Steady Thermal Stress in a Ceramic/FGM/Metal Composite EFBC Plate Considered Temperature Dependency

2010 ◽  
Vol 177 ◽  
pp. 231-234
Author(s):  
Yang Jian Xu ◽  
Dai Hui Tu ◽  
Jian Hui Jia
Keyword(s):  
Thermal Stress ◽  
Tensile Stress ◽  
Compressive Stress ◽  
Metal Surface ◽  
Material Properties ◽  
Metal Composite ◽  
Temperature Dependency ◽  
Stress Distributions ◽  
Maximum Compressive Stress ◽  
Fgm Layer

The steady thermal stress distributions and effect factors in a ceramic/FGM/metal composite EFBC plate with temperature-dependent material properties during heating process were investigated by the NFEM and the Sinpson method. From numerical calculation, when T0=Ta=300K and Tb=1 300K, the stress distributions in the plate were obtained. The results are as follows. With the increase of the FGM layer thickness, the stress distribution in the composite plate is more reasonable. Compared with M=0.1, when M=10, the compressive stress on the ceramic surface increases by 9.0%, and the tensile stress on the metal surface reduces by 17.9%. With the increase of FGM layer porosity, the variations of thermal stress curves become big. Compared with A=0, when A=3.99, the tensile stress on the metal surface increases by 65.5%, and the maximum compressive stress on the surface of ceramics reduces by 27.5%. Compared with the results of constant material properties, when we consider the temperature dependency of the material properties, the maximum tensile stress on the surface of metal in the plate reduces by 30.1%, and the maximum compressive stress on the surface of ceramics in the plate reduces by 9.49%. Compared with the nongraded two-layered plate, the tensile stress at middle of the graded three-layered composite EFBC plate reduces by 53.5%. When T0=300K, Ta=700K, compared with Tb=1 050K, when Tb=1 800K, the tensile stress on the surface of metal increases 563MPa, and the maximum compressive stress on the surface of ceramics increases 7.24 times.

Heating Steady Thermal Stress in a Composite EFBF Plate Made of Ceramic/FGM/Metal Considered Temperature Dependency

2009 ◽  
Vol 417-418 ◽  
pp. 537-540 ◽  
Author(s):  
Yang Jian Xu ◽  
Dai Hui Tu
Keyword(s):  
Thermal Stress ◽  
Tensile Stress ◽  
Compressive Stress ◽  
Composite Plate ◽  
Maximum Tensile Stress ◽  
Metal Composite ◽  
Temperature Dependency ◽  
Stress Distributions ◽  
Maximum Compressive Stress ◽  
Layered Ceramic

A NFE model is constructed to analyze the heating steady thermal stress in a ceramic/FGM/metal composite EFBF plate considered temperature dependency. From numerical calculation, when T0=Ta=300K and Tb=1 000K, the stress distributions in the plate were obtained. The results are as follows. With the increase of the FGM thickness, the stress distribution is more reasonable, and the largest tensile stress reduces by 45.64%. With the increase of M, the stress change increases obviously, and the compressive stress on the surface of ceramics reduces by 56.0%. Compared with A=0, the compressive stress of A=3.99 on the surface of metal increases by 94.2%, and the stress on the surface of ceramics changes from compressive stress to tensile stress. When T0=300K, Ta=700K, compared with Tb=1 050K, when Tb=1 800K, the compressive stress on the surface of metal increases 13.62 times, and the maximum compressive stress on the surface of ceramics increases 5.22 times. Compared with the two-layered ceramic/metal composite plate, the stress of ceramic/FGM/metal composite EFBF plate is very gentle, and the maximum tensile stress reduces by 44.2%. Compared with constant material properties, the maximum compressive stress on the surface of metal considered temperature dependency reduces by 59.1%. The results provide the foundations of theoretical calculation for the design and application of the composite plate.

Steady Thermal Stresses in a Ceramic/FGM/Metal Composite EFBC Plate under Convective Heat Transfer Boundary

2010 ◽  
Vol 150-151 ◽  
pp. 239-242
Author(s):  
Dai Hui Tu ◽  
Yang Jian Xu ◽  
Xiao Li Zhou
Keyword(s):  
Heat Transfer ◽  
Thermal Stress ◽  
Tensile Stress ◽  
Convective Heat Transfer ◽  
Compressive Stress ◽  
Metal Surface ◽  
Composite Plate ◽  
Metal Composite ◽  
Stress Distributions ◽  
Maximum Compressive Stress

