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A Study on the Evaluation Method and Prediction of Uniaxial Fatigue Life for Automotive Rubber Isolator

Author: XieXinXing
Tutor: ShangGuanWenBin
School: South China University of Technology
Course: Vehicle Engineering
Keywords: automotive rubber isolator hyperelastic constitutive models fatigue evaluation parameter weibull distribution life prediction
CLC: TB535.1
Type: Master's thesis
Year: 2011
Downloads: 232
Quote: 2
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Abstract


The study objective is to provide the design theory and methods for developing fatigue property of automotive rubber isolator.In this paper, taking a typical rubber material used in automotive rubber isolator as study object, the evaluation method and prediction of uniaxial fatigue life for a rubber isolator were investigated based crack nucleation approache. The contents of this dissertation include:1.The stress-strain curves of standard rubber specimen were tested by uniaxial tension,biaxial tension and planar tension with different strain level,the effects of Mullin effect on stress-strain behavior of rubber material were analyzed.Stress-strain data was selected as the material property parameter used in finite element analysis(FEA).Taking dumbbell rubber specimen as study example,the quasi-static force versus displacement of dumbbell rubber specimen was calculated by five general hyperelastic constitutive models respectively, the simulation result had been compared with tested data.A hyperelastic constitutive model with better computational precision was chosed,then the model was used in FEA related with rubber fatigue study.2.Taking standard rubber specimens as fatigue test object,the fatigue tests of standard rubber specimens were carried out under the testing condition that engineering strain R ratio is zero. Fitting correlation between five various evaluation parameters and life data of standard rubber specimens was analyzed. Maximum principal strain of logarithmic strain was chosen as the evaluation parameter which was applied in uniaxial fatigue life prediction study of a rubber isolator.3.Dumbbell rubber specimen for tension and compression fatigue testing and ring rubber specimen for simple shear fatigue testing were designed, fatigue life tests and statistics of the two type specimens were carried out respectively. Fatigue life data of the two type specimens was analyzed,life distribution rules of the rubber material with different stress forms and loading conditions were well understood. The total fit result of various statistical distributions for fitting the life data of dumbbell rubber specimen was compared.Consistency of the fit with fatigue physics was considered, then, the two-parameter weibull distribution was chosen as the appropriate assumed statistical distribution of the rubber material life data.4.The life of 90% reliability with 90% confidence was used as life predition acceptance criteria. Taking two rubber isolators with different structure as study example, test validation study of the uniaxial fatigue life prediction for a rubber isolator were carried out using the life data of dumbbell rubber specimen and the method presented in this paper.The results of fatigue life prediction were analyzed.It’s shown that the methods and life data of rubber material presented in this paper are effective in doing uniaxial fatigue life prediction of automotive rubber isolator。

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CLC: > Industrial Technology > General industrial technology > Acoustic engineering > Vibration, noise and its control > Vibration and noise control and its use > Vibration isolation, damping materials and structures
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