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Study on Fatigue Life Prediction of Rubber Elastic Absorber

Author: WangWeiXiao
Tutor: DingZhiPing
School: Hunan University
Course: Mechanical Design and Theory
Keywords: Rubber Tearing energy Fatigue model Finite Element Analysis Fatigue Life Prediction
CLC: TB535.1
Type: Master's thesis
Year: 2009
Downloads: 328
Quote: 0
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Abstract


With the rapid development of rail transportation, people on vehicle safety, comfort and reliability of a higher demand. Rubber elastic damping element with its good damping and isolation properties, is more widely used in rail vehicles damping systems. Rubber elastic damping element in the track from a vehicle traction system, suspension, vibration isolation, the role of the buffer, using complex conditions, by the action of alternating stress, its life is directly related to the security and reliability of the vehicle, the study They are long-term mechanical loads in the fatigue fracture behavior, for more accurate analysis and life prediction strength, its structure optimization design to provide theoretical guidance, is of great use value and practical significance. In this paper, rubber material fracture mechanics method of fracture, fatigue characteristics to tearing energy as the main parameter to establish rubber vibration fatigue life prediction model. Through a typical rubber elastic damping element - conical spring nonlinear finite element analysis, research rubber materials under complex stress state equivalent stress calculation method, the complexity of rubber elastic element under stress fatigue problem into a one-way under stress fatigue problems, so the rubber elastic element fatigue life prediction, and finally through conical spring fatigue test results verify the model. Text in two parts: The first part of the existing rubber material constitutive model analysis and study, and the use of rubber mechanical properties of experimental data three bands, four bands and five bands Ogden hyperelastic constitutive model parameters for later conical spring nonlinear finite element analysis. Secondly, based on fracture mechanics theory, with a unilateral pre-cut tensile (SENT) specimen strain energy, with tear and elongation of the specimen incision length relationship between the finite element simulation, the establishment of the SENT specimen J-integral and tearing energy quantitative relationship between. Third, according to the rubber material tearing energy and crack growth rate of power-law relationship, the use of pure shear NR68 rubber specimen fatigue crack growth test data obtained in order to tear damage parameter can range from a rubber material fatigue life prediction model , for the rubber damping element fatigue life assessment basis. The second part of the conical spring by nonlinear finite element simulation to analyze the static strength and stiffness properties and mechanical properties of materials based on rubber cone springs calculated equivalent stress distribution, find dangerous parts of the tearing energy range; the use of rubber material fatigue life prediction model to predict the fatigue life of conical springs, and with conical spring fatigue bench results were compared to analyze the main causes and effects of error factors. Finally, the text of the main work and conclusions are summarized, and future work prospects.

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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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