Numerical Simulation Of Thermal Field Research Articles

Numerical Simulation of Thermal Field and Performance Study on H13 Die Steel-Based Wire Arc Additive Manufacturing

In order to explore the relationship between welding thermal cycles and the thermal field during the repair process of dies, a numerical simulation software (SYSWELD) was employed to construct a thermo-mechanical coupled model. The influence of various inter-layer cooling times was investigated on heat accumulation, residual stress, and deformation of the repaired component. The results showed that the numerical simulation results agreed well with experimental data. The temperature within the cladding layer gradually rose as the number of weld beads increased, leading to a more pronounced accumulation of heat. The residual stress exhibited a double-peak profile, where the deformation of the repaired component was large at both ends but small in the middle. The less heat was accumulated in the cladding layer with a prolonged cooling time. Meanwhile, the residual stress and deformation in the repaired component experienced a gradual decrease in magnitude. The numerical simulation results demonstrated that the microstructure of the repaired component predominantly consisted of martensite and residual austenite at the optimal cooling time (300 s). Furthermore, the microhardness and wear resistance of the cladding zone significantly surpassed those of the substrate. In conclusion, this study suggested the prolonged cooling time mitigated heat accumulation, residual stress, and deformation in repaired components, which provided a new direction for future research on the die steel repairments.

Numerical Simulation of Thermal Field in Mass Concrete With Pipe Water Cooling

Water pipe cooling is mainly used to control temperature in the construction of mass concrete structures. It is important to reveal how to accurately stimulate the temperature field of mass concrete under action of this water pipe cooling. This paper presents a new method for this purpose. In this method, the contact surface of the water pipe and the concrete is used as the heat dissipation surface into the control equation and the composite Multiquadrics radial basis function (MQ-RBF) and low-order linear polynomial combination are used to discrete the spatial domain. The heat dissipation surface of the water pipe is included in the boundary conditions so that there is no need to build the refined water pipe modeling. This new method not only reduces the calculation cost but also ensures calculation accuracy. Through four calculation examples, this paper show that the algorithm has advantages in the numerical simulation of the concrete temperature field with water pipe cooling.

Numerical Simulation of Thermal Field of Work Roll during Top Side-pouring Twin-roll Casting of Steel

Numerical Simulation of Thermal Field of Work Roll during Top Side-pouring Twin-roll Casting of Steel

Numerical simulation of thermal field and Fe-based coating doped Ti

The aim of this paper is to simulate the thermal field in laser cladding process, especially the temperature variation, the cooling rate and the ratio of temperature gradient to solidifying rate (G/R) in solid–liquid interface. In this study, a 3D thermal FEM is established using birth and death element technique, and able to achieve temperature distribution with varying combinations of process parameters. Subsequently, the instantaneous temperature distribution and temperature curves were obtained, the cooling rate of fixed nodes was calculated. Then, for investigating the complexity process of molten pool solidification, the solidifying and cooling rate of moving solid–liquid interface have been analyzed and calculated systematically. Also, the G/R of moving solid–liquid interface has been deduced. Finally, the simulated results have been validated by the experimental phenomena, and it shows the effectiveness and feasibility of the model.

Numerical Simulation of Thermal Field in Subgrade of Passenger Dedicated Railway Line in Cold Region

Based on the background of the subgrade in Dalian of Dalian-Haerbin Passenger Dedicated line and combined the local climate condition and geological data, the thermal field in subgrade was simulated by finite element software, and the distribution of thermal field in subgrade of different month in winter and different years were analyzed. The results indicated that: The main areas of subgrade appeared negative temperature in winter, and the sunward and shady aspect should be considered in the distribution of thermal field in actual analysis. The negative temperature of thermal field in subgrade decreased with the increasing of the years in the same period, and the global warming have a significant effect on the distribution of thermal field.

Numerical Simulation of Thermal Fields Within Earth Surface Layers in the Region of South Urals

A mathematical model of thermal conductivity within the Earth near-surface layers has been studied in stationary mode relative to South Ural region. A purpose of the work is to identify cause of local heat flow density anomalies observed on the surface. Reconstruction of thermal field and heat production field is represented as numerical solution of the variational problems formulated according to boundary observation data

Numerical simulation of transient thermal field in laser melting process

Numerical simulation of thermal field was studied in laser processing. The 3-D finite element model of transient thermal calculation is given by thermal conductive equation. The effects of phase transformation latent are considered. Numerical example is given to verify the model. Finally the real example of transient thermal field is given.