Viscoelastic Characterization of Low-Dielectric Constant SiLK Films Using Nanoindentation in Combination With Finite Element Modeling

2004 ◽  
Vol 127 (3) ◽  
pp. 276-285 ◽  
Author(s):  
J. M. J. den Toonder ◽  
Y. Ramone ◽  
A. R. van Dijken ◽  
J. G. J. Beijer ◽  
G. Q. Zhang
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Dominant Role ◽  
Viscoelastic Model ◽  
Thermomechanical Properties ◽  
Indentation Load ◽  
Indentation Creep ◽  
Stress And Strain ◽  
Element Modeling ◽  
Silk Film

SiLK is a polymer material developed for use as a thin-film dielectric in the interconnect structure of high-density integrated circuits. Among others, its thermomechanical properties play a dominant role for the integrity and reliability of the interconnect during processing, testing, and use. Being a polymer, SiLK may show viscoelastic (time-dependent) behavior. In this paper, we use nanoindentation techniques in combination with analytical and finite element modeling (FEM) to determine the viscoelastic properties of a thin SiLK film on a silicon substrate. Indentation-creep experiments show that this SiLK film indeed responds in a viscoelastic way. This may be caused by the non fully cross-linked test samples prepared using nonstandard processing. Using the FEM simulation, we find that the behavior of this thin SiLK film can be described with a linear viscoelastic model up to the characteristic stress and strain levels of approximately 200MPa and 3%, respectively. For higher stress and strain levels, the response becomes nonlinear. The results are validated with independent indentation load-unload measurements.

The Optimization of the Structure of Bulk Chemical Hull Based on MSC.Patran/Nastran

2011 ◽  
Vol 105-107 ◽  
pp. 880-885
Author(s):  
Hao Wei Wu ◽  
Yong Jie Pang ◽  
Ye Li
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Transverse Section ◽  
Final Conclusion ◽  
Stress And Strain ◽  
Element Modeling ◽  
New Concepts ◽  
Bulk Chemical ◽  
New Type

The optimization of the structure of bulk chemical hull (BCH) is derived by the finite element modeling (FEM) which is obtained by Patran and Nastran. In this paper, first of all, a new type of ship, BCH, is introduced. Then, the optimal scenario in theory is indicated by researching the transverse section of cargo holds of an ordinary BCH. And the FEM of the cargo holds of this ship is analysed, including the modeling, the load and the figures of stress and strain. The final conclusion would be obtained by comparing of the results which could verify the assumption forenamed. The simplification of the design is contributed by the new concepts and powerful capabilities of modeling of Patran and Nastran which improved the efficiency of ship designers.

Dynamic Modeling and Durability Analysis from the Ground Up

2003 ◽  
Vol 46 (1) ◽  
pp. 128-134 ◽  
Author(s):  
Thomas Stadterman ◽  
William (Skip) Connon ◽  
Kyung Choi ◽  
Jeffrey Freeman ◽  
Alan Peltz
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Dynamic Modeling ◽  
Dynamic Stress ◽  
Stress And Strain ◽  
Integrated Process ◽  
Mechanical Reliability ◽  
Us Army ◽  
Element Modeling ◽  
Durability Analysis

Vehicle manufacturers currently use dynamic modeling, finite element modeling, and durability analysis to incorporate reliability into their designs. Although these models are often used separately, there has been little effort toward integrating these analyses and performing an analysis from the "ground up" (i.e., using terrain data to determine dynamic stress and strain). This paper outlines the approach of an ongoing analysis of a US Army trailer, using an integrated process of dynamic modeling, finite element modeling, and durability analysis. This project outlines an approach to mechanical reliability analysis that can be used early in design.

Reconditioning by Metal Deposition Technology - Temperature Finite Element Modeling

2014 ◽  
Vol 1029 ◽  
pp. 130-133 ◽  
Author(s):  
Dan Florin Nitoi ◽  
Gabriel Marius Dumitru ◽  
Bogdan Dumitru ◽  
Alexandru Mihailescu ◽  
Suzana Carmen Cismas
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Working Condition ◽  
Metal Deposition ◽  
Strain Gauges ◽  
Stress And Strain ◽  
Initial Condition ◽  
Output Data ◽  
Element Modeling ◽  
Deposition Technology

Paper presents the finite element modeling for the stress and temperature as a result of the metal deposition technology. In this case, this research method is the only one that offers information because of the working condition that are total unfavourable for stress and strain gauges. By selecting the most appropriate initial condition, the output data are very close to real result. In the paper, the temperature behavior is model because its influence in structural transformation and the stress because it can cause problems in the situation of an incorrect working technology.

Characterization of Elastoplastic Properties Based on Inverse Analysis and Finite Element Modeling of Two Separate Indenters

2006 ◽  
Vol 129 (4) ◽  
pp. 603-608 ◽  
Author(s):  
Chaiwut Gamonpilas ◽  
Esteban P. Busso
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Inverse Analysis ◽  
Indentation Load ◽  
Unknown Parameters ◽  
Element Modeling ◽  
Rate Dependent ◽  
Dependent Behavior ◽  
Elastoplastic Properties ◽  
Strain Hardening Behavior

A method that can determine uniquely the elastoplastic properties from indentation loading and unloading curves has been developed. It is based on finite element modeling and inverse analysis of two separate indenters. The approach was validated by numerical experiments using a fictitious material. It was demonstrated that the proposed method can uniquely recover the elastoplastic properties using only indentation load-displacement curves of two indenters. Although the proposed procedure has been used to predict elastoplastic strain hardening behavior, it is also applicable to estimate other mechanical properties where there are more than two unknown parameters, such as rate-dependent behavior.

Exact First Order Finite Element Modeling for Eddy Current NDE

1991 ◽  
Vol 3 (1) ◽  
pp. 235-253 ◽  
Author(s):  
L. D. Philipp ◽  
Q. H. Nguyen ◽  
D. D. Derkacht ◽  
D. J. Lynch ◽  
A. Mahmood
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Eddy Current ◽  
Element Modeling ◽  
First Order ◽  
Eddy Current Nde
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