Discussion: “Chemical Effects of Lubrication in Contact Fatigue—Part I: The Test Program, Data, and Metallurgical Observations” (Howes, M. A. H., Bhattacharyya, S., Bock, F. C., and Parikh, N. M., 1976, ASME J. Lubr. Technol., 98, pp. 286–298), “Chemical Effects of Lubrication in Contact Fatigue—Part II: The Statistical Analysis, Summary, and Conclusions” (Bhattacharyya, S., Bock, F. C., Howes, M. A. H., and Parikh, N. M., 1976, ASME J. Lubr. Technol., 98, pp. 299–307), and “Chemical Effects of Lubrication in Contact Fatigue—Part III: Load-Life Exponent, Life Scatter, and Overall Analysis” (Littmann, W. E., Kelley, B. W., Anderson, W. J., Fein, R. S., Klaus, E. E., Sibley, L. B., and Winer, W. O., 1976, ASME J. Lubr. Technol., 98, pp. 308–315)

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.

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Efficiency of Wire Rope Terminations

Journal of Engineering Materials and Technology ◽

10.1115/1.3224989 ◽

1981 ◽

Vol 103 (2) ◽

pp. 164-170 ◽

Cited By ~ 4

Author(s):

F. Matanzo ◽

J. T. Metcalf

Keyword(s):

Statistical Analysis ◽

Service Life ◽

Laboratory Test ◽

Selection Procedure ◽

Breaking Load ◽

Wire Rope ◽

Test Program ◽

Steel Sleeve ◽

Pull Tests

Nine wire rope terminations were evaluated with respect to true efficiency, service life, and sensitivity to poor workmanship in a comprehensive laboratory test program. The portion of the program concerned with true efficiency, as determined by pull tests to destruction, is reported here. Five diameter values of Lang and Regular construction ropes of the 6 × 19 and 6 × 37 class were used on the following wire rope terminations: Flemish Loop with Steel Sleeve and Thimble, Flemish Loop with Steel Sleeve, Wedge Socket, Swaged Socket, Turn Back Loop with Aluminum Sleeve and Thimble, Thimble Splice with Four Tucks, U-Bolt Clips with Thimble, Zinc Poured Socket, and Resin Poured Socket. The true efficiency was shown to be affected by termination type, rope type, and the interaction of these factors. The efficiency values measured in this test program are less than those reported in the literature which are based on the catalog breaking load rather than on the true breaking load. From a graphic and statistical analysis of the data it was possible to present a selection procedure for optimizing the efficiency.

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