THERMOMECHANICAL MODELING OF ELECTRONIC PACKAGES

2011 ◽  
Vol 02 (01) ◽  
pp. 45-66 ◽  
Author(s):  
N. JAGANNATHAN ◽  
R. PALANINATHAN
Keyword(s):  
Heat Dissipation ◽  
Thermal Stresses ◽  
Three Dimensional ◽  
Stress Fields ◽  
Electronic Packages ◽  
Gauss Point ◽  
Modeling And Analysis ◽  
Three Dimensional Modeling ◽  
Solder Balls ◽  
Thermomechanical Modeling

This paper is concerned with an integrated thermomechanical modeling and analysis of electronic packages. As the technology advances in terms of speed and density of circuit within a chip, the power dissipation increases exponentially. The packages are subjected to heating during fabrication, testing, and service. Due to the heterogeneous construction with wide mismatch of material properties, thermal stresses are induced which would result in mechanical failures such as cracking and delamination. It is essential to analyze the packages for thermal and stress fields and check their compliance with the design requirements. Earlier investigations were mostly based on approximate models such as plane-stress, plane-strain, and axisymmetric conditions. In reality, none of the packages satisfies the conditions associated with these models. In this work, 3D solid finite element with variable nodes, 8–21 nodes per element is employed. Software has been developed with the following features: sequentially coupled thermomechanical modeling, nonlinear transient solution capability, incompatible mode option when 8-node brick element is used, better estimation of nodal stresses by transformation from gauss point stresses, and quadratic criterion for delamination failure. A flipchip has been analyzed using the software developed for their thermal and stress fields. Numerical results indicate: the junction temperatures exceed the specification limits for higher heat dissipation, if appropriate cooling is not applied. The stresses in the die corner and at the solder balls are critical. Three-dimensional modeling is necessary for estimation of the same. Appropriate failure criterion was used in the failure prediction.

Three Dimensional Virtual Modeling and Analysis Methods of Embedded Drivetrains

2009 ◽  
Author(s):  
Steven Mulski ◽  
Lutz Mauer
Keyword(s):  
System Analysis ◽  
Three Dimensional ◽  
Fast Fourier Transformation ◽  
Modeling And Analysis ◽  
Transfer Path ◽  
Three Dimensional Modeling ◽  
Analysis Methods ◽  
Virtual Models ◽  
Durability Analysis ◽  
Virtual Modeling

Drivetrains are a major source of vibration, noise and system failures. Accordingly, a significant amount of time and effort is being invested developing simulation methods in order to better understand and avoid potentially damaging vibrations, even before prototypes are created for testing. The first step in simulating any drivetrain is creating suitable virtual models to investigate particular phenomena. Too much model detail leads to long computation times and difficulties in interpreting results, while too little may fail to include desired effects. Because the various levels of detail available in multi-body simulation (MBS) are practically limitless, a significant amount of attention must be given in order to choose the appropriate modeling elements. In the simplest form an entire drivetrain can be modeled as several rigid masses connected with torsional springs, which is justifiable for fundamental concept analyses. For other analyses, full three dimensional modeling with complex components may be necessary. Higher frequency analyses may even necessitate the inclusion of material bending for achieving accurate results. The various available elements for modeling specific components must be well understood in order that appropriate choices are made. Modeling requirements for the elements commonly used in the simulation of drivetrains will be discussed. For example: bearings, gearwheels, universal and constant velocity joints, frequency and amplitude dependent mounts, flexible components (e.g. shafts and gearbox housings), etc. Once virtual models are available, various analysis methods are applied in order to aid designers in identifying and quantifying potentially damaging vibrations. Again the application and limitation of these methods must be well understood in order to generate meaningful results. The following methods will be compared and discussed: resonance analysis, linear system analysis, run-up Fast Fourier Transformation analysis, order analysis, transfer path analysis and durability analysis. These drivetrain modeling techniques and analysis methods are not limited to any specific field of engineering, but can be applied to an extensive range of engineering disciplines. Analyses applied to virtual models out of the automotive and wind turbine sectors will be shown.

