Gear single tooth bending fatigue test
About: This article is published in SAE transactions.The article was published on 1982-02-01. It has received 9 citations till now. The article focuses on the topics: Tooth interior fatigue fracture.
Citations
More filters
TL;DR: In this paper, an experimental campaign aimed at the assessment and comparison of the bending fatigue resistance of two case hardened and three nitrited gear steels was performed, where X-ray measurements were carried out to determine the variations of residual stresses caused by different combinations of steels and thermo-chemical treatments.
43 citations
TL;DR: In this article, the authors investigated the use of presetting as a method to increase the bending fatigue strength of carburized spur gear teeth and found that presetting induces compressive residual stress in the area of the tooth from which fatigue cracks typically originate.
32 citations
TL;DR: In this paper, the application of a presetting process to AISI 1040 steel spur gear teeth was discussed, and it was shown that the presetting increased the bending fatigue life by an average of 670% and 95% for fatigue under an applied maximum unit load of UL=216 MPa and 253 MPa, respectively.
20 citations
01 Jan 1994
TL;DR: In this paper, the authors used acoustic emissions to determine the beginning of crack propagation in a gear using a single-tooth bending fatigue test and showed that the relationship between dynamic stiffness changes and crack propagation can be established.
Abstract: The fatigue life of a gear tooth can be thought of as the sum of the number of cycles required to initiate a crack, N(sub i), plus the number of cycles required to propagate the crack to such a length that fracture occurs, N(sub p). The factors that govern crack initiation are thought to be related to localized stress or strain at a point, while propagation of a fatigue crack is a function of the crack tip parameters such as crack shape, stress state, and stress intensity factor. During a test there is no clear transition between initiation and propagation. The mechanisms of initiation and propagation are quite different and modeling them separately produces a higher degree of accuracy, but then the question that continually arises is 'what is a crack?' The total life prediction in a fracture mechanics model presently hinges on the assumption of an initial crack length, and this length can significantly affect the total life prediction. The size of the initial crack is generally taken to be in the range of 0.01 in. to 0.2 in. Several researchers have used various techniques to determine the beginning of the crack propagation stage. Barhorst showed the relationship between dynamic stiffness changes and crack propagation. Acoustic emissions, which are stress waves produced by the sudden movement of stressed materials, have also been successfully used to monitor the growth of cracks in tensile and fatigue specimens. The purpose of this research is to determine whether acoustic emissions can be used to define the beginning of crack propagation in a gear using a single-tooth bending fatigue test.
10 citations
01 Feb 1995
9 citations
References
More filters
TL;DR: In this article, the applicability of statistics to a wide field of problems is discussed, and examples of simple and complex distributions are given, as well as a discussion of the application of statistics in a wide range of problems.
Abstract: This paper discusses the applicability of statistics to a wide field of problems. Examples of simple and complex distributions are given.
9,091 citations