An improved Corten-Dolan’s model based on damage and stress state effects

Abstract

The value of exponent d in Corten-Dolan's model is generally considered to be a constant. Nonetheless, the results predicted on the basis of this statement deviate significantly from the real values. In consideration of the effects of damage and stress state on fatigue life prediction, Corten-Dolan's model is improved by redefining the exponent d used in the traditional model. The improved model performs better than the traditional one with respect to the demonstration of a fatigue failure mechanism. Predictions of fatigue life on the basis of investigations into three metallic specimens indicate that the errors caused by the improved model are significantly smaller than those induced by the traditional model. Meanwhile, predictions derived according to the improved model fall into a narrower dispersion zone than those made as per Miner's rule and the traditional model. This finding suggests that the proposed model improves the life prediction accuracy of the other two models. The predictions obtained using the improved Corten-Dolan's model differ slightly from those derived according to a model proposed in previous literature; a few life predictions obtained on the basis of the former are more accurate than those derived according to the latter. Therefore, the improved model proposed in this paper is proven to be rational and reliable given the proven validity of the existing model. Therefore, the improved model can be feasibly and credibly applied to damage accumulation and fatigue life prediction to some extent.

A Review on Fatigue Life Prediction Methods for Metals

“…Other interesting theories accounting for load interaction effects can be found in literature [113][114][115][116][117][118][119][120][121][122].…”

Total fatigue life prediction for welded joints based on initial and equivalent crack size determination

“…According to the procedure in “Procedure of total fatigue life prediction based on initial crack size determination” section, which is based on the proposed method for initial crack size determination, propagation life of 16Mn steel welded joints can be obtained when finial crack size a f is determined. As previously mentioned, life prediction accuracy is tightly related to initial crack size ap0 and relatively unaffected by a f (Gao et al., 2015). In recent investigations, the determination of a f is in connection with the thickness of specimen.…”

“…In recent investigations, the determination of a f is in connection with the thickness of specimen. One-third, one-half, and the whole of thickness are often taken as the finial crack size (Gao et al., 2015; Lassen, 1990; Zhang, 2013), and one-third of thickness is taken in this paper to predict propagation life. Thus, deterministic total fatigue life of 16Mn steel welded joints can be calculated according to the proposed procedure, through summing initiation life and propagation life.…”

“…In engineering, two approaches are widely used to predict fatigue life of mechanical structures: the S–N curve of materials combined with the damage accumulation theory-based approach; the fracture mechanics and crack growth curve-based approach (Al-Mukhtar et al., 2010; Berto and Ayatollahi, 2011; Gao et al., 2015; Lazzarin et al., 2014; Liu and Mahadevan, 2009; Lv et al., 2015; Pook et al., 2014). The second approach can be classified into two categories: linear elastic fracture mechanics (LEFM) and elastic–plastic fracture mechanics (EPFM).…”

The effect of adhesive failure and defects on the stress distribution in all-ceramic crowns

“…According to the fatigue theory [62], the stress level is positively correlated with  and σmax. Moreover, According to Corten-Dolan's cumulative damage model [63][64][65], fatigue damage D after N cycles of fatigue load is estimated by the following equation…”