scholarly journals Thermomechanical Analysis of Ceramic Composites Using Object Oriented Finite Element Analysis

2021 ◽  
Author(s):  
Satyanarayan Patel
Keyword(s):  
Finite Element ◽  
Thermal Expansion ◽  
Coefficient Of Thermal Expansion ◽  
Object Oriented ◽  
Thermomechanical Analysis ◽  
Ceramic Composites ◽  
Thermomechanical Properties ◽  
Element Analysis ◽  
Simulation Techniques ◽  
Barrier Coating

This chapter discussed the object oriented finite element (OOF2)-based studies for ceramic composites. OOF2 is an effective method that uses an actual microstructure image of the material/composites for simulation. The effect of filler inclusions on the thermomechanical properties (coefficient of thermal expansion, thermal conductivity, Young’s modulus, stress and strain) is discussed. For this purpose, various ceramics composites (thermal barrier coating and ferroelectric based) are considered at homogeneous and heterogeneous temperature/stress conditions. The maximum stress is found at the interface of the filler/matrix due to their mismatch of thermal expansion coefficient. Further, residual and localized interface stress distributions are evaluated to analyze the composite’s failure behavior. The possible integration of OOF2 with other simulation techniques is also explored.

scholarly journals Thermal analysis of metal-ceramic bonding using finite element method

2014 ◽  
Vol 3 (2) ◽  
pp. 216 ◽  
Author(s):  
S. Gopinath ◽  
R Sabarish ◽  
R. Sasidharan
Keyword(s):  
Finite Element ◽  
Thermal Expansion ◽  
Thermal Stress ◽  
Bonding Strength ◽  
Coefficient Of Thermal Expansion ◽  
Linear Thermal Expansion ◽  
Processing Temperature ◽  
Element Analysis ◽  
Metal Ceramic ◽  
The Difference

This paper reports a finite element study of effect of bonding strength between metal and ceramic. The bonding strength is evaluated with different processing temperature and holding time. The difference between the coefficients of linear thermal expansion (CTEs) of the metal and ceramic induces thermal stress at the interface. The mismatch thermal stress at the interface region plays an important role in improving bonding strength. Hence, it is essential to evaluate the interface bonding in metal-ceramics joints. The Al/SiC bonding was modeled and analyzed using finite element analysis in ANSYS (v.10). Keywords: Bonding Strength, Coefficient of Thermal Expansion, Thermal Stress, Interface, Al/Sic, FEA.

Finite Element Analysis of the Thermal Characteristics and Parametric Study of Steady Rolling Tires

2012 ◽  
Vol 40 (3) ◽  
pp. 201-218 ◽  
Author(s):  
Youshan Wang ◽  
Yintao Wei ◽  
Xijin Feng ◽  
Zhenhan Yao
Keyword(s):  
Finite Element ◽  
Parametric Study ◽  
Thermal Characteristics ◽  
Internal Heat ◽  
Thermomechanical Analysis ◽  
Thermomechanical Properties ◽  
Temperature Fields ◽  
Dimensional Structure ◽  
Element Analysis ◽  
Finite Element Program

ABSTRACT This article presents a numerical thermomechanical analysis and parametric study of steady rolling tires that are treated as axisymmetric structures for simplification. Under periodic stress–strain cycles, during tire rolling, internal heat will be generated because of energy loss from the tire material. A general-purpose, finite element program is used to model this two-dimensional heat conduction with distributed, internal heat sources, whereas an in-house code for tire simulation performs the underlying three-dimensional structure and heat-generation rate analysis. The tire belts and carcasses are modeled using layer solid elements with transverse, isotropic, thermomechanical properties, whereas the rubber components are made of isotropic materials. The goal of this article is to develop a simple and easy methodology for simulating tire thermomechanical behavior. Furthermore, the parametric study for the highest shoulder temperature (HST), which is widely accepted as one of the triggers of tire failure, has been performed. The HST sensitivities to the selected parameters have been computed from the simulated temperature fields under different conditions, which provide a guidance to improve the tire structural, material, and pattern designs.

Microstructural Finite Element Modeling and Simulation on Al–MgO Composites

2015 ◽  
Vol 12 (05) ◽  
pp. 1550030 ◽  
Author(s):  
Satyanarayan Patel ◽  
Rahul Vaish ◽  
Vishal Singh Chauhan ◽  
Chris Bowen
Keyword(s):  
Finite Element ◽  
Volume Fraction ◽  
Filler Content ◽  
Coefficient Of Thermal Expansion ◽  
Object Oriented ◽  
Stress And Strain ◽  
Thermal And Mechanical Properties ◽  
Element Analysis ◽  
Local Stresses ◽  
Properties Of Composites

Object Oriented Finite Element Analysis (OOF2) is used to predict the thermal and mechanical properties of Al – MgO composites. In this work, three compositions of composites containing 5%, 10% and 15% MgO (by volume) are studied. The influence of MgO volume fraction is examined in terms of effective Young's modulus and coefficient of thermal expansion of the composites. In addition, the stress and strain contours are plotted, which are helpful to understand the mechanical behavior of these composites. It is noted that the properties of composites are improved because of the presence of MgO . However, local stresses increase with filler content.

