Finite Element Analysis of Thermal Stress at the Interface in Plastic/Brittle Multi-Layer Composite Materials

1990 ◽  
Vol 112 (1) ◽  
pp. 138-142 ◽  
Author(s):  
Sui Lin ◽  
Xichen Yu ◽  
Wieliang Dai
Keyword(s):  
Finite Element ◽  
Thermal Stress ◽  
Brittle Material ◽  
High Stress ◽  
Stress Distributions ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Temperature Distributions ◽  
Layer Composite

The thermal stress of a multi-layer composite of plastic/brittle material was studied by the finite element method. High stress is found to be located on the interfaces between the plastic and the brittle material. 1-D and 2-D approaches for the determination of the temperature distributions in the multi-layer composite were examined. The 1-D approach gives an approximate 80 percent of error in temperature and a maximum of 20 percent of error in thermal stress in comparison with the 2-D approach. This suggests that, for a plastic/brittle composite, a 2-D approach for the determination of the temperature distribution should be taken in order to ensure the validity in the determination of both the temperature and stress distributions.

Finite element analysis of the phase transformation effect in residual stresses generated by quenching in notched steel cylinders

2005 ◽  
Vol 40 (2) ◽  
pp. 151-160 ◽  
Author(s):  
E P Silva ◽  
P M C L Pacheco ◽  
M. A Savi
Keyword(s):  
Finite Element ◽  
Phase Transformation ◽  
Residual Stresses ◽  
Induction Hardening ◽  
Martensite Phase ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Thermomechanical Behaviour ◽  
Quenching Process

The determination of residual stresses is an important task in the analysis of the quenching process. Nevertheless, because of the complexity of the phenomenon, many simplifications are usually adopted in the prediction of these stresses for engineering purposes. One of these simplifications is the effect of phase transformation. Many studies analyse residual stresses generated by the quenching process considering a thermoelastoplastic approach, neglecting phase transformation. The present study analyses the effect of austenite-martensite phase transformation during quenching in the determination of residual stresses, comparing two different models: complete (thermoelastoplastic model with austenite-martensite phase transformation) and without phase transformation (thermoelastoplastic model without phase transformation). The finite element method is employed for spatial discretization together with a constitutive model that represents the thermomechanical behaviour of the quenching process. Progressive induction hardening of steel cylinders with semicircular notches is of concern. Numerical simulations show situations where great discrepancies are introduced in the predicted residual stresses if phase transformation is neglected.

scholarly journals Determination of a synchronous generator characteristics via Finite Element Analysis

2005 ◽  
Vol 2 (2) ◽  
pp. 157-162 ◽  
Author(s):  
Zlatko Kolondzovski ◽  
Lidija Petkovska
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Software Package ◽  
Synchronous Generator ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Salient Pole ◽  
Element Method

In the paper a determination of characteristics of a small salient pole synchronous generator (SG) is presented. Machine characteristics are determined via Finite Element Analysis (FEA) and for that purpose is used the software package FEMM Version 3.3. After performing their calculation and analysis, one can conclude that most of the characteristics presented in this paper can be obtained only by using the Finite Element Method (FEM).

Thermal Stress Analysis and Sealing Performance Evaluation of Pipe Flange Connections With Spiral Wound Gaskets Under Elevated Temperature

2004 ◽  
Author(s):  
Toshiyuki Sawa ◽  
Wataru Maezaki
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Performance Evaluation ◽  
Thermal Stress ◽  
Elevated Temperature ◽  
Stress Distributions ◽  
The Finite Element Method ◽  
Sealing Performance ◽  
Effects Of Temperature ◽  
Spiral Wound

In this paper, the thermal stress distributions at the interfaces between pipe flanges and the gasket under elevated temperature and internal pressure were calculated by using the finite element method (FEM) taking into account hysteresis in the stress-strain curves of spiral wound gasket. Leakage tests were performed using helium gases. In addition, the effects of temperature on the sealing performance were examined by using an actual pipe flange connection with spiral wound gasket under elevated temperature. By using the calculated contact stress distributions and the results of the leakage tests, the sealing performance was evaluated.

