The effect of inclusions on the high-temperature low-cycle fatigue performance of cast MarBN: Experimental characterisation and computational modelling

2018 ◽  
Vol 41 (11) ◽  
pp. 2288-2304 ◽  
Author(s):  
E.M. O'Hara ◽  
N.M. Harrison ◽  
B.K. Polomski ◽  
R.A. Barrett ◽  
S.B. Leen
Keyword(s):  
High Temperature ◽  
Low Cycle Fatigue ◽  
Computational Modelling ◽  
Fatigue Performance ◽  
Cycle Fatigue ◽  
Experimental Characterisation

High Temperature Low Cycle Fatigue Behaviour of MarBN at 600 °C

2015 ◽  
Author(s):  
Richard A. Barrett ◽  
Eimear O’Hara ◽  
Padraic E. O’Donoghue ◽  
Sean B. Leen
Keyword(s):  
High Temperature ◽  
Low Cycle Fatigue ◽  
Experimental Testing ◽  
Computational Modelling ◽  
Operating Conditions ◽  
Experimental Program ◽  
Limiting Factor ◽  
Cycle Fatigue ◽  
Viscoplastic Material ◽  
Flexible Plant

The changing face of fossil fuel power generation is such that next generation plants must be capable of operating under (i) flexible conditions to accommodate renewal sources of energy and (ii) higher steam pressures and temperatures to improve plant efficiency. These changes result in increased creep and fatigue degradation of plant components. The key limiting factor to achieving more efficient, flexible plant operation is the development of advanced materials capable of operating under such conditions. MarBN is a new precipitate strengthened 9Cr martensitic steel, with added boron and tungsten, designed to provide enhanced creep strength and precipitate stability at high temperature. Accurate characterisation of this material is necessary so that it can be used under flexible plant operating conditions with high temperature fatigue. This paper presents a combined work program of experimental testing and computational modelling on a cast MarBN material. To characterise and assess the fatigue performance of MarBN, an experimental program of high temperature low cycle fatigue (HTLCF) tests is conducted at a temperature of 600 °C. MarBN is found to give an increased stress range compared to previous P91 steel experiments, as well as considerable cyclic softening. To characterise the constitutive behaviour of the cast MarBN material, a recently developed unified cyclic viscoplastic material model is calibrated and validated across a range of strain-rates and strain-ranges, with good correlation achieved with the measured data throughout.

scholarly journals Effect of porosity and eutectics on the high-temperature low-cycle fatigue performance of a nickel-base single-crystal superalloy

2018 ◽  
Vol 155 ◽  
pp. 139-143 ◽  
Author(s):  
Benjamin Ruttert ◽  
Carla Meid ◽  
Lais Mujica Roncery ◽  
Inmaculada Lopez-Galilea ◽  
Marion Bartsch ◽  
...  
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
Low Cycle Fatigue ◽  
Fatigue Performance ◽  
Single Crystal Superalloy ◽  
Cycle Fatigue ◽  
Nickel Base

Fracture Surface in Low Cycle Fatigue of HA-188 Cobalt Base Alloy at High Temperature

1978 ◽  
Vol 27 (292) ◽  
pp. 99-103 ◽  
Author(s):  
Kiyoshi KITA ◽  
Masanori KIYOSHIGE ◽  
Masatake TOMINAGA ◽  
Junzo FUJIOKA
Keyword(s):  
High Temperature ◽  
Fracture Surface ◽  
Base Alloy ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue ◽  
Cobalt Base Alloy ◽  
Cobalt Base

Low-Cycle Fatigue Performance of Buckling Restrained Braces and Assessment of Cumulative Damage under Severe Earthquakes

2018 ◽  
Vol 763 ◽  
pp. 867-874
Author(s):  
Yu Shu Liu ◽  
Ke Peng Chen ◽  
Guo Qiang Li ◽  
Fei Fei Sun
Keyword(s):  
Fatigue Life ◽  
Energy Dissipation ◽  
Structural Reliability ◽  
Low Cycle Fatigue ◽  
Engineering Application ◽  
Fatigue Performance ◽  
Cycle Fatigue ◽  
Variable Amplitude ◽  
Buckling Restrained Braces ◽  
Energy Dissipation Devices

Buckling Restrained Braces (BRBs) are effective energy dissipation devices. The key advantages of BRB are its comparable tensile and compressive behavior and stable energy dissipation capacity. In this paper, low-cycle fatigue performance of domestic BRBs is obtained based on collected experimental data under constant and variable amplitude loadings. The results show that the relationship between fatigue life and strain amplitude satisfies the Mason-Coffin equation. By adopting theory of structural reliability, this paper presents several allowable fatigue life curves with different confidential levels. Besides, Palmgren-Miner method was used for calculating BRB cumulative damages. An allowable damage factor with 95% confidential level is put forward for assessing damage under variable amplitude fatigue. In addition, this paper presents an empirical criterion with rain flow algorithm, which may be used to predict the fracture of BRBs under severe earthquakes and provide theory and method for their engineering application. Finally, the conclusions of the paper were vilified through precise yet conservative prediction of the fatigue failure of BRB.

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