Finite-Element Modeling and Analysis of Early-Age Cracking Risk of Cast-In-Place Concrete Culverts

2018 ◽  
Vol 2672 (27) ◽  
pp. 24-36 ◽  
Author(s):  
Yalin Liu ◽  
Anton K. Schindler ◽  
James S. Davidson
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Thermal Expansion ◽  
Lightweight Concrete ◽  
Coefficient Of Thermal Expansion ◽  
Early Age ◽  
Thermal Coefficient ◽  
Element Analysis ◽  
Joint Spacing ◽  
Cracking Risk

Extensive cracking was found in several cast-in-place concrete culverts in Alabama. This condition can decrease the long-term durability of the culverts. Early-age stress development in concrete is influenced by temperature changes, modulus of elasticity, stress relaxation, shrinkage, thermal coefficient of expansion, and the degree of restraint. The objective of this study is to determine means to mitigate early-age cracking in culverts by evaluating the cracking risk. Finite-element analysis was used to model the early-age stress by accounting for the following factors: construction sequencing, support restraint, concrete constituents, temperature effects, and the time-dependent development of mechanical properties, creep/relaxation, and drying shrinkage. Experimental results from restraint to volume change tests with rigid cracking frames were used to verify the accuracy of the finite-element analysis. A parametric study was performed to quantify the effect of changing joint spacing, joint type, construction sequence, concrete coefficient of thermal expansion, placement season, and concrete type on the risk of early-age cracking. The finite-element model results revealed that the use of the following measures will reduce the risk of early-age cracking in cast-in-place concrete culverts: concrete with lower coefficient of thermal expansion, contraction joints, sand-lightweight concrete or all-lightweight concrete, and scheduling the casting of the culvert wall to minimize the difference in its placement time relative to its previously cast base. Alternatively, to minimize the contribution of thermal effects on risk of cracking, the construction schedule should be developed to avoid concrete placement during hot weather conditions.

Finite element analysis of WC–Al2O3 composites

2014 ◽  
Vol 03 (01) ◽  
pp. 1450002
Author(s):  
Satyanarayan Patel ◽  
Rahul Vaish
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Thermal Expansion ◽  
Analytical Methods ◽  
Object Oriented ◽  
Stress And Strain ◽  
Thermal And Mechanical Properties ◽  
Element Analysis

Object oriented finite element analysis (OOF2) is used to estimate the thermal and mechanical properties of WC– Al 2 O 3 composites. In the present work, five compositions of 10%, 20%, 30%, 40% and 50% Al 2 O 3 (by volume) are studied. Young's modulus, thermal conductivity and thermal expansion coefficient are estimated using OOF2 and compared with other known analytical methods. Stress and strain contours are plotted to study the thermal and mechanical behavior of composites. It is found that the stresses are largely concentrated at the interfaces of the WC– Al 2 O 3 phases.

Effect of Refractory᾽s Thermal Expansion Coefficient on the Stress Field of the Top of Gasifier

2011 ◽  
Vol 418-420 ◽  
pp. 997-1001
Author(s):  
Wen Dong Xue ◽  
Xiao Xiao Huang ◽  
Jing Xie ◽  
Gang Liu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Thermal Expansion ◽  
Temperature Field ◽  
Stress Field ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Coefficient Of Thermal Expansion ◽  
Element Analysis ◽  
Analysis Technique

The top of COREX-C3000 gasifier was simulated with a finite element analysis technique. It is studied of the influence of thermal expansion coefficient of the refractories on the temperature field and stress field and the function discipline with different parameters. The results of the simulation indicated that when the coefficient of thermal expansion of working lining and permanent lining are respectively 3.5×10-6/K and 4.5×10-6/K, the distortion and initial stress of the gasifier top are much less.

Extraction of the Coefficient of Thermal Expansion of Thin Films from Buckled Membranes

1998 ◽  
Vol 546 ◽  
Author(s):  
V. Ziebartl ◽  
O. Paul ◽  
H. Baltes
Keyword(s):  
Thin Films ◽  
Finite Element ◽  
Thermal Expansion ◽  
Silicon Nitride ◽  
Excellent Agreement ◽  
Energy Minimization ◽  
Coefficient Of Thermal Expansion ◽  
Temperature Dependent ◽  
Minimization Method ◽  
Energy Minimization Method

AbstractWe report a new method to measure the temperature-dependent coefficient of thermal expansion α(T) of thin films. The method exploits the temperature dependent buckling of clamped square plates. This buckling was investigated numerically using an energy minimization method and finite element simulations. Both approaches show excellent agreement even far away from simple critical buckling. The numerical results were used to extract Cα(T) = α0+α1(T−T0 ) of PECVD silicon nitride between 20° and 140°C with α0 = (1.803±0.006)×10−6°C−1, α1 = (7.5±0.5)×10−9 °C−2, and T0 = 25°C.

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