Comparative Service Life Analysis for Gears According to Different Failure Criteria
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TECHNICAL ARTICLE—PEER-REVIEWED
Comparative Service Life Analysis for Gears According to Different Failure Criteria Iftikhar Chalabi
Submitted: 4 August 2020 / in revised form: 20 September 2020 / Accepted: 22 September 2020 ASM International 2020
Abstract In this paper, a comparative analysis of the service life of gears for various failure criteria is carried out. Based on this analysis, a method is proposed for selecting the gearwheel material, the values of the modulus and the wheel width factor, on which the bending strength of the teeth depends. Research has shown that increasing the bending strength of teeth is of great practical importance, both for one-sided and two-sided loads. This also makes it possible to significantly increase the lifetime of one-side loaded gearwheels by replacing their working flanks with non-working ones. In this regard, a method has been developed for changing the working flanks of gear teeth after a certain operating life. Keywords Gearwheel Service life Bending strength Contact stress Working flanks
Introduction Gears are the most used machine elements in today’s industry, and therefore, investigations into their reliability and increase in service life are still of great importance. According to damage statistics, 60% of all transmission damage occurs on gears [1]. The reasons for the failure of gears are very diverse. The type of damage most likely to occur on the gear under consideration generally depends on many factors, such as operating conditions, material properties (as well as heat treatment and lubricant selection), geometric dimensions, manufacturing accuracy, etc. I. Chalabi (&) Department of Machine Design, Azerbaijan Technical University, Javid Avenue 25, AZ1073 Baku, Azerbaijan e-mail: [email protected]
For timely elimination of possible damage to the teeth, as well as increasing the service life of gears, it is particularly important to choose the right materials and geometric dimensions at the design stage and conduct regular maintenance work during operation. In the existing literature [1–6], calculations of gears based on the main failure criteria are usually considered separately. And in this case, the corresponding designed life of gears for different failure criteria are not compared. Therefore, in most cases, it is not possible to judge which type of damage to the teeth is more likely and may occur earlier than others. Some types of damage to the teeth (for example, teeth breakage) are the most dangerous, and their onset is accompanied by a complete failure of not only this gearwheel, but sometimes the entire gearbox. And other types of damage to the teeth (for example, pitting) do not always lead to complete destruction of the gear, and they can in some cases be prevented in various ways. Therefore, a comparative lifetime analysis for gears according to different failure criteria can be of great practical importance. In [7, 8], the bending strength of the teeth of various gears is studied by modern methods. However, the assessment of th
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