Incompressibility and mesh sensitivity analysis in finite element simulation of rubbers

2016 ◽  
Vol 7 (1) ◽  
pp. 7-12 ◽  
Author(s):  
D. Huri
Keyword(s):  
Finite Element ◽  
Material Characterization ◽  
Numerical Stability ◽  
Material Parameters ◽  
Linear Finite Element ◽  
Element Simulation ◽  
Finite Element Calculations ◽  
Mesh Density ◽  
Rubber Component

Non-linear finite element calculations are indispensable when important information of the material response under load of a rubber component is desired. Although the material characterization of a rubber component is a demanding engineering task, the changing contact range between the parts and the incompressibility behaviour of the rubber further increase the complexity of the investigations. In this paper the effects of the choice of the numerical material parameters (e.g. bulk modulus) are examined with regard to numerical stability, mesh density and calculation accuracy. As an example, a rubber spring is chosen where contact problem is also handled.

scholarly journals Correlation of Global Quantities at Material Characterization of Pressure-Sensitive Materials Using Sharp Indentation Testing

Lubricants ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 29
Author(s):  
Carl F. O. Dahlberg ◽  
Jonas Faleskog ◽  
Per-Lennart Larsson
Keyword(s):  
Finite Element ◽  
Material Characterization ◽  
Pressure Sensitivity ◽  
Pressure Sensitive ◽  
The Mean ◽  
Sharp Indentation ◽  
Von Mises ◽  
Von Mises Plasticity ◽  
Hardness Values

Correlation of sharp indentation problems is examined theoretically and numerically. The analysis focuses on elastic-plastic pressure-sensitive materials and especially the case when the local plastic zone is so large that elastic effects on the mean contact pressure will be small or negligible as is the case for engineering metals and alloys. The results from the theoretical analysis indicate that the effect from pressure-sensitivity and plastic strain-hardening are separable at correlation of hardness values. This is confirmed using finite element methods and closed-form formulas are presented representing a pressure-sensitive counterpart to the Tabor formula at von Mises plasticity. The situation for the relative contact area is more complicated as also discussed.

scholarly journals Prediction of a Two-Transistor Vertical QNOT Gate

2020 ◽  
Vol 10 (21) ◽  
pp. 7597
Author(s):  
Heesung Han ◽  
Chang-Hyun Kim
Keyword(s):  
Finite Element ◽  
Complementary Metal Oxide Semiconductor ◽  
Logic Circuits ◽  
Metal Oxide Semiconductor ◽  
Oxide Semiconductor ◽  
Cmos Inverter ◽  
Material Parameters ◽  
Element Simulation ◽  
Charge Injection Barrier ◽  
Injection Barrier

A new design of quaternary inverter (QNOT gate) is proposed by means of finite-element simulation. Traditionally, increasing the number of data levels in digital logic circuits was achieved by increasing the number of transistors. Our QNOT gate consists of only two transistors, resembling the binary complementary metal-oxide-semiconductor (CMOS) inverter, yet the two additional levels are generated by controlling the charge-injection barrier and electrode overlap. Furthermore, these two transistors are stacked vertically, meaning that the entire footprint only consumes the area of one single transistor. We explore several key geometrical and material parameters in a series of simulations to show how to systematically modulate and optimize the quaternary logic behaviors.

Mechanical, Electrical and Thermal Characterization of Commercially Available LTCC Dielectric Tapes

2013 ◽  
Vol 543 ◽  
pp. 212-215
Author(s):  
Goran Radosavljević ◽  
Nelu Blaž ◽  
Andrea Marić ◽  
W. Smetana ◽  
Ljiljana Živanov
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Electrical Properties ◽  
Material Characterization ◽  
Mechanical Characterization ◽  
Thermal Characterization ◽  
Material Parameters ◽  
Mechanical And Electrical Properties

Presented paper deals with mechanical and electrical properties of several commercially available LTCC (Low Temperature Co-fired Technology) tapes, as well as their thermal characterization. Three commercially available dielectric tape materials provided by Heraeus (CT700, CT707 and CT800) are investigated. The samples for determination of significant material parameters are prepared using the standard LTCC fabrication process. Results of the material characterization (chemical analysis, surface roughness electrical and mechanical properties) are presented. In addition thermo-electrical and-mechanical characterization of investigated tapes analysis is performed.

Investigation of Mesh Dependency of Materials Fracture in the Finite Element Simulation of a Projectile Penetrating into a Target

2015 ◽  
Vol 782 ◽  
pp. 302-308
Author(s):  
Jin Tao Liu ◽  
Qun Bo Fan ◽  
Hong Nian Cai ◽  
Guo Ju Li
Keyword(s):  
Finite Element ◽  
Characteristic Length ◽  
Element Calculation ◽  
Mesh Dependency ◽  
Damage And Fracture ◽  
Element Simulation ◽  
Variable Characteristic ◽  
Mesh Density ◽  
Finite Element Numerical Simulation ◽  
Nonlocal Approach

In finite element numerical simulation, the calculating results of geometrical models with different mesh density tend to have obvious differences, especially when material damage and fracture are considered. In order to study the mesh dependency of the finite element calculation, models of a projectile penetrating into the target with different mesh densities are constructed by using LS-DYNA. A nonlocal approach is investigated and the results without and with MAT_NONLOCAL are compared. It is found that the nonlocal model with a variable characteristic length parameter provides a relatively accurate and stable result, and the calculation cost can be reduced.

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