Simulation of Failure in the Refractory Lining of Coke Dry Quenching
Authors: Xia Chen, Qing Ming Chang
Abstract: A model based on damaged mechanics is presented to analyze the failure behaviour of coke dry quenching refractory lining under circumstance of multifarious change of temperature by using finite element method. The refractory material behavior can be described by Drucker-Prager Plasticity model for compression and strain softening under tension. The simulation result is consistent with the experiment result. This paper provides a new method for the failure analysis of refractory material. The results can be used to optimize the lining design and the material selection.
Response Analysis of Asphalt Pavement on Vehicle Dynamic Load Based on Numerical Method
Authors: Li Cheng Yang, Li Wei Ning, Jin Xiang Hu, Yi Ping Luo
Abstract: The three dimensional finite element model of the pavement has been built on the basis of elastic-plastic finite element method and the assumption of the layered system of asphalt pavement. The layered flexible pavement is composed of asphalt surface, granular base and cohesive soil subgrade and is acted by dynamic movement load. The simulation results show that vertical displacement of asphalt surface has the maximum value and reduces gradually with the improvement of the road depth. Vertical stress, longitudinal stress and transverse stress result in the fatigue damage of asphalt pavement together. The key factor is the alternating variation of longitudinal stress. The maximum longitudinal stress and the maximum transverse stress exist in the junction of the asphalt layer and the granular base. Furthermore, the maximum longitudinal strain and the maximum transverse strain are induced in the junction of the granular base and the soil subgrade.
Effect of Polypropylene Fiber on Strength and Flexural Properties of Concrete Containing Silica Fume
Abstract: A designed experimental study has been conducted to investigate the effect of polypropylene fiber on the compressive strength and flexural properties of concrete containing silica fume, a large number of experiments have been carried out in this study. The flexural properties include flexural strength and flexural modulus of elasticity. On the basis of the experimental results of the specimens of six sets of mix proportions, the mechanism of action of polypropylene fiber on compressive strength, flexural strength and flexural modulus of elasticity has been analyzed in details. The results indicate that there is a tendency of increase in the compressive strength and flexural strength, and the flexural modulus of elasticity of concrete containing silica fume decrease gradually with the increase of fiber volume fraction.
Thermal Stress Simulation of the Surface Grinding
Authors: Chong Lue Hua, Gui Cheng Wang, Hong Jie Pei, Gang Liu
Abstract: Thermal stresses of grinding plays an important role on the fatigue and wear resistance of the component. A comprehensive analysis of thermal stress induced by surface grinding has been conducted with aid of the finite element method. To obtain a reliable figure of thermal stress induced by grinding, temperature-dependent properties of workpiece materials were taken into account. The developed finite element procedure has also been applied to calculate the surface and sub-surface thermal stress induced by moving source of triangular heat when convection and radiation is occurred over the whole work. Based on an analysis of the effects of wheel velocity on the thermal stress distributions in an elastic-plastic solid, some important conclusions were given.
Analysis of Failure Mode of Masonry Wall under Vertical Compressive Stress
Authors: Hui Hui Zhao, Wen Fang Zhang
Abstract: The application of ABAQUS finite element software non-linear finite element analysis of brick masonry walls with structural column. Build three brick masonry wall models, and analysis of the damage form of the wall under different vertical compressive stress and horizontal force. Thus the analysis result compared with the calculation result of the relevant specification formula, in order to get validate compression influence of masonry aseismic walls. It turned out that different vertical compressive stress effect the shear capacity, and failure mode of brick masonry wall structure with a structural column.
Hegab, HIA (1977) Statics and dynamics of suspension bridges with notes on suspension cables and nets. PhD thesis, University of Tasmania.
A historical review of the construction and erection of suspension
bridges, and of the literature on them, is presented. Suspension bridges
are of ten analysed as plane structures, as if a bridge has only one cable
supporting a narrow deck with no torsional stiffness and no torsional
stresses. The statics and dynamics of a laboratory model of such a single cable bridge are investigated both experimentally and analytically,
followed by a short chapter on the dynamics of suspension cables and nets .
A real suspension bridge has usually two or more cables supporting a
deck with some width and some torsional stiffness, and undergoes torsion .
A laboratory model for a two-cable bridge was designed and built. A
method for the static analysis of such a two-cable bridge is derived and
used for both the static and dynamic analyses of the model. Measurements
of the static deflections and natural frequencies and modes of vibration
of the model showed good agreement with calculations.
A chapter comprising some notes on the aerodynamic instability of
suspension bridges is also included.
|Item Type:||Thesis - PhD|
|Keywords:||Suspension bridges, civil engineering|
Copyright the Author-The University is continuing to endeavour to trace the copyright owner(s) and in the meantime this item has been reproduced here in good faith. We would be pleased to hear from the copyright owner(s).
|Date Deposited:||26 May 2014 04:09|
|Last Modified:||15 Sep 2017 00:59|
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