Research on Modeling and Visualization Method of Geological Objects Based on VRML

2013 ◽  
Vol 448-453 ◽  
pp. 3766-3771
Author(s):  
Chang Yang ◽  
Hao Li ◽  
Peng Gao ◽  
Yu Feng Mao ◽  
Rong Chun Zhang
Keyword(s):  
Three Dimensional ◽  
Visualization Method ◽  
Analysis Software ◽  
Cross Sectional ◽  
Modeling And Analysis ◽  
Modeling Methods ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Modelling Method ◽  
Real Time Visualization

Geological strata conditions is restriction to the design and construction of projects .The significance of three-dimensional modeling of engineering rock mass is obviously for both construction and monitoring.However,the existing three-dimensional modeling methods have the disadvantages of low productivity and huge amounts of data . Focusing on these problems, a fast modelling method used to build geological model is presented in this paper. Compared with the special geological 3D modeling and analysis software ,VRML has many merits such as flexible visualization method, good transplantation of the visualization achievements , and independent platform . VRML also has the feasibility of low-bandwidth and the real-time visualization and browsing of the models .It is well suited to the visualization requirement of drilling data and cross-sectional data ,and provides a new solution for the realization of the geological visualization.

Effects of Local Interfacial Debonding on the Stress Evolution in Aluminum Interconnects

1997 ◽  
Vol 473 ◽  
Author(s):  
Y. -L. Shen
Keyword(s):  
Thermal Stresses ◽  
Three Dimensional ◽  
Interfacial Debonding ◽  
Stress Fields ◽  
Stress Evolution ◽  
Geometrical Features ◽  
Dimensional Finite Element ◽  
Interconnect Reliability ◽  
Three Dimensional Finite Element ◽  
Aluminum Interconnects

ABSTRACTThe evolution of thermal stresses in aluminum interconnects, with the presence of local debonded areas between the aluminum line and the surrounding dielectric, is studied numerically. Local interfacial debonding is presumably due to contamination during the line patterning process. Various geometrical features of the interconnect and the debond segment are assumed, and the resulting stress fields are examined by recourse to two- and three-dimensional finite element analyses. Implications of the findings to the interconnect reliability, particularly stress-induced voiding in aluminum lines, are discussed.

scholarly journals Modeling metal removal from workpiece surface during centrifugal rotation processing

2021 ◽  
Vol 2131 (5) ◽  
pp. 052030
Author(s):  
N Van Tho ◽  
A Soloviev ◽  
M Tamarkin
Keyword(s):  
Contact Interaction ◽  
Metal Removal ◽  
Abrasive Particle ◽  
Three Dimensional ◽  
Technological Parameters ◽  
Machining Time ◽  
Workpiece Surface ◽  
Modeling And Analysis ◽  
Three Dimensional Modeling ◽  
Removal Of Metal

Abstract The modeling and analysis the removal of metal process in centrifugal rotational processing of workpiece in abrasive medium are considered in this article. The single contact interaction process between abrasive particle and the workpiece surface is researched through three-dimensional modeling taking into account dry coefficient of friction. The contact interaction problem is solved through Ansys software and Archard code programmed to analyze the data. The removal of metal from the workpiece surface is researched when changing the technological parameters: friction coefficient, machining time, speed. The dependences between metal removal from the workpiece surface and technological parameters are constructed, from which reasonable parameters can be selected when machining the workpiece, allowing to achieve high accuracy. Experimental results have been confirmed by simulation results. Through this research, essential and important data sheets will be provided for actual production and testing activities. Consequently, time and money are saved in achieving the desired surface quality.

scholarly journals Three-dimensional modeling and analysis of a high energy density Kelvin-Helmholtz experiment

2012 ◽  
Vol 19 (9) ◽  
pp. 092112 ◽  
Author(s):  
K. S. Raman ◽  
O. A. Hurricane ◽  
H.-S. Park ◽  
B. A. Remington ◽  
H. Robey ◽  
...  
Keyword(s):  
Energy Density ◽  
Three Dimensional ◽  
High Energy ◽  
High Energy Density ◽  
Modeling And Analysis ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling
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