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Ningbo, China

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 Source


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. Source


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. Source


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. Source


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. Source

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