Finite Element Analysis of a Quasi-Static Rolling Tire Model for Determination of Truck Tire Forces and Moments

1996 ◽  
Vol 24 (4) ◽  
pp. 278-293 ◽  
Author(s):  
A. A. Goldstein
Keyword(s):  
Finite Element ◽  
Ground Plane ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Finite Element Program ◽  
Truck Tire ◽  
Element Program ◽  
Longitudinal Slip ◽  
Tire Forces

Abstract The finite element method is used to simulate the slow (quasi-static) rolling of a radial truck tire subjected to ground plane tractions. Three conditions are considered, namely, (1) straight free rolling, (2) cornering, and (3) braking. Lateral and longitudinal slip are calculated by analyzing the motion of a moveable road surface relative to the wheel plane. Footprint moments are calculated for the cornering and braking condition. In addition, cornering stiffness, braking stiffness, and aligning stiffness are calculated and compared to measured results. Computational benchmark data is provided. The simulation was performed with the ABAQUS finite element program.

Thermal Stress Simulation of the Surface Grinding

2011 ◽  
Vol 383-390 ◽  
pp. 2211-2215
Author(s):  
Chong Lue Hua ◽  
Gui Cheng Wang ◽  
Hong Jie Pei ◽  
Gang Liu
Keyword(s):  
Finite Element ◽  
Thermal Stress ◽  
Thermal Stresses ◽  
Surface Grinding ◽  
Stress Distributions ◽  
The Finite Element Method ◽  
Temperature Dependent ◽  
Finite Element Procedure ◽  
Temperature Dependent Properties ◽  
Stress Simulation

Thermal stresses of grinding plays an important role on the fatigue and wear resistance of the component. A comprehensive analysis of thermal stress induced by surface grinding has been conducted with aid of the finite element method. To obtain a reliable figure of thermal stress induced by grinding, temperature-dependent properties of workpiece materials were taken into account. The developed finite element procedure has also been applied to calculate the surface and sub-surface thermal stress induced by moving source of triangular heat when convection and radiation is occurred over the whole work. Based on an analysis of the effects of wheel velocity on the thermal stress distributions in an elastic-plastic solid, some important conclusions were given.

Thermoelastic Solutions for a Finite Substrate With an Electronic Device

1991 ◽  
Vol 113 (1) ◽  
pp. 84-88 ◽  
Author(s):  
J. H. Lau
Keyword(s):  
Finite Element Analysis ◽  
Exact Solution ◽  
Finite Element ◽  
Steady State ◽  
Thick Plate ◽  
Electronic Device ◽  
Finite Thickness ◽  
Stress Distributions ◽  
Element Analysis ◽  
Temperature Distributions

Sneddon and Lockett obtained a fairly general solution to the steady-state thermoelastic problem for the thick plate (Sneddon and Lockett, 1960). In particular, they have obtained the exact solutions for axially symmetrical temperature distributions on the upper surface of the thick plate. In this note, their exact solution will be applied to an electronic problem, namely, a chip on a substrate with finite thickness. Emphasis is placed on the generation of dimensionless charts for the temperature, displacement, and stress distributions in the substrates. These charts are not only useful for designing substrates but also can be used to verify finite element analysis procedures.

Stresses in Nozzle Shell Junctions due to External Loads: A Comparative Study

2013 ◽  
Author(s):  
Dipak K. Chandiramani ◽  
Suresh K. Nawandar ◽  
Shyam Gopalakrishnan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Theoretical Background ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Section Viii ◽  
Division 2 ◽  
External Loads ◽  
Element Method

Various methods have been in use for the determination of stresses at the nozzle-shell junction due to external loads and moments. Some methods evaluate stress in the cylindrical or spherical shell (e.g. WRC 107 now WRC 537) while others evaluate stresses in cylindrical shells and nozzles (e.g. WRC 297). ASME Section VIII Division. 2 specifies use of WRC 107/WRC 297 or Finite Element Analysis (FEA) for determination of stresses at shell-nozzle junctions with external loads and moments on the nozzle. Each method could yield a different result for the same loading condition and geometry and this has been recognized in comparisons made in WRC 297 with WRC 107 and FEA. Further, customized FEA software are also available for this analysis. There still seems to be some confusion in users of these methods regarding selection of method for optimization of design. Users not familiar with Finite Element Method prefer to use calculations based on WRC 107/297. Hang-Sung Lee, et.al. have recently (PVP 2011 – 57407) analyzed nozzle shell junctions using the Finite Element Method, compared their results with calculations to WRC 297 and made recommendations. The work presented in this paper is not an attempt to compare individual stresses obtained by classical versus analytical methods. Instead, an attempt has been made to consolidate the results obtained by the various methods into charts to enable a user to make a preliminary assessment to ascertain under what geometrical conditions the calculations made by each of the above methods would result in overall Code acceptable stresses without the results being either overly conservative or un-conservative. This is particularly relevant to the geometries which use the graphs and charts which have been extrapolated without rigorous theoretical background in the WRC Bulletin 537. The Finite Element Method has been used as the referee method.

