Fatigue life prediction for notched specimen considering modified critical plane method

Abstract

To meet the different functional requirements of the components, irregularities and geometric discontinuities occur in the structural design of the components. These geometrical discontinuities lead to local stress concentrations, which inevitably introduce notch effects. The unyielding internal material still supports the high‐stress area on the plane due to the supporting effect of the notch. This effect can lead to inaccurate prediction of fatigue life. So, the notch support factor and strain were used as damage parameters to modify the life prediction model of the notched specimens in this research. And an improved critical plane method is applied in selecting damaged planes. It considers the damage at the notch before loading and uses dynamic weights to measure the effect of the maximum stress plane on the damaged plane. The model was validated using TC4 and GH4169 notch data and compared with other models, and the revised model has higher accuracy. The damaged plane and damage parameters to modify the fatigue life of the notched specimen make more physical sense and are more consistent with the fatigue failure mechanism.

Study on mechanical properties and fracture modes of sandstone with cracks under triaxial compression

“…14,15 Given the impact of stress on the stability and safety of engineering structures under load, it is important to conduct detailed studies on crack propagation. [16][17][18][19] This study investigated the mechanical properties of rocks with varying crack lengths and dip angles through indoor uniaxial compression tests. The results revealed the relationship between mechanical parameters and crack dip angles.…”

“…The extension of these cracks is related to the stress intensity factor (SIF) and can be studied through experimental, theoretical, and numerical methods, with analytical methods being widely used 14,15 . Given the impact of stress on the stability and safety of engineering structures under load, it is important to conduct detailed studies on crack propagation 16–19 . This study investigated the mechanical properties of rocks with varying crack lengths and dip angles through indoor uniaxial compression tests.…”

Critical Plane Methodology for Intelligent Prediction of Fretting Fatigue Lifetime Based on Shear Strain Dynamics

“…The universality of fretting fatigue and the seriousness of its harm have attracted the attention of researchers worldwide, and the prediction of fatigue life has become a research hotspot [2][3][4][5][6][7][8][9][10].…”