Papers by Keyword: Stress Strain

Abstract: Temperature and load are the major factors of road surface deformation. This paper studies how the temperature causes the road surface deformation and what the deformation trend is. A simplified model of the pavement structure and double round load loading mode were adopted respectively to analyze the stress and strain changes of road surface result of the load and the coupling effect of temperature and load. The major conclusions drew on this study are: stiffness modulus of asphalt mixture attenuates rapidly as the temperature increases, and thereby results in a significant shear deformation of asphalt pavement. At the same temperature, compressive stress decreases with the increasing of load and the deepening of the pavement structure. The influence of coupling effect of temperature and load is more significant than a single temperature or load factor. Under different coupling effect of temperature and load circumstances, the pavement structure influenced mostly by the shear stress is located 3-9cm underneath the surface.

Abstract: This paper presents a finite element analysis in order to determinate the stress distribution in an proposed model of the artificial cruciate ligament of the knee joint during the gait cycle.

Abstract: Based on the generalization and analysis of laboratory experimental results on mix ratio, the effects of various factors such as cement content, water-cement ratio, curing time, curing conditions and types of cement on the mechanical properties of unconfined compressive strength of cement soil are presented. Results show that the unconfined compressive strength of cement soil increases with the growing curing time, and it is greatly affected by the cement content, water-cement ratio, cement types and curing time, while the effect of curing conditions is weak with a cement content of more than 10%. Moreover, the stress-strain of the cement soil responds with the cement content and curing time, increasing curing time and cement content makes the cement soil to be harder and brittle, and leads to a larger Young's modulus.

Abstract: On the basis of the ultrasonic examination of concrete filled steel tube Pylon Bridge, comprehensive research and application analysis of nondestructive testing technology was carried out on the detection of micro-expansive concrete filled steel tube through the study of concrete filled steel tubular column (experimental section), which provide a theoretical basis for the detection of this kind of concrete.

Abstract: According to the mechanical properties of paste filling body under special environment such as high temperature high humidity high stress and high airtight) in gob, mechanical properties of gangue-paste filling body was studied with the method of field core and laboratory test. The complete stress-strain curve of filling body under the condition of uniaxial and triaxial and the ultimate compressive strength under different confining pressure station were obtained through uniaxial and triaxial compression test. Six stages of uniaxial compression complete stress-strain curve (compression stage, elastic deformation stage, non-stable developing stages, plastic hardening stage, stress softening stage and residual deformation stage) were improved and developed. The deformation characteristics of filling body under triaxial compression were different from that under uniaxial compression. Namely the deformation of filling body under triaxial compression only appeared two deformation stages: linear deformation stage and plastic hardening stage, but had no softening stage basically under different confining pressures, which was benefit for controlling the ground subsidence and preventing the ground buildings.

Abstract: Carried on finite element analysis using the UG software to finally carry on the fatigue life’s computational method to carry on the exploration and the research. when carrying on the finite element stress strain analysis to the piston pin, used the different analysis method, because the piston pin’s quality is very slightly oppositeing to the piston quality, produces the force of inertia is very small, the counter stress computed result is not very obvious, therefore to piston pin finite element analysis we uses conventional algorithm that infliction boundary condition.

Abstract: Set the raw coal samples of zhaogu mine in Jiaozuo as the object of study, with a self-developed equipment for thermo-fluid-solid-stress coupling of coal containing methane, analyse the relationship between permeability of raw coal samples and the change of effective stress, resultant stress strain process of raw coal samples. Experimental results show that The permeability of coal samples have stress sensitivity, permeability represents nonlinear decreasing relationship with effective stress increasing, Possess the law of negative exponent,This is consistent with the results of previous studies. During the full stress-strain process, strain increases with the stress increasing, penetration rate changed with the strain of the coal sample Increase after reducing ,on compaction stage stage and elastic deformation stage, transfusion decreased with stress increased , on yield deformation stage, permeability of coal samples reached minimum and began to overtake, on brittle break stage and residual strength stage, permeability increased by a large margin, mainly due to the coal macroscopic fissures.

Abstract: One-way fluid-solid interaction analysis of a centrifugal compressor has been investigated by aerodynamic and finite-element method in this paper. An accurate three-dimensional flow passage model of the compressor has been created;the stress distribution of the main flow path has been obtained. The aerodynamic force was applied to the impeller blades. Finally, three kinds of loads were applied to the main blades and splitter blades. Intensive study of thestrength characteristic of the blades has been made.

Abstract: Stress and deformation properties and hydraulic fracturing are key problems to designing and constructing of high earth-rock dam. In order to research characteristics of the stress and deformation properties of composite geo-membrane high earth-rock dam, the non-linear FEM is applied to analyze the stress and deformation of a composite geo-membrane rock-fill dam with Duncan-Chang E-B Model, emphasis on the deformation and stress behaviors of dam body, with a composite geo-membrane high earth-rock dam as an example, to estimate the whether or not developing hydraulic fracturing. The calculation results show that the deformation and stress behaviors of dam body and composite geo-membrane are in the normal state, composite geo-membrane has an evident effect on reduce embankment seepage, decrease pore water pressures and saturation line of embankment dam, to prevent dam produced hydraulic fracturing.

Abstract: Base on the micro-structure of self-healing 2.5D-C/SiC composite, a new mechanical model was established, By changing the tensile strength of matrix and volume fraction of boron carbide, the tensile behavior of self-healing 2.5D-C/SiC composite in weft direction was studied. The result shows that the increase of volume fraction of boron carbide has little influence on the tensile behavior in weft direction, and the influence is primarily due to the change of the tensile strength of matrix.