Crack precursor size for natural rubber inferred from relaxing and non-relaxing fatigue experiments

•Fatigue life prediction of a dumbbell cylindrical rubber component was performed.•Fatigue life and normal direction angle of crack growth plane were obtained.•We establish the relation between exponent F and R ratio in Mars–Fatemi model.•Fluctuation of fatigue life is due to the crack precursor siz...

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Bibliographic Details
Published in:International journal of fatigue 2015-11, Vol.80, p.50-57
Main Authors: Li, Fanzhu, Liu, Jinpeng, Mars, W.V., Chan, Tung W., Lu, Yonglai, Yang, Haibo, Zhang, Liqun
Format: Article
Language:English
Subjects:
Crack precursor
Crack propagation
Critical plane analysis
Fatigue analysis
Fatigue cracks
Fatigue failure
Fatigue life
Mathematical models
Natural rubber
Precursors
Rubber
Strain crystallization
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Summary:•Fatigue life prediction of a dumbbell cylindrical rubber component was performed.•Fatigue life and normal direction angle of crack growth plane were obtained.•We establish the relation between exponent F and R ratio in Mars–Fatemi model.•Fluctuation of fatigue life is due to the crack precursor size inhomogeneity.•We confirm the agreement of precursor sizes from relaxing and non-relaxing tests. Fatigue life prediction for a dumbbell cylindrical natural rubber component under uniaxial tensile loading conditions was performed based on the Thomas fatigue crack growth model for relaxing (R=0) load cycles and the Mars–Fatemi model for non-relaxing (R>0) load cycles. By using a self-written program, we proposed a new approach to establish the relation between the power law exponent F and the R ratio in the Mars–Fatemi model. The approach is based on rubber fatigue life (S–N) data rather than crack growth rate and tearing energy (da/dN–T) data, avoiding certain difficulties often encountered using the crack growth method. The results indicate that the relation between F and R is a quadratic or cubic function over the range 0
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2015.05.011