scholarly journals Numerical simulation and analysis of the temperature effect on the fission of concrete

2019 ◽  
Vol 23 (5 Part A) ◽  
pp. 2713-2720 ◽  
Author(s):  
Guangcheng Liu
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Numerical Calculation ◽  
Temperature Control ◽  
Surface Stress ◽  
Simulation Method ◽  
Concrete Surface ◽  
Effect Of Temperature ◽  
Insulation Material ◽  
Maximum Surface

In order to further improve the crack resistance of concrete engineering, a numerical simulation method is constructed to study the effect of temperature on the fission of concrete. Based on the finite element method, the mathematical model is constructed, and the numerical calculation and image display are used to simulate and analyze the engineering problems. The temperature sensor is used to observe the whole variation law of typical temperature field, and the temperature of concrete entering and pouring is obtained. Thus, the temperature control real-time automatic acquisition system is set up. According to the temperature field and temperature stress distribution rules, the ideal temperature control curve model of concrete is proposed. Finally, the numerical calculation and experiment of the model are carried out. The results show that the maximum surface stress level decreases in varying degrees after different surface insulation measures are taken, and if the thermal insulation material?s ? ? 10 kJ/m2h?, the maximum surface stress of concrete can be reduced to 0.06~0.14 MPa. In this paper, it is shown that the negative effect of the large diurnal temperature difference on concrete surface insulation can be controlled.

Experimental and numerical investigation of the thermomechanical load on a turbine housing in a radial turbocharger

2021 ◽  
pp. 095440702110521
Author(s):  
Shaolin Chen ◽  
Hong Zhang ◽  
Liaoping Hu ◽  
Guangqing He ◽  
Fen Lei ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Fatigue Life ◽  
Simulation Analysis ◽  
Simulation Method ◽  
Testing Temperature ◽  
Experimental Results ◽  
Maximum Temperature ◽  
Monitoring Point ◽  
Turbine Housing

The fatigue life of turbine housing is an important index to measure the reliability of a radial turbocharger. The increase in turbine inlet temperatures in the last few years has resulted in a decrease in the fatigue life of turbine housing. A simulation method and experimental verification are required to predict the life of a turbine housing in the early design and development process precisely. The temperature field distribution of the turbine housing is calculated using the steady-state bidirectional coupled conjugate heat transfer method. Next, the temperature field results are considered as the boundary for calculating the turbine housing temperature and thermomechanical strain, and then, the thermomechanical strain of the turbine housing is determined. Infrared and digital image correlations are used to measure the turbine housing surface temperature and total thermomechanical strain. Compared to the numerical solution, the maximum temperature RMS (Root Mean Square) error of the monitoring point in the monitoring area is only 3.5%; the maximum strain RMS error reached 11%. Experimental results of temperature field test and strain measurement test show that the testing temperature and total strain results are approximately equal to the solution of the numerical simulation. Based on the comparison between the numerical calculation and experimental results, the numerical simulation and test results were found to be in good agreement. The experimental and simulation results of this method can be used as the temperature and strain (stress) boundaries for subsequent thermomechanical fatigue (TMF) simulation analysis of the turbine housing.

Effect of Temperature Induced by Laser Irradiation Processing on Fatigue Damage Repairing for Copper Thin Film

2013 ◽  
Vol 750-752 ◽  
pp. 2074-2077
Author(s):  
Lu Wang ◽  
De Guang Shang ◽  
Chong Gang Ren ◽  
Yu Bo Guo ◽  
Tao Chen
Keyword(s):  
Thin Film ◽  
Temperature Field ◽  
Laser Irradiation ◽  
Fatigue Damage ◽  
Simulation Method ◽  
Optical Microscope ◽  
Laser Surface ◽  
Effect Of Temperature ◽  
Copper Thin Film ◽  
Before And After

Based on laser irradiation processing experiment for repairing damaged copper thin film specimens, the effect of temperature field induced by pulsed laser surface irradiation on fatigue damage repairing of copper thin film was studied by numerical simulation method. First the temperature field of copper thin film after laser irradiation was analyzed by ANSYS under different pulse energies and pulse numbers. Then the surface morphologies of copper thin film specimens were observed by optical microscope before and after laser surface irradiation. The results showed that laser irradiation processing has a better effect on fatigue damage repairing when the temperature induced by laser surface irradiation reaches about 1200 °C. A slightly melted morphology on the surface of copper thin film was observed in this case. In addition, except for the full healing of fatigue damage, the total fatigue life was increased about 2 times at the nominal stress level of 120MPa.

