Chemical Effects of Lubrication in Contact Fatigue—Part II: The Statistical Analysis, Summary, and Conclusions

1976 ◽  
Vol 98 (2) ◽  
pp. 299-305 ◽  
Author(s):  
S. Bhattacharyya ◽  
F. C. Bock ◽  
M. A. H. Howes ◽  
N. M. Parikh
Keyword(s):  
Statistical Analysis ◽  
Contact Fatigue ◽  
Chemical Effects

Chemical effects on UV irradiation absorption of fouled quartz sleeves in ultraviolet disinfection

2008 ◽  
Vol 8 (2) ◽  
pp. 217-222 ◽  
Author(s):  
Beibei Zhu Sun ◽  
Ernest Blatchley ◽  
Mike Oliver ◽  
Cheng Zheng ◽  
Kristofer Jennings
Keyword(s):  
Statistical Analysis ◽  
Uv Disinfection ◽  
Uv Absorbance ◽  
Ultraviolet Disinfection ◽  
High Chemical ◽  
Chemical Surface ◽  
Chemical Effects ◽  
Uv Transmittance ◽  
Main Effects ◽  
Iron And Manganese

The effects of foulant chemical composition on ultraviolet (UV) absorbance of fouled quartz sleeves in UV disinfection systems were studied. Statistical analysis was conducted to examine the effects of nine fouling chemicals on the UV transmittance changes of fouled quartz lamp sleeves. The results demonstrated that the main effects were attributable to surface concentrations of iron and manganese. The surface concentrations of calcium and copper had no significant effects on the UV absorbance of fouled sleeves. The interaction effects of copper with iron and magnesium with manganese were also revealed from the statistical analysis. The model is able to give reasonable predictions of the UV absorbance characteristics of foulants from other UV systems. However, several limitations of this model were identified. First, the model does not accurately predict the absorbance at relatively high chemical surface concentrations. Second, the model does not account for the possible effects of anions and organics on UV absorption of fouled quartz sleeves.

scholarly journals Statistical analysis on rolling contact fatigue in railroad axle bearing steel

2018 ◽  
Vol 42 (3) ◽  
pp. 651-663
Author(s):  
Rubing Guo ◽  
Guangxue Yang ◽  
Zhengyang Li ◽  
Zhiming Liu ◽  
Yujie Wei
Keyword(s):  
Statistical Analysis ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Bearing Steel ◽  
Rolling Contact ◽  
Railroad Axle

Chemical Effects of Lubrication in Contact Fatigue—Part I: The Test Program, Data, and Metallurgical Observations

1976 ◽  
Vol 98 (2) ◽  
pp. 286-298 ◽  
Author(s):  
M. A. H. Howes ◽  
S. Bhattacharyya ◽  
F. C. Bock ◽  
N. M. Parikh
Keyword(s):  
Contact Fatigue ◽  
Test Program ◽  
Chemical Effects ◽  
Program Data

Chemical Effects of Lubrication in Contact Fatigue—Part III: Load-Life Exponent, Life Scatter, and Overall Analysis

1976 ◽  
Vol 98 (2) ◽  
pp. 308-315 ◽  
Author(s):  
W. E. Littmann ◽  
B. W. Kelley ◽  
W. J. Anderson ◽  
R. S. Fein ◽  
E. E. Klaus ◽  
...  
Keyword(s):  
Relevant Literature ◽  
Contact Fatigue ◽  
Fatigue Tests ◽  
Operating Conditions ◽  
Zinc Dialkyldithiophosphate ◽  
Additive Package ◽  
Chemical Effects ◽  
Contact Fatigue Life ◽  
Program Show ◽  
Selection Of

A brief review of relevant literature is presented with the logic underlying the selection of lubricant base stocks, additives, materials, surface textures, and other variables used in contact fatigue tests under rolling-sliding conditions. Tests of selected combinations (mineral oil with and without a zinc dialkyldithiophosphate additive and a polyolester synthetic with and without its typical additive package) showed that lubricant chemistry affects the stress/life slope and the Weibull slope (scatter in life). Results of the overall program show that the relative contact fatigue life for different lubricant chemistries should be evaluated using operating conditions, especially stress and slip levels, near to expected application conditions.

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