Evaluation method and device for bending fatigue limit of meshing gears based on notched specimens

Abstract

The invention discloses a notched test piece based meshing gear bending fatigue limit evaluation method and device. The method includes the steps of 1), establishing meshing gear pair finite element models; 2), establishing finite element models of notched test pieces; 3), determining stress concentration factors of model root portions in the step 1), and establishing relation curves of the stress and the depth of tooth surfaces; 4), determining stress concentration factors at the positions of notches of the test pieces in the step 2), and establishing relation curves of the stress and the depth of notched surfaces; 5), comparing consistency of the stress concentration factors in the steps 3) and 4) with the overlap ratio of the relation curves, repeating the step 4) and determining final geometric parameters and fatigue limit load of the notched test pieces; 6), determining the length of inherent cracks of materials; 7), performing modeling on gears of optional dimensions, repeating the steps of 3), 4) and 5), and determining the geometric parameters and load features of the corresponding notched pieces; 8), establishing gear bending fatigue limit estimation models; 9), establishing equivalent stress relation of the notched test pieces and the gears and determining gear bending fatigue lives.

Description

technical field [0001] The invention relates to a calculation technology for gear bending fatigue strength, in particular to a method for evaluating the bending fatigue limit of meshing gears based on a notch test piece, and belongs to the field of structure evaluation and test testing. Background technique [0002] Gears are the main body of power transmission, and tooth bending fatigue is the most common fatigue failure mode in gears. Determining the bending fatigue strength of gears has become an important basis for gear anti-fatigue design. [0003] The existing methods for evaluating the bending fatigue limit of gears mainly include the traditional method and the finite element method. The traditional method is mainly based on the calculation method of bending stress in material mechanics, and evaluates the tooth root stress from the perspective of cantilever beam equivalent and coefficient correction, which has a great approximation. The conventional finite element me...

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Problems solved by technology

However, the gear processing process is complicated, the production cycle is long, and the geometric parameters such as the gear module and the number of teeth change, the test must be carried out again, which takes a lot of time and cost

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