scholarly journals Research on Model Slice and Forming Method of Thin-walled Parts

2021 ◽  
Vol 233 ◽  
pp. 04046
Author(s):  
Changhao Zhang ◽  
Hu Li ◽  
Jianyu Yang ◽  
Huawei Lu ◽  
Peng Su
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Structural Characteristics ◽  
Three Dimensional ◽  
Simulation Method ◽  
Processing Parameters ◽  
Transient Temperature ◽  
Transient Temperature Field ◽  
Thin Walled ◽  
Experimental Processing

According to the structural characteristics of thin-walled parts, a model slicing method is proposed, and its mathematical process is established. The three-dimensional transient temperature field in the process of synchronous powder feeding laser cladding is studied and verified by numerical simulation method, and the thin-walled parts formed by later experimental processing are processed by the results of numerical simulation. Using the simulation results of temperature field as the basis for optimizing the processing parameters, the forming path of thin-walled parts is programmed and optimized, and the experimental verification shows the reliability of this method.

scholarly journals Study on the Effect of Cable Group Laying Mode on Temperature Field Distribution and Cable Ampacity

Energies ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 3397 ◽  
Author(s):  
Lan Xiong ◽  
Yonghui Chen ◽  
Yang Jiao ◽  
Jie Wang ◽  
Xiao Hu
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Field Distribution ◽  
Simulation Method ◽  
Power Cable ◽  
Measured Temperature ◽  
Air Velocity ◽  
Temperature Field Distribution ◽  
Numerical Simulation Method ◽  
Online Monitor

The reliability and service life of power cables is closely related to the cable ampacity and temperature rise. Therefore, studying the temperature field distribution and the cable ampacity is helpful to improve the construction guidelines of cable manufacturers. Taking a 8.7/15 kV YJV 1 × 400 XLPE three-loop power cable as the research object, cable temperature is calculated by IEC-60287 thermal circuit method and numerical simulation method, respectively. The results show that the numerical simulation method is more in line with the actual measured temperature, and the relative error is only 0.32% compared with the actual measured temperature. The temperature field and air velocity field of cluster cables with different laying methods are analyzed by finite element method. The corresponding cable ampacity are calculated by secant method. The results show that when the cable is laid at the bottom of the cable trench, the cable current is 420 A, which is 87.5% of the regular laying. Under irregular laying mode, the temperature of cable is higher than that of regular laying mode and the cable ampacity is lower than that of regular laying mode. At the same time, a multiparameter online monitoring system is developed to online monitor the temperature, water level and smoke concentration of the cable.

Coupling Effect of Temperature Stress in Butterfly Valve Mechanical System Based on FLUENT Numerical Simulation

2014 ◽  
Vol 716-717 ◽  
pp. 702-706
Author(s):  
Xiao Zhi Wang ◽  
Hong Hui Zhu ◽  
Zhi Gang Liu
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Mechanical System ◽  
Coupling Effect ◽  
Three Dimensional ◽  
Effect Of Temperature ◽  
Joint Control ◽  
Butterfly Valve ◽  
Simulation Accuracy ◽  
Valve System

The butterfly valve system is an important part of the steel heating furnace temperature control. In high temperature, the coupling effect of temperature field and stress deformation of the butterfly valve is stronger. We did not consider it in the numerical simulation research in the past, and studied the overall characteristics of butterfly valve only by 2D numerical simulation, resulting in the decrease of the numerical simulation accuracy. This paper uses the way of the FLUENT software and ANSYS software joint control, and has established the mathematical model of fluid and solid coupling effect, and has implemented the coupling effect of the temperature field and stress field of the butterfly valve system by means of three dimensional numerical simulation, then we have got the temperature distribution and stress distribution of the butterfly valve system, which provides technical reference for mechanical system design of butterfly valve.

