Evaluating the Validity of Rolling Contact Fatigue Test Results

2009 ◽  
Vol 52 (2) ◽  
pp. 223-230 ◽  
Author(s):  
John I. McCool ◽  
Raymond Valori
Keyword(s):  
Fatigue Test ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Test Results

Mechanical Testing

2005 ◽  
pp. 311-327
Keyword(s):  
Fatigue Test ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Mechanical Tests ◽  
Rolling Contact ◽  
Test Procedures ◽  
Single Tooth ◽  
Root Strength ◽  
Single Overload ◽  
Surface Durability

Abstract Mechanical tests are performed to evaluate the durability of gears under load. The chapter first discusses the processes involved in the computations of stress for test parameters of gear. Next, the chapter reviews the four areas of specimen characterization of a test program, namely dimensional, surface finish texture, metallurgical, and residual stress. The following section presents the tests that simulate gear action, namely the rolling contact fatigue test, the single-tooth fatigue test, the single-tooth single-overload test, and the single-tooth impact test. Finally, the chapter describes the test procedures for surface durability (pitting), root strength (bending), and scoring (or scuffing) testing.

Damage in Thermal-Sprayed WC-Co Coatings by Repeated Load

1997 ◽  
Author(s):  
T. Tajiri ◽  
N. Sakoda ◽  
S. Yamamoto ◽  
S. Watanabe
Keyword(s):  
Fatigue Test ◽  
Fatigue Cracks ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Medium Carbon Steel ◽  
Rolling Contact ◽  
Surface Damages ◽  
Load Tests ◽  
Repeated Load ◽  
Thermally Sprayed

Abstract Two types of WC-12wt%Co powders, each manufactured by a different process, were thermally sprayed on a medium carbon steel by HVOF, and repeated load tests (rolling contact fatigue test and high cycles fatigue test) were carried out. The surface damages for the two types of coatings were investigated. It has been clear that the coating damages depend on the types of powders. It has been found that in rolling contact fatigue, there are the coatings, in which damage is characterized by delamination, and by a mixture of delamination and cracks. And it has also been found that in high cycles fatigue, there are the coatings, in which damage is characterized by net-like fatigue cracks, and by linear fatigue cracks.

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