles. In this paper LCF behaviour of a typical Russian origin nickel base wrought super alloy AP220BD used for turbine blade has been studied at room temperature (RT), 400 °C and 700 °C that corresponds to idle rating and cruise rating of a typical aero-engine. Low cycle fatigue (LCF) tests have been carried out at RT, 400°C and 700 °C at three strain amplitudes of ±0.3%, ±0.5% and ±0.8%. Hysteresis loop have been developed at each strain and temperature. It has been observed that LCF life of the nickel base wrought alloy AP220BD is not influenced significantly at strain amplitude of ±0.3% till it reaches 400° C. Reduction in LCF life with increase in strain amplitude from ±0.3% to ±0.8% is much significant compared to that of increase in temperature up to 700°c.The higher life at intermediate strain of ±0.5% may be due to DSA(dynamic strain aging) of the material. Transgranular fracture has been observed at RT & 400° C while intergranular fracture at 700° C.

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Section: Cyclic Stress Responsementioning

confidence: 99%

Low Cycle Fatigue Behaviour of a Turbine Blade Made of Nickel Base Wrought Alloy

Sahoo

Panigrahi

2014

AMR

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“…Lees, J.T. Thomas [2] consider that the loading system of the process leads to a corresponding very low cycle fatigue stress-strain history being applied to surface and sub-surface sections of the material. The results reported here suggest that a mixed mode work hardening process is present, with the application of a Bauschinger effect resulting in a closed hysteresis loop on completion of the first cycle.…”

Section: Introductionmentioning

confidence: 99%

Leveling Quality Prediction Algorithm

Maier

Gauthier

2015

AMM

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Roller leveling is a forming process which used to minimize flatness imperfection and residual stresses by repeated forming process of a sheet metal. The determination of the machine settings must be very accurate and ask a precise mechanical study. In order to determine an algorithm which can predict the leveling quality according to the machine settings we start by a theoretical model of stress evolution during the process. The plastification ratio is deducted from this one and the values obtained by this approach are compared whit experimental values. The finite element analysis is performed, in second step in order to assure a good accuracy of the prediction algorithm. Theoretical study determines a minimum of the plastification ratio according to the machine settings. The finite element analysis gives more accurate results due to the consideration of different characteristics of the process, neglected by the theoretical model: cumulative effect of bending/unbending with stretching of the sheet during the passing between each couple of rolls, boundary conditions at the limit of the material deformed by two adjoining couples of rolls, friction force.

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Computational analysis of the curvature distribution and power losses of metal strip in tension levellers

Steinwender

Kainz

Krimpelstätter

et al. 2010

IOP Conf. Ser.: Mater. Sci. Eng.

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Cyclic behaviour concerning the response of material subjected to tension levelling

Cited by 8 publications

References 5 publications

Low Cycle Fatigue Behaviour of a Turbine Blade Made of Nickel Base Wrought Alloy

Low Cycle Fatigue Behaviour of a Turbine Blade Made of Nickel Base Wrought Alloy

Leveling Quality Prediction Algorithm

Computational analysis of the curvature distribution and power losses of metal strip in tension levellers

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