Contact Fatigue Life and Failure Mode of Plasma Sprayed Coating Based on Statistical Analysis
ZHANG Zhi-qiang1, LI Guo-lu2, WANG Hai-dou3
1. School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China;
2. School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China;
3. National Key Lab for Remanufacturing, Academy of Armored Forces Engineering, Beijing 100072, China
Abstract：The rolling contact fatigue(RCF) life and failure modes of coatings, prepared by plasma sprayed Ni-based alloy, were investigated under different stress levels, and were analyzed and discussed by statistical analysis methods (including variance analysis, regression analysis and discrimination analysis) with R-3.1.1 software as a platform. The results show that the RCF life of the coatings exhibits normal distribution form. In addition, the mean and variance of the coatings' life decreases as the contact stress increases, and the distribution of the fatigue life becomes more concentrated. Furthermore, variance analysis indicates that the contact stress has a significant influence on the RCF life of the coatings. And the mean life of the coatings is linear associated with the contact stress. The discrimination criterion for the failure modes of the coatings is also established. The failure modes of the coatings can be predicted if the contact stress and the fatigue life are designated. And the prediction accuracy of the failure mode is above 65%. Furthermore, the contribution proportion of the fatigue life for the failure mode is obviously higher than that of the contact stress, thus the fatigue life is the main factor determining the failure mode of the coating.
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ZHANG Zhi-qiang, LI Guo-lu, WANG Hai-dou. Contact Fatigue Life and Failure Mode of Plasma Sprayed Coating Based on Statistical Analysis. Journal of Materials Engineering, 2015, 43(8): 77-83.
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