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Shangguan W.-B.,Jilin University | Shangguan W.-B.,South China University of Technology | Liu T.-K.,Jilin University | Liu T.-K.,South China University of Technology | And 4 more authors.
Fatigue and Fracture of Engineering Materials and Structures | Year: 2014

A method for modelling fatigue life of rubbers and rubber isolators is presented in this paper. Firstly, a fatigue experiment is carried out for a rubber dumbbell cylindrical specimen and a rubber isolator. Based on the finite element analysis, the damage parameters including the strain energy density, the maximum principal Green-Lagrange strain and the effective stress are calculated and discussed. Secondly, three fatigue life prediction models are established by using the three damage parameters and using the relation between the measured fatigue life of a dumbbell cylindrical specimen and the computed value of the damage parameters. Thirdly, three proposed prediction models are used to investigate which one can be best used to predicting fatigue life of rubber isolators, taking a typical powertrain rubber isolator as studying example. The fatigue lives of the rubber isolator predicted by the three models are compared with the experimental life. The results demonstrate that the predicted fatigue lives of the rubber isolator using the three fatigue models agree well with the experimental fatigue life within a factor of four, and the model using the effective stress as the damage parameter can predict the fatigue life within a factor of two, which has the best accuracy among the three models. © 2014 Wiley Publishing Ltd.


Shangguan W.-B.,Jilin University | Shangguan W.-B.,South China University of Technology | Wang X.-L.,Jilin University | Wang X.-L.,South China University of Technology | And 5 more authors.
Materials and Design | Year: 2014

A tension fatigue model of filled natural rubbers is investigated to study the contributions of two key factors, namely, the damage parameter and the specimen geometry used in the fatigue experiment. The uniaxial tension fatigue experiments were carried out for three filled natural rubber specimens with different geometry: a dumbbell simple tension specimen (STS), a dumbbell cylindrical specimen (DCS), and a hollow cylindrical specimen (HCS). The commonly used damage parameters for fatigue life prediction are discussed. The fatigue life prediction models are formulated using the measured tension fatigue life of the STS together with different damage parameters. The effectiveness of the models is established in terms of a correlation coefficient characterizing the error between the measured and predicted fatigue lives. It is concluded that all the damage parameters considered in the study can effectively estimate the tension fatigue life with correlation coefficients exceeding 0.9. The fatigue life model formulated for the STS was also found to be appropriate for predicting the fatigue life of specimens with different geometry (DCS and HCS) suggesting that the relationship between the tension fatigue life and the damage parameters is independent of the specimen geometry. One may thus conduct tension fatigue tests with STS alone in order to model the tension fatigue life of rubbers with alternate geometry. © 2014 Elsevier Ltd.


Chen L.,Zhejiang University of Technology | Bao Y.-M.,Zhejiang University of Technology | Pan X.-Y.,Ningbo Tuopu Group Co. | Duan X.-C.,Ningbo Tuopu Group Co.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2012

A data table of dynamic-static ratio and a data table of fatigue life under different test conditions were obtained with abundant dynamic-static stiffness tests and fatigue tests. Taking dynamic characteristics of a rubber isolator into account, a conversion relationship between road load and strain of an engine mount was built. According to Miner theory of linear damage accumulation and the damage equivalent principle, an accelerative fatigue test spectrum(AFTS) was worked out through editing road loading spectrum processed with the rain-flow method. Some fatigue tests of the engine mount were performed using AFTS. The results showed that AFTS is effective in doing fatigue tests for a rubber isolator; and the fatigue test period and the product development one decrease obviously.


Wang X.,South China University of Technology | Shangguan W.,South China University of Technology | Shangguan W.,Ningbo Tuopu Group Co. | Liu T.,South China University of Technology | And 4 more authors.
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2013

A uniaxial tension fatigue test is carried out for two filled natural rubber specimens, dumbbell simple tension specimen (STS) and dumbbell cylinder specimen (DCS). Based on the STS experimental data, the fatigue life prediction models using some commonly used damage parameters (maximum principal strain, octahedral shear strain and strain energy density) are established and used for estimating fatigue life. The comparison of estimated and measured fatigue lives for STS shows that all damage parameters discussed can be used to estimate tension fatigue life with correlation coefficient greater than 0.9, among which the model using maximum principal Green-Lagrange strain peak has the largest correlation coefficient with a value of 0.9966. Based on the model using maximum principal Green-Lagrange strain peak of STS, the fatigue life of a DCS is estimated. The estimated fatigue life of a DCS is compared with the measured data, which shows a good correlation. It is concluded that one can carry out only tension fatigue test using STS to model the tension fatigue of rubbers, with a lower cost and shorter test period. © 2013 Journal of Mechanical Engineering.


Shangguan W.,South China University of Technology | Shangguan W.,Ningbo Tuopu Group Co. | Wang X.,South China University of Technology | Ye B.,Ningbo Tuopu Group Co. | And 3 more authors.
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2013

Under various strain ratios R loads, a uniaxial fatigue experiment is carried out for a dumbbell cylindrical specimen of filled natural rubbers used in automotive rubber isolators. Based on the measured fatigue data, the effect of R on fatigue life is discussed and two fatigue prediction models are established. The model I is based on the damage parameter of strain peak, and the model II is based on the damage parameter of strain amplitude. It is concluded that both the two models are appropriate for predicting fatigue life under R≥0 loading conditions, while under R<0 loading conditions the model II can't be used for predicting fatigue life of filled natural rubbers. An equivalent strain amplitude is proposed as a damage parameter for predicting fatigue life under R<0 loading conditions. The predicted fatigue life using the proposed equivalent strain amplitude as the damage parameter is in a good agreement with the experimental fatigue life within a factor of two, and with an improved correlation coefficient of 0.923 1.The proposed model for fatigue life prediction with the equivalent strain amplitude can be used to estimate the fatigue life for a rubber component with filled natural rubbers for any strain ratio. © 2013 Journal of Mechanical Engineering.