Shear Stress Distributions in a Bonded Joint under Tension

2013 ◽  
Vol 467 ◽  
pp. 327-331
Author(s):  
Xiao Cong He
Keyword(s):  
Finite Element ◽  
Shear Stress ◽  
High Stress ◽  
Three Dimensional ◽  
Adhesive Layer ◽  
Stress Distributions ◽  
Element Analysis ◽  
Left Hand ◽  
Bonded Joint ◽  
Hand Region

Shear stress distribution behaviour of a single-lap bonded joint under tension was investigated using the three-dimensional finite element methods. Five layers of 20-node solid elements were used across the adhesive layer thickness to get accurate indication of the variation of shear stress. The stress distributions in the joint are given by the stress contours. All the numerical results obtained from the finite element analysis show that the spatial distribution of shear stress are similar for all 6 interfaces though the stress values are obviously different. It can also be seen from the results that the left hand region is subjected to very high stress.

scholarly journals Mechanical and Thermal Stress Behavior of a Conservative Proposed Veneer Preparation Design for Restoring Misaligned Anterior Teeth: A 3D Finite Element Analysis

2020 ◽  
Vol 10 (17) ◽  
pp. 5814
Author(s):  
Shilan Nawzad Dawood ◽  
Abdulsalam Rasheed Al-Zahawi ◽  
Laith Abed Sabri
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Thermal Stress ◽  
Thermal Loading ◽  
Effect Of Temperature ◽  
Maxillary Incisor ◽  
Stress Distributions ◽  
Element Analysis ◽  
Anterior Teeth ◽  
Preparation Design

The objective of this study was to evaluate the biomechanical and thermal behavior of a proposed preparation design as a conservative treatment option that aims to preserve both gingival and tooth health structures through a comparative finite element analysis with non-preparation and conventional designs. 3D solid models of laminate veneers with different preparation designs were obtained using cone-beam computed tomography (CBCT) scanning of the maxillary incisor. A 100-Newton load was applied with angulations of 60° and 125° to the longitudinal axis of the tooth to determine the stresses during mastication. In addition, transient thermal analysis was performed to compare the temperature and thermal distribution of the restored tooth models when subjected to thermal loads of 5 °C and 55 °C. Teeth prepared with the proposed design showed lower stress distributions and a repairable failure mode, followed by the non-preparation design, while teeth prepared with the conventional design showed the highest stress concentrations. Furthermore, cold thermal loading yielded larger thermal stress distributions than hot thermal loading, independent of the preparation type, and the effect of temperature changes were within the critical limit near the pulp and dentin regions. Thus, the preparation design geometry affects the long-term success of laminate restoration, and the proposed design yields more uniform and appropriate stress distributions than the other techniques.

Using the Finite Element Method to Determine Temperature Distributions in Orthogonal Machining

1974 ◽  
Vol 188 (1) ◽  
pp. 627-638 ◽  
Author(s):  
A. O. Tay ◽  
M. G. Stevenson ◽  
G. De Vahl Davis
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Flow Stress ◽  
Strain Rate ◽  
Stress Distributions ◽  
The Finite Element Method ◽  
Orthogonal Machining ◽  
Temperature Distributions ◽  
Actual Shape ◽  
Element Method

Temperature distributions for typical cases of orthogonal machining with a continuous chip were obtained numerically by solving the steady two-dimensional energy equation using the finite element method. The distribution of heat sources in both the primary and secondary zones was calculated from the strain-rate and flow stress distributions. Strain, strain-rate and velocity distributions were calculated from deformed grid patterns obtained from quick-stop experiments. Flow stress was considered as a function of strain, strain-rate and temperature. The chip, workpiece and tool (actual shape and size) were treated as one system and material properties such as density, specific heat and thermal conductivity were considered as functions of temperature.

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