Time-dependent fatigue damage model under uniaxial and multiaxial loading at elevated temperature

Influence of Asymmetrical Waveform on Low-Cycle Fatigue Life of Micro Solder Joint

“…[6][7][8][9] Plastic strain primarily damages the grain interior, whereas creep strain primarily damages the grain boundaries in the polycrystalline state. In high-temperature low-cycle tension-compression fatigue tests performed on conventional specimens of SUS304 steel by Taira et al, hightemperature low-cycle fatigue using symmetrical triangular waves caused grain boundary sliding; however, almost no residual grain boundary sliding remained at the end of a cycle since the grain boundaries slid in a reversible manner during the tension-compression process.…”

“…Isothermal fatigue tests using asymmetrical triangular strain waveforms that take into account the asymmetrical nature of strain components in temperature cycles have been performed primarily in the area of structural materials. [6][7][8] For example, Taira et al found in hightemperature low-cycle fatigue for low-carbon steel (S15C) and stainless steel (SUS304) that fatigue life under asymmetrical triangular strain waveforms was shorter than that under symmetrical triangular strain waveforms. 9 Studies using large specimens of the Sn-Ag-Cu alloy have also shown that fatigue life under asymmetrical waveforms was shorter than that under symmetrical waveforms.…”

A New Ductility Exhaustion Model for High Temperature Low Cycle Fatigue Life Prediction of Turbine Disk Alloys

“…Over the past several decades, the issue of accurately predicting HTLCF life of these hot section components has been an area of interest. Many life prediction methods have been reported [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. However because of the complex damaging mechanisms involved, a unified model that can provide accurate life prediction for HTLCF does not exist [1].…”

“…They depend on various test and material parameters, such as temperature, stress or strain rate, loading frequency and loading waveform. Several researchers have reported the influence of the cyclic frequency [2], hold period [3], strain range [4], loading waveform [5], strain rate [6,7], heat treatment [8], testing temperature [9] and environment [10,11] on the cyclic stress response, deformation mode, and fatigue life of superalloys during HTLCF. Increasing attention has been paid to the study of fatigue and creep interaction in either isothermal or thermal-mechanical fatigue conditions [12].…”

“…When using this model, the predicted lives had good agreement with the observed ones in tests when DE was the dominant mechanism. Recently, Shang et al [7,18] developed two models for life prediction considering fatigue-creep interaction. One model uses the linear damage rule to predict the life of continuous cyclic loading at elevated temperature [18].…”