Wang X.-L.,South China University of Technology | Shangguan W.-B.,South China University of Technology | Shangguan W.-B.,Ningbo Tuopu Group Co. | Rakheja S.,South China University of Technology | And 2 more authors.
Fatigue and Fracture of Engineering Materials and Structures | Year: 2014

Rubber components are widely used in many fields because of their superior elastic properties. Fatigue failures, commonly encountered in rubber components, however, remain a critical issue. In this study, the effect of strain ratio R on the fatigue life of filled natural rubbers used in automotive mounts is investigated experimentally and numerically. A uniaxial tension/compression fatigue experiment was conducted on dumb-bell cylindrical rubber specimens subject to loads representing different R ratios. The experimental fatigue data are used to formulate two preliminary fatigue models based on peak strain and strain amplitude as the damage parameters. The deficiencies of these two models in predicting fatigue life over a wide range of R ratios are discussed, and an alternative life prediction model is proposed. The proposed model incorporates the effect of R ratio using an equivalent strain amplitude. It is shown that the proposed model could effectively predict fatigue life over a wide range of R ratios with an improved accuracy. © 2013 Wiley Publishing Ltd.


Meng Y.,Hefei University of Technology | Li B.,Ningbo Tuopu Group Co. | Wang Y.,Hefei University of Technology
Geotechnical and Geological Engineering | Year: 2016

Airtight blast door, as the critical component of underground coal mine, requires high quality. Topology and shape optimization were seldom applied in the structure design of products though they were proposed early. Based on those optimization methods and the experience of structure design, a new kind of airtight blast door was developed in this paper. The main component weight of thus kind of door is 14 % smaller than the current airtight blast door without reducing the blast and impact behavior. The typical optimization method and the example presented in this paper are useful for the original development and optimization design in other products. © 2016 Springer International Publishing Switzerland


Pan X.-Y.,Ningbo Tuopu Group Co. | Xie X.-X.,South China University of Technology | Shangguan W.-B.,Ningbo Tuopu Group Co. | Shangguan W.-B.,South China University of Technology
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2012

The dynamic properties of a typical hydrobush were tested. It was shown that the amplitude dependency and frequency dependency of the hydrobush dynamic properties are correlative. Hyperelastic-viscoelastic-plastic (HEVEP) finite element model of a hydrobush, containing hyperelastic-viscoelastic (HEVE) model and elastic-plastic (EP) model, was constructed based on an approach named mesh-superimposition. The dynamic properties of the main rubber element (MRE) of the hydrobush were calculated with HEVE model and HEVEP model, respectively, the simulation results of the two models were compared, the results showed that using HEVEP model can help to express exactly the contribution of MRE to the hydrobush dynamic properties. The fluid-structure interactive (FSI) model of a hydrobush was described in details. Furthermore, the HEVE model and HEVEP model were applied respectively in analysis for dynamic properties of a hydrobush using FSI method. The simulation results of the two models were compared, the results showed that HEVEP model is better than HEVE model to reflect the actual correlation characteristic of the amplitude dependency and frequency dependency of the dynamic properties of a hydrobush. These methods could give an effective guidance to early development and design of a hydraulic rubber isolator.


Wang W.,South China University of Technology | Shangguan W.,South China University of Technology | Shangguan W.,Ningbo Tuopu Group Co. | Duan X.,South China University of Technology | And 2 more authors.
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2012

Effectively predicting the fatigue life of rubber components is a crucial part of design and development for them. In this study, the principle of linear cumulative fatigue damage is introduced to fatigue life prediction of rubber components. Afterwards, a standard for fatigue failure of rubber materials in actual loading conditions is recommended. Based on a simplified deformation of rubber material, dumbbell-shaped test column for tensile load and rubber ring rubber test column for bearing shear load are designed and its fatigue life data are obtained. To develop a formula of fatigue life, the least square method is employed with using tensile and shear test data. Taking one rear mount of engine and another mount of gearbox as research examples, their fatigue life are predicted and compared with experimental result in two typical operating conditions, which validated the predictive method for rubber component fatigue life in present work. The comparison also revealed that, the trend and shape of tensile fatigue life curve and simple shear fatigue life curve of rubber material are strikingly similar. Moreover, the fatigue life of the rubber mount can be effectively predicted by using fatigue life prediction formula of tensor form. © 2012 Journal of Mechanical Engineering.


Shangguan W.,South China University of Technology | Shangguan W.,Ningbo Tuopu Group Co. | Chen C.,South China University of Technology | Duan X.,South China University of Technology | And 2 more authors.
Zhendong Ceshi Yu Zhenduan/Journal of Vibration, Measurement and Diagnosis | Year: 2012

A Lumped Parameter (LP) model of Torsional Vibration (TV) in engine crankshaft system is established, and a detailed procedure for determining the inertias, torsional stiffness and damping coefficients of the LP model is presented. The proposed model is then used to calculate the natural frequencies of crankshaft and the TV of cranknose with cylinder loads. A test is carried out to obtain the TV of an engine crankshaft, and the experiment data is compared with the calculated results. The comparison shows that the calculated natural frequencies of crankshaft and TV amplitude of cranknose agree well with the measured values, which validates the proposed model and the method for determining parameters of the LP model. Thus, the modeling method of crankshaft system and the procedure of determining parameters of the model presented in this paper can be used for the design and calculation of TV Absorber (TVA).

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