Analytical Method of the Rolling Resistance of Radial Tire Base on ANSYS

2012 ◽  
Vol 501 ◽  
pp. 259-262
Author(s):  
Ze Peng Wang ◽  
Jia Na Ke ◽  
Lian Xiang Ma
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Fuel Economy ◽  
Structural Design ◽  
3D Model ◽  
Rolling Resistance ◽  
Element Model ◽  
Simulation Method ◽  
Radial Tire ◽  
Analytical Result

Rolling resistance can impact on the fuel economy and dynamics of automobile. Numerical simulation can predict the rolling resistance and reduce the experimental cost. So, a simulation model was established base on ANSYS to compute the rolling resistance. Firstly, the 3D model finite element model of a radial tire was setup to solve the strain and stress of a rolling tire. Secondly ,the temperature field of tire was analyzed in line with the analytical result of the strain and stress. Thirdly, the rolling energy loss was calculated to solve the rolling resistance. The simulation method is conducive to the structural design of tire and computation or prediction of the rolling resistance of tire.

Numerical Simulation of Cavity Flow within the Flow Field

2013 ◽  
Vol 712-715 ◽  
pp. 1259-1262
Author(s):  
Jian Yu Cai ◽  
He Juan Chen
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Flow Field ◽  
Centrifugal Pump ◽  
Calculation Method ◽  
Simulation Method ◽  
Cavity Flow ◽  
Mechanical Seal ◽  
Seal Ring ◽  
Temperature And Pressure

Analysis of numerical simulation was used on flow field and temperature field in mechanical seal cavity. It borrowed a new calculation method, which was more visual and simpler than before. And this method analysed the change in temperature field of mechanical seal ring and the distribution of temperature and pressure in the flow field when mechanical seal was working. The result showed that the numerical simulation method was effect to the flow field in centrifugal pump.

The Analysis of Temperature and Displacement Coupling in Freeze-Thaw Process of Soil

2011 ◽  
Vol 97-98 ◽  
pp. 192-198
Author(s):  
Shu Guang Hou
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Numerical Computation ◽  
Geometric Model ◽  
Simulation Method ◽  
Frozen Soil ◽  
Displacement Fields ◽  
Soil Frost ◽  
Freeze Thaw ◽  
Thaw Settlement

Through the coupling analysis of temperature and displacement fields in freeze-thaw process of soil by ABAQUS software, a numerical simulation method of the two fields coupling in freeze-thaw process of soil is put forward. In computation, the temperature field is analyzed firstly, and then the physico-mechanical parameters are defined as functions of temperature field. The geometric model and boundary conditions of numerical simulation are identical with these in laboratorial tests. By comparing the computation results of soil freeze-thaw process with its laboratorial test results, it was found that on the curve of soil freeze-thaw process obtained from laboratorial tests there is a short frost-swelling phenomenon at the initial stage of freeze-thaw process, and then is continuous thaw condition, but on the numerical computation curve, the reflect of soil frost swelling stage isn’t obvious. With the exception of this the numerical computation result and laboratorial test result are more identical. The frost-swelling quantum is very small, so the main expression of overall deformation of soil is thaw-settlement deformation. Therefore the frost swelling phenomenon doesn’t influence the end quantum of settlement. For this reason, the computing method introduced in this paper can be used to conduct numerical simulation of the thaw-settlement of frozen soil and to a certain extent guide the designs of subgrade and pavement in permafrost zones.

The Numerical Simulation of Reinforced Particle Stress Concentration in Al-Si Alloy Rolling

2015 ◽  
Vol 719-720 ◽  
pp. 55-58
Author(s):  
Yan Ling Zhao ◽  
Xue Song Yang ◽  
Zi Yan Yun ◽  
Hong Bo Wang ◽  
Guan Hong Xu
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Temperature Field ◽  
Stress Concentration ◽  
Hot Rolling ◽  
Element Model ◽  
Simulation Method ◽  
Tensile Tests ◽  
Temperature Filed ◽  
Edge Cracks

Aiming at the problem that temperature filed changes can lead to edge cracks emerge to Al-Si alloy 4004 in the process of hot rolling, in this paper, finite element model of temperature field variations in the process of rolling have been established by the method of finite element numerical simulation. The relationship between temperature field variations and edge crack defects has been analyzed. The results show that temperature field of rolled piece is gradient variations, low in the center and high in the edge, metal accumulation in the edge, leading to stress concentration and forming cracks source, resulting in edge cracks arising in edge of roller piece. Finally, the reliability and accuracy of the numerical simulation method have been verified by hot-rolled tests and tensile tests. All the studies provide ideas for theoretical analysis of temperature variation during hot rolling and have important significance on improve the quality of products.

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