Christopher Hyde's research while affiliated with University of Nottingham and other places
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Publications (6)
Polycrystalline nickel-based superalloys tend to have large grains within component areas where high loads are dominant during operation. Due to these large grains, caused by the manufacturing and cooling process, the orientation of each grain becomes highly important, since it influences the elastic and plastic behaviour of the material. With the...
For critical component application, such as aerospace turbine rotors, it is imperative to be able to make accurate in-service material behaviour and component life predictions for both design and monitoring of component life. The development of such predictive capability is dependent on the quality of the experimental data from which the material p...
Small specimen mechanical testing is an exciting and rapidly developing field in which fundamental deformation behaviours can be observed from experiments performed on comparatively small amounts of material. These methods are particularly useful when there is limited source material to facilitate a sufficient number of standard specimen tests, if...
The current paper describes TMF crack growth behaviour in an advanced nickel-based superalloy. Changes in behaviour are examined which occur as a function of the phase angle between applied stress and temperature. The fractography of the failed specimens reveals changes from transgranular to intergranular growth between high and low phase angle tes...
Crack size determination using electrical potentials both in service and in the laboratory has been undertaken for many years. In the laboratory this has mainly concentrated on the measurement of crack depth, with either alternating current (AC) or direct current (DC) supplies. Some work to determine the varying depth along the width of cracks as a...
A fatigue crack initiation model based on damage accumulation via a fatigue memory surface in conjunction with a plastic strain energy parameter was evaluated for thermomechanical fatigue loading in a gas turbine disc alloy. The accumulated damage in each hysteresis loop was summed up, and it was assumed that the damage at the stable state is repea...
Citations
... ) for a given activated slip is the following (Eq. 26) [40]: ...
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... However, the Basquin model has some limitations. Firstly, the model assumes a linear relationship between the maximum stress and the number of fatigue cycles, and the S-N curve can neither be extrapolated from the finite life region to the high-cycle fatigue life region, nor can it be used to estimate the fatigue limit of materials [14][15][16][17]. In addition, the model can only be used for estimation within the experimental range. ...
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... Conventional uniaxial tensile tests ask for destructive sampling [4] , and thus cannot be applied to in-service DMWs. ...
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... [1][2][3][4][5][6][7][8][9] Moreover, the amount of these damages will change with the change of material type or loading path, which seriously affects the failure life of hightemperature equipment. [10][11][12] At present, modern aeroengines continue to pursue high thrust weight ratio, and their service reliability and safety need to be guaranteed; therefore, damage calculation and life assessment for MTMF have become a new hot issue. ...
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... The introduction of the memory surface concept, which is analogous to the yield surface in plasticity and was first communicated in cyclic plasticity [9], gives the opportunity to follow the cumulative fatigue damage evolution based on the present stress-strain state throughout the loading sequence. This approach has been adopted for several conditions, e.g., as a fatigue criterion for general multiaxial loading [10] and for thermomechanical fatigue conditions [11]. This concept has also been adopted for HCF load conditions in the Ottosen-Stenström-Ristinmaa (OSR) incremental fatigue damage model [12]. ...
