Simulation of Temperature Field and Thermal Stress Field during Laser Drilling

2012 ◽  
Vol 217-219 ◽  
pp. 2226-2229
Author(s):  
Xue Jun Chen ◽  
Qi Liu
Keyword(s):  
Temperature Field ◽  
Thermal Stress ◽  
Stress Field ◽  
Laser Drilling ◽  
Transient Temperature ◽  
Drilling Process ◽  
Transient Temperature Field ◽  
Element Simulation ◽  
Thermal Stress Field ◽  
Dimensional Parameters

In this paper, the finite element simulation of laser drilling process has been carried out for the nickel alloy DD6. Both the transient temperature field and thermal stress field were computed via the commercial software package ANSYS. Based on the method of dimensional analysis, the dependence of various non-dimensional parameters on both fields was specified and demonstrated in graphical forms.

Cooling Effects of H-Beam after Rolling on Thermal Stress

2014 ◽  
Vol 898 ◽  
pp. 233-236
Author(s):  
Jin Hong Ma ◽  
Xiao Han Yao ◽  
Bin Tao ◽  
Shuo Li
Keyword(s):  
Temperature Field ◽  
Thermal Stress ◽  
Stress Field ◽  
Three Dimensional ◽  
Transient Temperature ◽  
Controlled Cooling ◽  
Fem Model ◽  
Transient Temperature Field ◽  
Cooling Effects ◽  
H Beam

Controlled cooling of H-beam after rolling, can change the microstructure consituent,improve the strength and improve the general mechanical property and service performance. According to actual product, the rational thermal boundary condition adopted, three dimensional FEM model is established. Spray cooling is used. Transient temperature field and stress field is simulated by the FEM software ANSYS/Multiphysics when H-beam is cooled. The four kinds of cooling scheme are designed. Through analysis of the relation of temperature field with stress field, the main reason of producing residual thermal stress is the section temperature difference in the cooling process of H-beam after rolling.

FEM Study of Thermal Stress Field of Wheel under Typical Braking Condition

2013 ◽  
Vol 378 ◽  
pp. 51-54
Author(s):  
Ping Wang ◽  
Wei Li ◽  
Wen Chen ◽  
Dong Ming Wang
Keyword(s):  
Thermal Stress ◽  
Stress Field ◽  
Tensile Stress ◽  
Transient Temperature ◽  
Emergency Braking ◽  
Transient Temperature Field ◽  
Thermal Stress Field ◽  
Actual Load ◽  
Element Theory ◽  
Load Conditions

Based on actual load conditions, the transient temperature field and thermal stress field of rail wheel under the conditions of service braking, emergency braking and ramp braking are calculated by means of the finite element theory. As a result, the inner side of web hole is in a prolonged condition of tensile stress, while the outside of web hole is in the condition of compressive stress, where the value of tensile stress is maximal under ramp braking. Furthermore, the value of thermal stress for worn 20mm wheel is obviously higher than that for non-worn wheel.

Study on the Thermal Stress Field of Steel 1045 Quenched by Water

2011 ◽  
Vol 255-260 ◽  
pp. 3568-3572
Author(s):  
Jian Bin Xie ◽  
Tian Chun He ◽  
He Ming Cheng
Keyword(s):  
Temperature Field ◽  
Thermal Stress ◽  
Stress Field ◽  
Volume Fraction ◽  
Transient Temperature ◽  
Thermal Stress Field ◽  
Study Results ◽  
Quenching Process ◽  
Non Linear ◽  
1045 Steel

In this paper, based on the experimental measured cooling curves, it was solved that the inverse problem of non-linear heat conduct equation for Steel 1045 quenched by water using finite difference method and nonlinear estimate method. The volume fraction of constituent of austenite, pearlite, bainite, martensite and the non-linear surface heat-transfer coefficients in continuous cooling during quenching were calculated and simulated by mathematical transformation. The volume fraction of phase constituents in the quenched work piece of 1045 steel was tested subsequently. Then the temperature field and thermal stress field of Steel 1045 cylinder during water quenching was simulated by ANSYS. The study results show that the 2D transient temperature field of the cylinder specimen calculated by ANSYS during quenching coincides with the practical quenching process, and the results of thermal stress field simulated by ANSYS can guide quenching process.

Investigation on Temperature Field and Thermal Stress of Dish Solar Concentrator’s Focal Region

2011 ◽  
Vol 148-149 ◽  
pp. 20-23
Author(s):  
Xing Zhi Wang ◽  
Yong Shuai ◽  
Fu Qiang Wang ◽  
Chun Liang Yu
Keyword(s):  
Temperature Field ◽  
Thermal Stress ◽  
Stress Field ◽  
Infrared Camera ◽  
Radiant Heat ◽  
Focal Region ◽  
Solar Concentrator ◽  
Flux Function ◽  
Thermal Stress Field ◽  
Good Accordance

Depending on the solar radiant flux and velocity measured in Harbin, with finite element method, use a modified radiant heat flux function to calculate the temperature field of a plate on the focal region of a dish solar concentrator. Compared the result with picture taken by infrared camera, there is a good accordance between them. The temperature field is used as the loading parameters to calculate the thickness’s impact on the thermal stress field in the plate. When the value of the thickness increases, the maximum values of the stress increase, but the overall stress field tend to decrease.

