Papers by Keyword: Mechanical Model

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Authors: Berend Denkena, Thilo Grove, Lukas Tatzig
Abstract: Wire sawing with diamond tools is a highly flexible cut-off grinding process with regard to machinable component structure and composition. Nowadays, it is deployed in many fields of application e.g. the dismantling of nuclear or industrial plants. Here, steel has to be cut which results in lower productivity and tool life compared to the conventional processing of natural stone. To ensure a properly designed process the mechanical and thermal tool loads have to be known in advance. This paper presents an analytical model that predicts the mechanical load as a function of the process parameters.
Authors: Tian Tian Song, Xiang Sheng Chen
Abstract: The forces on TBM druing tunnelling are analyzed in detail based on the characteristics of mixed face strata. Suitable parameters of TBM are choosed according to the characteristics of the strata ahead. The studies are focused on both the acting posture of TBM and the points of the main forces. A systemic model is consequently set up, which can provide ones with analysis of TBM stability, parameter calculation and tunnelling design in mixed strata. Two cases are finally analyzed of TBM tunnelling in different mixed strata by using this model. Then some of countermeasures is given as reference for TBM tunnelling in such mixed strata in the further.
Authors: Gang Li, Li Da Zhu, Jian Yu Yang, Wan Shan Wang
Abstract: By using fracture mechanics theory of rock, the rock fragmentation mechanism of tunnel boring machine (TBM) cutters is analyzed and the analysis of forces of cutter is carried out. A new method to predict disc cutter specific energy for TBM is developed in this study. By using the dynamic models of TBM cutters interaction with the rock, specific energy prediction model for TBM cutter head is developed. The data from the actual tunnel construction is analyzed by using an example of Qinling tunnel and the comparison is made with the field data. The results indicate that the model developed in this study could not only replace the experiment to disc cutter specific energy for TBM, but also provide a theoretical basis for the performance prediction and optimal design of cutter head for TBM.
Authors: Yan Yang, Chang Hua Lin, Hui Li, Jing Zhou
Authors: Shan Suo Zheng, Xiao Yu Shang, Wei Wang, Lei Li
Abstract: Based on the object-oriented finite element analysis software OpenSEES, a hinged 3-floor 2-span, SRHSHPC frames numerical simulation model was built up, under low cycle loading. Comparing the numerical simulation results with experimental data, the results show that four Gauss integral points of the Nonlinear Beam-Column Element with fiber - model can get best simulation effect. This study can provide theory basis for the SRHSHPC frames numerical simulation and the development of seismic performance.
Authors: Shou Hui Chen, Hong Qin Yu
Abstract: The tensile performance of the woven membrane materials shows three characters: nonlinear, anisotropic and non-elastic. Besides, when suffering from the bi-axial loads, the tensile property of the woven membrane material is more complicated. These features make the analysis of the tensile performance of woven membrane materials more difficult. The analysis methods including the elastic matrix method, the mathematical function method, and the mechanical model method have been discussed in details.
Authors: Yan Hai Yang, Hua Cai, Min Jiang Zhang, Yan Xu
Abstract: The recycle of asphalt pavement material is not only accordance with the policy of national energy conservation and emission reduction, but also can significantly reduce the project cost. Viscoelastic mechanical model of recycled asphalt mixture is studied based on pavement maintenance engineering of Shenyang-Shanhaiguan expressway, and with analysis of material performance we could collect testing data from bending creep test on small beam, obtain testing parameters through fitting method. The results indicate that general Maxwell model could nicely reflect the viscoelastic mechanical behavior of recycled asphalt mixture.
Authors: Miroslav Sýkora, Milan Holicky
Abstract: Resistances of mechanical systems are primarily dependent on material properties, geometry and uncertainties associated to an applied resistance model. While materials and geometry can be relatively well described, the resistance model uncertainty is not yet well understood. The present contribution proposes a general concept of the model uncertainty. Factors affecting results obtained by tests and models and influences of actual structural conditions are overviewed. Application of theoretical principles is illustrated by an example of historic iron columns considering a simple mechanical model. Proposed probabilistic description of the model uncertainty consists of the lognormal distribution having the mean 1.35 and coefficient of variation of 0.12.
Authors: Yasuyuki Kato
Abstract: This paper describes the creep deformation behavior of catheter which is made of soft nylon resin and is reinforced with thin stainless wires called braid. In this research, the creep deformation behavior of uniaxial tension generated under two-stage step stress is examined as the most fundamental case that the principal axis of stress is fixed in a space. And the mechanical model, which is composed of a Voigt unit and a single spring element, is proposed for representing the creep deformation behavior. Then, the numerical simulation is carried out, and the validity of this model is verified by comparing the analytical results with the experimental results under two-stage step stress.
Authors: Pin Le Zhang
Abstract: Reinforced concrete (RC) structural walls are one of the most commonly used lateral load resisting systems for high-rise buildings in strong seismic regions because of its good lateral resistance. Serious damage occurs when RC structure subjected to strong seismic action. Classified and brief comment of documents concerning damage indices and its calculation methods are conducted. It could be concluded that most of the damage evaluative models can not directly consider the effect of cumulative damage of material to mechanical properties of structure. Suggestions are proposed to improve the accuracy in damage evaluation of RC structure.
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