The steady thermal stress distributions and effect factors in a ceramic/FGM/metal composite EFBC plate considered constant material properties under convective heat transfer boundary were investigated by the FEM and the Sinpson method. From numerical calculation, when , T0=300K, Ta=400K and Tb=1 400K, the stress distributions in the plate were obtained. The results are as follows. With the increase of the FGM layer thickness, the stress distribution in the composite plate is more reasonable. Compared with M=0.2, when M=5, the compressive stress on the ceramic surface reduces by 10.2%, and the tensile stress on the metal surface reduces by 21.7%. With the increase of A, the variations of thermal stress curves become big. Compared with A=0, when A=3.99, the tensile stress on the metal surface increases by 198.0%, and the maximum compressive stress on the surface of ceramics increases by 66.0%. Compared with the mutation of thermal stress at the cohesive interface of ceramic / metal two-layered composite plate, the thermal stress of ceramic/FGM/metal composite plate is very gentle. Compared with , when , the maximum tensile stress on the metal surface increases 1.44 times, and the maximum compressive stress on the surface of ceramics increases 1.50 times. The results provide the foundations of theoretical calculation for the design and application of the composite plate.

Convective Heat Transfer Steady Thermal Stress in a Ceramic/FGM/Metal Composite EFBC Plate with Temperature-Dependent Material Properties

2009 ◽  
Vol 79-82 ◽  
pp. 1363-1366 ◽  
Author(s):  
Yang Jian Xu ◽  
Dai Hui Tu
Keyword(s):  
Thermal Stress ◽  
Tensile Stress ◽  
Compressive Stress ◽  
Material Properties ◽  
Composite Plate ◽  
Maximum Tensile Stress ◽  
Metal Composite ◽  
Ceramic Surface ◽  
Temperature Dependent ◽  
Maximum Compressive Stress

A NFE model is constructed to analyze the convective heat transfer steady thermal stress in a ceramic/FGM/metal composite EFBC plate with temperature-dependent material properties. Based on thermoelasticity theory, we derive the NFE basic equation of heat conduction of the plate. We present a Sinpson method for the solution of steady thermal stress formulas of the composite plate. Using FORTRAN language we design the calculation software. From numerical calculation, when , T0=300K, Ta=500K and Tb=1 650K, the stress distributions in the plate were obtained. The results are as follows. With the increase of the FGM gradient layer thickness, the stress distribution is more reasonable, and the largest tensile stress of the EFBC composite plate reduces by 59.6%. With the increase of M, the stress change increases obviously in metal and ceramic layers, and the thermal compressive stress on the ceramic surface reduces by 78.1%. With the increase of porosity, the change of stress at the bonding interfaces increases, and the thermal compressive stress on the surface of ceramics reaches the maximum, and the thermal tensile stress on the surface of metal reaches the maximum too. Compared with , when , the tensile stress on the metal surface reduces by 91.3%, and the maximum compressive stress on the surface of ceramics increases 4.55 times. Compared with the nongraded two-layered ceramic/metal composite plate, the thermal stress of ceramic/FGM/metal composite EFBC plate is very gentle, and the maximum tensile stress reduces by 62.94%. When we consider the temperature-dependent material properties, the stress in graded three-layered composite plate becomes small obviously, and the maximum tensile stress in the plate reduces by 36.74%, and the maximum compressive stress on the ceramic surface reduces by 31.4%. The model can effectively analyze the thermal stresses and effect factors in a ZrO2/FGM/Ti-6Al-4V composite plate. The results provide the foundations of theoretical calculation for the design and application of the composite plate.

Thermal Stresses in a ZrO2/FGM/Ti-6Al-4V Composite ECBC Plate with Temperature-Dependent Material Properties

2010 ◽  
Vol 150-151 ◽  
pp. 873-876
Author(s):  
Dai Hui Tu ◽  
Yang Jian Xu ◽  
Jian Hui Jia
Keyword(s):  
Thermal Stress ◽  
Compressive Stress ◽  
Material Properties ◽  
Composite Plate ◽  
Thermal Stresses ◽  
Ceramic Surface ◽  
Stress Distributions ◽  
Temperature Dependent ◽  
Maximum Compressive Stress ◽  
Gradient Layer

