Finite Element Thermal Analysis for Microscale Laser Joining of Glass/Silicon System

2010 ◽  
Author(s):  
Ankitkumar Dhorajiya ◽  
Mohammed Mayeed ◽  
Golam Newaz
Keyword(s):  
Thermal Analysis ◽  
Finite Element ◽  
Laser Joining ◽  
Silicon System

Finite Element Thermal Analysis for Microscale Laser Joining of Nanoscale Coatings of Titanium on Glass/Polyimide System

2009 ◽  
Author(s):  
Mohammed S. Mayeed ◽  
Nusrat J. Lubna ◽  
Gregory W. Auner ◽  
Golam M. Newaz ◽  
Rahul Patwa ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Dissimilar Materials ◽  
Fe Model ◽  
Element Analysis ◽  
Laser Joining ◽  
Bonded Joint ◽  
Laser Heat Source

Finite element thermal analysis and comparison with experiments of microscale laser joining of biocompatible materials, polyimide (PI) and nanoscale coating of titanium (Ti) on glass (Gl), is vital for the long-term application of bio-implants and important for the applications of nanoscale solid coatings. In this study, a comprehensive three dimensional (3D) transient simulation for thermal analysis of transmission laser micro-joining of dissimilar materials has been performed by using the finite element (FE) code ABAQUS, along with a moving Gaussian laser heat source. The laser beam (wavelength of 1100 nm and diameter of 0.2 mm), moving at an optimized velocity (100 mm/min), passes through the transparent PI, gets absorbed by the absorbing Ti, and eventually melts the PI to form the bond. The laser bonded joint area is 6.5 mm long on three different Ti coating thicknesses of 400, 200 and 50 nms on Gl surface. Non-uniform mixed meshes have been used and optimized to formulate the 3D FE model and ensure very refined meshing around the bond area. During the microscale laser heating finite element modeling shows widths of PI surface experiencing temperatures above the glass transition temperature are similar to the widths of bonds observed in experiments for coating thicknesses of 400 and 200 nms of Ti on Gl. However, for the case of 50 nm coating bond width using finite element analysis cannot produce and is lower than the bond width observed experimentally.

Using Finite Element Discretisation for Spacecraft Thermal Analysis

1995 ◽  
Author(s):  
G. M. Cook ◽  
C. Hodgetts ◽  
N. J. Stock ◽  
P. Planas Almazan
Keyword(s):  
Thermal Analysis ◽  
Finite Element

Finite-element modelling of thermo-mechanical stress distribution in laser beam ceramic tile grout sealing process

2006 ◽  
Vol 220 (10) ◽  
pp. 1497-1508 ◽  
Author(s):  
A Liaqat ◽  
S Safdar ◽  
M A Sheikh
Keyword(s):  
Thermal Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Laser Beam ◽  
Mechanical Stress ◽  
Ceramic Tile ◽  
Element Model ◽  
Ceramic Tiles ◽  
Temperature Dependent ◽  
Heat Effects

Laser tile grout sealing is a special process in which voids between the adjoining ceramic tiles are sealed by a laser beam. This process has been developed by Lawrence and Li using a customized grout material and a high power diode laser (HPDL). The process has been optimally carried out at laser powers of 60–120 W and at scanning speeds of 3–15 mm/s. Modelling of the laser tile grout sealing process is a complex task as it involves a moving laser beam and five different materials: glazed enamel, grout material, ceramic tile, epoxy bedding, and ordinary Portland cement substrate. This article presents the finite element model (FEM) of the laser tile grout sealing process. The main aim of this model is to accurately predict the thermo-mechanical stress distribution induced by the HPDL beam in the process. For an accurate representation of the process, the laser was modelled as a moving heat source. A three-dimensional transient thermal analysis was carried out to determine the temperature distribution. Temperature-dependent material properties and latent heat effects, due to melting and solidification of the glazed enamel, were taken into account in the FEM, thereby allowing a more realistic and accurate thermal analysis. The results of the thermal analysis were used as an input for the stress analysis with temperature-dependent mechanical properties. The results obtained from the FEM are compared with the published experimental results.

Simulation of Nine-Spacer Nozzle’s Flow Field of Al Roll-Casting Using Coupled Fluid-Thermal Finite Element Analysis

2010 ◽  
Vol 159 ◽  
pp. 697-702
Author(s):  
Ying Zhou ◽  
Ya Xi Tan
Keyword(s):  
Thermal Analysis ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Flow Field ◽  
Three Dimensional ◽  
Fem Simulation ◽  
Cooling Capacity ◽  
Element Analysis ◽  
Roll Casting ◽  
Element Simulation

A three-dimensional coupled fluid-thermal finite element simulation model has been developed to provide analyzing distribution of velocity and temperature of nine-spacer nozzle by using FEM simulation of FLOTRAN module in ANSYS 6.0. To explore fluid-thermal analysis of the flow fields of nine-spacer nozzle of aluminum roll-casting, stricter analysis of postprocessing result was conducted by MATLAB. It was concluded that flow field of nine-spacer nozzle was able to match cooling capacity of cast rollers, but nine-spacer nozzle’s geometric flaw didn’t suit for working in the case of speed increasing of the drawing-sheet and thickness reducing of the aluminium sheet during roll casting.

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