Study on the Influence of Temperature and Stress Field to PCB’s Modal

2012 ◽  
Vol 271-272 ◽  
pp. 1441-1445
Author(s):  
Qin Luo ◽  
Su Juan Zhang ◽  
Xiao Zhang
Keyword(s):  
Temperature Field ◽  
Stress Field ◽  
Modal Analysis ◽  
Heat Flux Density ◽  
Heat Dissipation ◽  
Transient Temperature ◽  
Electronic Products ◽  
Transient Stress ◽  
Transient Temperature Field ◽  
Pcb Design

With the increasing integration of electronic products, the heat flux density is increasing. Research on the heat dissipation of the PCB attracts more attention. Temperature field of the electronic products always changes a lot, usually leading to a transient stress field in the PCB. Due to the transient temperature field and transient stress field, the PCB’s modal changed. In this paper, the temperature field and the stress field are obtained to explain the reason of the change. The influence on PCB’s modal caused by the temperature field and the stress field are analyzed, on the basis of PCB’s thermal modal analysis, which provide a reference for the PCB design and modal analysis in the future.

The Transient Temperature Field Simulation and Analysis of Machinery’s Components by ABAQUS

2014 ◽  
Vol 941-944 ◽  
pp. 2420-2424 ◽  
Author(s):  
Jian Xiang Sun ◽  
Wei Jiang Xu
Keyword(s):  
Temperature Field ◽  
Transient Temperature ◽  
Temperature Field Distribution ◽  
Field Simulation ◽  
Transient Temperature Field ◽  
Thermal Stress Field ◽  
Standard Component ◽  
Quenching Process ◽  
Quenching Time ◽  
Abaqus Software

By using the Abaqus software, FEM calculation of the quenching process of non-standard component which has complex contour has been operated, the temperature field distribution which accompanies the quenching time has been obtained. The simulation process’s precision and efficiency is excellent, this method is applicable to the quenching technics’s improvement, and can offer the calculation basis to the analysis of the thermal stress field and residual stress. It can also provide the improving scheme for the intensity design of the coal winning machinery.

Numerical Analysis of Transient Temperature Field and Thermal Stress on Coke Drum With 1.25Cr-0.5Mo Steel Based on Iterative Algorithm

2017 ◽  
Author(s):  
Zhibing Lu ◽  
Xuedong Chen ◽  
Zhichao Fan ◽  
Jie Dong ◽  
Jinhua Zhu
Keyword(s):  
Temperature Field ◽  
Thermal Stress ◽  
Iterative Algorithm ◽  
Thermal Structure ◽  
Transient Temperature ◽  
Main Process ◽  
Measured Temperature ◽  
Operating Cycle ◽  
Transient Temperature Field ◽  
Variation Characteristics

Coke drum is typical industrial equipment which experiences complex thermal and mechanical cyclic load during its operation, and the thermal stress which is produced by the drastic change of temperature is the main cause of the cracking failure of coke drum. This paper aims at coke drum with 1.25Cr–0.5Mo steel, and is based on iterative algorithm. Then we simulate the process of liquid medium climbing the inner surface of coke drum in the stages of oil filling and water quenching with dynamic thermal boundary, and carry out the numerical calculation of transient temperature field of coke drum in main process stages for one operating cycle. After the comparison of simulated temperature values with the measured temperature data at several locations on the outer surface of coke drum, the appropriate equivalent coefficients of convective heat transfer will be obtained. The variation rules of transient temperature field for the key parts of coke drum are discussed. Based on the simulation results of temperature field, the thermal-structure coupling analysis of coke drum is carried out, and the variation characteristics of thermal stress on coke drum are studied later.

Laser-Induced Thermal Damage to K9 Glass on Finite Element Method

2013 ◽  
Vol 444-445 ◽  
pp. 1422-1426
Author(s):  
Li Zi Chen ◽  
Chun Yuan Jing ◽  
Xiao Wei Guan
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Thermal Stress ◽  
Stress Field ◽  
Thermal Damage ◽  
Laser Damage Threshold ◽  
Element Analysis ◽  
Finite Element Software ◽  
Thermal Stress Field ◽  
K9 Glass

Based on the theory of the thermal conduction and the thermal elastic equations, does some researches in view of the thermal Damage of K9 glass by finite element analysis. The distribution of temperature field and thermal stress field of the ideal K9 glass which irradiated by 100W pulsed-Nd: YAG laser are simulated with finite element software. The result shows that the temperature of the surface of glass doesnt reach the melting and the thermal stress of it doesnt get to the requirement for fracture strength. Then, the model of K9 glass containing inclusions has be built. The simulation result indicates that inclusions may affect the distribution of temperature field and thermal stress field of the K9 glass, which makes the injected laser beams energy centralize on a small area around the inclusions owing to the existence of the strong absorbing, thus leading to K9 glass laser damage threshold reduction and easier to thermal damage.

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