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Plastic gear contact fatigue life evaluation method considering temperature influence

A technology for plastic gear and life evaluation, applied in design optimization/simulation, calculation, computer-aided design, etc., can solve the problems of fatigue life and friction and wear that remain in the empirical formula stage, and the difficulty of predicting the bearing capacity and failure mode of plastic gears. , to achieve the effect of reducing accidents and economic damage

Pending Publication Date: 2020-05-12
CHONGQING UNIV
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Problems solved by technology

However, the current plastic gear design methods and theories are still limited to the linear elastic constitutive relationship, ignoring the influence of temperature on its mechanical properties, and the key fatigue life and friction and wear problems in the service process of plastic gears are still in the empirical formula stage. It brings great difficulties to the prediction of load capacity and failure mode of plastic gears

Method used

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  • Plastic gear contact fatigue life evaluation method considering temperature influence
  • Plastic gear contact fatigue life evaluation method considering temperature influence
  • Plastic gear contact fatigue life evaluation method considering temperature influence

Examples

Experimental program
Comparison scheme
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Embodiment

[0063] The main parameters of the gear pair geometry are as follows:

[0064]

[0065] The small gear is the driving wheel and the material is carburized steel 18CrNiMo7-6; the big gear is the driven wheel and the material is POM (M90-44). The basic parameters of the material are as follows:

[0066]

[0067] Step 1. Test the tensile mechanical properties of plastic gear materials with temperature changes

[0068] According to the standard GB1040-92 plastic tensile performance test method, the elastic modulus, ultimate tensile stress and true plastic stress-strain curve of POM gear material with temperature change are obtained, see Figure 1-3 .

[0069] Step 2: Establish the thermo-elastoplastic constitutive equation of plastic gear material

[0070] The thermoelastic constitutive equation of the plastic gear material at the elastic stage is:

[0071] σ=(αT+E 0 )ε

[0072] The thermoplastic constitutive equation of plastic gear material at the plastic stage is:

[0073]

[0074] T *m =(T...

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Abstract

The invention discloses a plastic gear contact fatigue life evaluation method considering temperature influence. The method comprises the following steps: step 1, testing plastic temperature-related mechanical behaviors according to standards; 2, fitting a plastic thermoelastic-plastic constitutive equation according to the test data, and writing a subprogram UMAT of ABAQUS; 3, determining the temperature of the plastic gear in the operation process by calculation or test; 4, establishing a two-dimensional gear complete thermal coupling contact finite element model on the ABAQUS platform; 5, fitting a limit tensile stress equation changing along with temperature according to the material test parameters, and obtaining plastic fatigue parameters according to the conversion relation betweenthe tensile yield limit and the fatigue parameters; and step 6, calculating the fatigue life of the plastic gear by using a Brown-Miller multi-axis fatigue criterion. The method has the technical effect that the problem of contact fatigue failure of the plastic gear under the influence of the operating temperature is solved.

Description

Technical field [0001] The invention belongs to a method for analyzing contact fatigue failure of mechanical parts, and specifically relates to a method for evaluating the contact fatigue life of a plastic gear. Background technique [0002] Compared with metal materials, plastic gears have the advantages of light weight, corrosion resistance, and less vibration. They are widely used in household appliances, automobiles, and medical fields. At present, the commonly used materials for plastic gears are polyoxymethylene (POM), nylon (PA), polyether ether ketone (PEEK) and their composite materials. The mechanical properties of these materials are closely related to temperature, and their failure mode usually manifests as teeth under lubrication. Surface contact fatigue failure. However, the current design methods and theories of plastic gears are still limited to the linear elastic constitutive relationship, ignoring the influence of temperature on its mechanical properties. The k...

Claims

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Application Information

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IPC IPC(8): G06F30/23G06F119/04
Inventor 刘怀举卢泽华朱才朝
Owner CHONGQING UNIV
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