The steady thermal stress distributions and effect factors in a ZrO2/FGM/Ti-6Al-4V composite ECBC plate with temperature-dependent material properties under convective heat transfer boundary were investigated by the NFEM and the Sinpson method. From numerical calculation, when , T0=300K, Ta=350K and Tb=1 750K, the thermal stress distributions in the composite FGM plate were obtained. The results are as follows. With the increase of the FGM gradient layer thickness and when M=1, the temperature distributions in the composite plate are more reasonable. With the increase of the FGM gradient layer M, the thermal stresses on the ceramic surface tend toward reduction, and compared with the thermal stress of M=0.2, the thermal stress of M =5 reduces by 17.8%. When we take into account the effect of temperature-dependent material properties, compared with the results of constant material properties, the maximum compressive stress on the surface of metal reduces by 74.2%, and the maximum compressive stress on the surface of ceramics reduces by 45.3%. With the increase of FGM layer porosity P, the change of stress at the bonding interface of the three-layered plate increases, and the stress curves appear peak values. Compared with A=0, when A=3.99, the compressive thermal stress on the metal surface reduces by 42.0%, and the compressive thermal stress on the ceramic surface increases by 154.7%. Compared with the nongraded two-layered ceramic/metal composite plate, the thermal stress of the ZrO2/FGM/ Ti-6Al-4V composite plate is very gentle. Compared with , when , the maximum compressive stress on the surface of metal reduces by 49.98%, and the maximum compressive stress on the surface of ceramics increases by 182.3%. The results provide the foundations of theoretical calculation for the design and application of the composite plate.

Lateral grain growth in poly-Si films by gas flame high temperature annealing

1996 ◽  
Vol 441 ◽  
Author(s):  
W. F. Qu ◽  
A. Kitagawa ◽  
Y. Masaki ◽  
M. Suzuki
Keyword(s):  
High Temperature ◽  
Tensile Stress ◽  
Compressive Stress ◽  
Grain Growth ◽  
Strain Energy ◽  
Driving Forces ◽  
Stress Distributions ◽  
High Temperature Annealing ◽  
Gas Flame ◽  
Si Films

AbstractPoly-Si films with the preferential orientation to a random, a (100) and a (110) texture were annealed using a flat gas flame. Remarkable lateral grain growth of (111) grains was observed for poly-Si films with a random and a (110) texture, while in (100) texture films the growth of (100) grains predominated over other grains. There existed tensile stress in as-prepared films. Grains with different orientation were under a different tensile stresses, and such stress distributions on the orientation of grains were different for different textures. The tensile stress was found to become larger in grown grains after high temperature annealing, while the stress on shrunken grains decreased or turned to compressive stress after annealing. These results indicate that strain energy stored in grains is one of the important driving forces in secondary grain growth.

scholarly journals Reliability Analysis of Resultant Stress for Unsymmetrical Columns for Stress Follow Exponential Distribution

2019 ◽  
Vol 8 (6S3) ◽  
pp. 1334-1337
Keyword(s):  
Tensile Stress ◽  
Reliability Analysis ◽  
Compressive Stress ◽  
Probabilistic Approach ◽  
Bending Stress ◽  
Maximum Compressive Stress ◽  
Eccentric Load ◽  
Component Reliability ◽  
Parameter Values ◽  
Resultant Stress

When a body is subjected to eccentric loads, the direct stress as well as bending stress is produced. Resultant stress is obtained by adding these two stresses. In this paper, probabilistic approach has been made for designing the structure of unsymmetrical column by finding suitable parameters length of outer square and length of a hole and eccentric load of the column to get the specified reliability of the structure of a body or component. Reliability analysis has been done at the point of maximum compressive stress occurred and at the point of minimum tensile stress occurred. Reliability computations have been obtained for changing the various parameter values. It is observed from the computations that Reliability of the component when compressive stress occurs at the edge AB increases with increasing of length of outer square, decrease of load, decrease of length of hole and increasing of eccentricity. Reliability of the component when tensile stress occurs at the edge CD increases with decrease of length of outer square increasing the length of a hole, decreases the load and decrease of eccentricity

scholarly journals Analysis on accumulated deformation and stress of the steel roof of Beijing Opera House during construction

2021 ◽  
Vol 2045 (1) ◽  
pp. 012014
Author(s):  
L L Wu ◽  
G Gao ◽  
B R Ye ◽  
H D Zhang ◽  
Q Lu
Keyword(s):  
Tensile Stress ◽  
Compressive Stress ◽  
Vertical Displacement ◽  
Maximum Tensile Stress ◽  
Design Model ◽  
Construction Process ◽  
Maximum Compressive Stress ◽  
Finite Element Software ◽  
Stress And Deformation ◽  
Steel Roof

