scholarly journals Prediction of Matrix Fatigue Crack Initiation in Notched SCS-6/Ti-15-3 Metal Matrix Composites

1992 ◽  
Vol 14 (4) ◽  
pp. 221 ◽  
Author(s):  
WS Johnson ◽  
JE Masters ◽  
T Kevin O'Brien ◽  
BM Hillberry ◽  
W Steven Johnson
Keyword(s):  
Fatigue Crack ◽  
Crack Initiation ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Fatigue Crack Initiation ◽  
Matrix Composites

scholarly journals A New Model for Predicting Low Cycle Fatigue Behavior of Discontinuously Reinforced Metal Matrix Composites

2021 ◽  
Author(s):  
Qian Zhang
Keyword(s):  
Particle Size ◽  
Crack Initiation ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Volume Fraction ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Plastic Strain Amplitude ◽  
Strain Hardening Exponent ◽  
Matrix Composites

An analytical model for predicitng the crack inititation life of low cycle fatique (LCF) of discontinuously reinforced metal matrix composites (DR-MMCs) has been proposed. The effects of the volume fraction Vf cyclic strain hardening exponent n' and cyclic strength coefficient K' on the LCF crack initiation life of DR-MMCs were analyzed. While both the lower level of the plastic strain amplitude and the lower Vf were found to increase the LCF crack initiation resistance, the effects of n' and K' were more complicated. By considering the enhanced dislocation density in the matrix and the load bearing effect of particles, a quantitative relationship between the LCF life of DR-MMCs and particle size was also derived. This model showed that a decreasing particle size results in a longer LCF life. The theoretical predictions based on the proposed models were found to be in good agreement with the experimental data reported in the literature.

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