Finite Element Analysis Of Temperature Field Research Articles

Spatial distribution characterization of the Temperature-induced gradient viscoelasticity inside asphalt pavement

Under the influence of continuous periodic changes of various meteorological factors, there will be an inhomogeneous temperature field inside the asphalt pavement, which will cause a continuous gradient viscoelasticity of asphalt concrete with depth. In order to perform the structural mechanics analysis accurately, the temperature field gradient effect and the temperature-induced gradient viscoelasticity distribution inside the asphalt pavement should be revealed first. In this research, based on the heat conduction theory, a temperature field finite element analysis (FEA) model of a semi-rigid base asphalt pavement was established to investigate the distribution behavior of the temperature gradient along the depth. Dynamic modulus tests were conducted to survey temperature effect on the viscoelastic parameters of asphalt concrete. Eventually, the intrinsic relationship between temperature, depth, and viscoelastic parameters was integrated, and the relaxation time shift method was proposed to quantitatively characterize the temperature-induced gradient viscoelasticity at different depths. It is found that the temperature varies in a cubic parabolic fashion along the depth under the most significant positive and negative temperature gradient conditions. The relaxation time shift method can be effectively used to characterize the distribution of the relaxation modulus and relaxation time spectrum of asphalt concrete under the influence of temperature. It is easy to be programmed to fully consider the inhomogeneous temperature field, and applicable to both traditional and gradient FEA. The change of parameters of generalized Maxwell model for asphalt concrete with temperature is essentially the result of relaxation spectrum shifting along the relaxation time axis at different temperatures. When the temperature is high, the viscosity decreases, the relaxation spectrum shifts to the direction of decreasing relaxation time, the relaxation modulus of asphalt concrete decreases, and vice versa.

Iron Temperature Field Finite Element Analysis and Measurement Verification

We often need to be in a work of finite element analysis of temperature field, but for the results of the analysis data, we seldom verified. This article through to the sample temperature field finite element analysis, then experimental measurement, verifies the correctness of the finite element analysis.

Thermal Deformation in a Static Pressure Dry Gas Seal

Based on the basic principles of heat transfer, the two-dimensional stable state cylindrical coordinate solid heat conduction differential equation having no inner heat source is established. Use the ANSYS software to establish the temperature field finite element analysis model of rotating and stationary rings and carry on the solution to the temperature field. The temperature distributing rules of rotating and stationary rings are obtained at the same time. According to thermo-elastic deformation theory, numerical analysis method and separation method are applied to resolve and analyze thermal-structural coupling deformation of rotating and stationary rings.

Strip Insulating Layer in Tunnel in Cold Region and its Temperature Field Analysis

Strict waterproof is the key to prevent frost damage to tunnel in the cold region. Improving drainage system has benefits to obtain good waterproof effect. Aim at the drain pipe freeze in cooling and warming period, we design a strip partial insulating layer to the drainage system :(1) The girth drainage pipe connects to the central drainage pipe directly, and the lengthways drainage pipe connects to the girth drainage pipe by tee. (2) Interval decorating insulation layer to the tunnel girth drainage pipe, using the strip insulation layer behind the lining and setting annular insulation around drainage pipe under the tunnel road. (3) The strip insulation layer is sandwiched by two layers of flashing; one of them forms a whole system with the tunnel flashing and the other posts on its surface. The temperature field finite element analysis of surrounding rock and lining concrete show that: As the girth drainage pipe if there is insulation layer is placed with a certain interval between each other. Two kinds of drain pipe's freeze-thaw state has a time gap. It is beneficial to solve the problem of the poor drainage after the lining in the cooling and warming period.

The Temperature Field Finite Element Analysis and Simulation of One Kind of Magnetic Agitation System

A magnetic beads agitation device is given based on electromagnetic MEMS. The micro planar coil which is used for controlling the magnetic beads in the device will generate heat, and the heat will directly affect the reaction droplet’s temperature, even lead the failure of the reactants and enzymes. Against this problem, the mathematical model for temperature field analysis of magnetic beads agitation device is established based on three-dimensional transient heat balance equation, boundary conditions of radiation and convection; and then the finite element model for the magnetic beads agitation device is established; in the end, simulation and calculation of temperature field distribution of the device are done in different load, and the simulation results are coincident with the existing literature’s experimental results ,which verified the correctness of this analysis method.

The Temperature Field Finite Element Analysis of Concrete Beam after Fire Based on ABAQUS

Based on ABAQUS software platform, the author analyzed the concrete beam’s temperature field by the finite element numerical simulation technology,and got the temperature field and the measuring temperature-time curve for the beam of different sections.The calculated results made a perfect coincide with on-site test ,which proved that ABAQUS simulated temperature field of concrete component has certain precision .Thus, the results provided the references for those who want to do more in-depth studies of the concrete beam’s mechanical properties after fire and reinforcement design.