Abstract This paper aims to study the stress and deformation of large steel structure buildings in the actual construction process. Midas Gen finite element software is used to simulate and analyze the whole construction process of the curved reticulated shell roof, the peripheral steel columns and the permanent support. The stress and deformation results of the structure in the final construction state are compared with those in the design state under one-time loading. The results show that, in the final construction state, the maximum tensile stress and the maximum compressive stress are 1.9 times and 2.0 times of that in the design state under one-time loading respectively, which is very significant. When the design model is loaded with weight at one time, the maximum tensile stress and the maximum compressive stress of the structure both appear near the opening of the steel roof, while in the final construction state, the maximum tensile stress of the structure appears near the boundary frame beam, and the maximum compressive stress appears on the main ridge beam. The maximum vertical displacement of the structure in the final construction state is 2.0 times of that when the design model is loaded at one time. The maximum vertical displacement of the design state appears near the opening of the steel roof, while the maximum vertical displacement of the structure in the final construction state appears on the main ridge beam. In view of the above, the effective guidance for the construction of steel roof structure is provided in this paper to ensure the safety of the structure.

scholarly journals Modeling and Simulation of Nanofluid Minimum Quantity Lubrication Surface Grinding Thermal Stress

2015 ◽  
Vol 9 (1) ◽  
pp. 761-768 ◽  
Author(s):  
Yanbin Zhang ◽  
Changhe Li ◽  
Min Yang ◽  
Dongzhou Jia ◽  
Dongkun Zhang ◽  
...  
Keyword(s):  
Thermal Stress ◽  
Tensile Stress ◽  
Compressive Stress ◽  
Minimum Quantity Lubrication ◽  
Surface Grinding ◽  
Slight Variation ◽  
Cutting Depth ◽  
Finished Surface ◽  
Nanofluid Minimum Quantity Lubrication ◽  
Large Tensile Stress

The model of surface grinding with a nanoparticle jet flow of MQL was established. The surface grinding thermal stress of three workpiece materials, namely, 45 Steel, 2Cr13, and nano-ZrO2 dental ceramic, were numerically simulated. Results show that dry grinding generates larger tensile stress, whereas MQL grinding generates larger compressive stress. The finished surface of workpiece produces large tensile stress in grinding direction. With the increase of cutting depth, the time-related variation of thermal stress on finished surface slows down gradually. Residual stress is inversely proportional to cutting depth. With the increase of cutting depth, the finished surface of workpiece is firstly dominated by large tensile stress, which decreases continuously until reaching the maximum compressive stress. Deeper layer is less influenced by temperature field, manifested by smaller stress value and slight variation of the whole stress field.

Nonlinear Transient Thermal Stress Analysis of Temperature-Dependent Hollow Cylinders Using a Finite Element Model

2014 ◽  
Vol 14 (07) ◽  
pp. 1450025 ◽  
Author(s):  
Ashraf M. Zenkour ◽  
Ibrahim A. Abbas
Keyword(s):  
Finite Element ◽  
Thermal Stress ◽  
Stress Analysis ◽  
Material Properties ◽  
Temperature Dependency ◽  
Temperature Dependent ◽  
Thermal Stress Analysis ◽  
Nonlinear Transient ◽  
Hollow Cylinders ◽  
Transient Thermal

In this paper, the nonlinear transient thermal stress analysis is conducted for temperature-dependent hollow cylinders subjected to a decaying-with-time thermal field. By the finite element method, the highly nonlinear governing equations are solved. The time histories of temperature, displacement, and stress due to the decaying-with-time thermal load are computed. A sensitivity analysis includes the effects of exponent of the decayed heat flux and temperature-dependency of density and material properties is carried out. Numerical results show some interesting characteristics of the thermoelastic behaviors of the hollow cylinders studied. In particular, the effect of temperature-dependency of the material properties on the thermoelastic parameters was demonstrated to be significant.

The Research of the Stress Test Technology on Bridge Type Grab Ship Unloader

2013 ◽  
Vol 631-632 ◽  
pp. 1017-1021
Author(s):  
Cheng Zhong He ◽  
Han Dong Liu
Keyword(s):  
Tensile Stress ◽  
Compressive Stress ◽  
Stress Test ◽  
Maximum Tensile Stress ◽  
Safety Performance ◽  
Normal Operation ◽  
Maximum Compressive Stress ◽  
Test Technology ◽  
Bridge Type ◽  
Maintenance And Inspection

The safety performance of bridge type grab ship unloaders are the main factors in the normal operation of a bulk cargo wharf. This article made a research of the stress test technology on the use of safety assessment on the structure of the bridge type grab ship unloader, through the dynamic stress test of ship unloader key parts of the structure under the use of the condition, analysis bridge type grab ship unloader safety performance is at ordinary times and maintenance and inspection needs to focus on the dangerous site.Stress test shows that the Maximum compressive stress is Point 7, its maximum dynamic compressive stress is 82.5MPa; while the maximum tensile stress occurs at point 11, its maximum dynamic tensile stress of 72.5MPa. After 17 years used, The force main parts (except former trolleys) of the ship unloader are basically the same as its design value.

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