Coupling atomistic and continuum length scales in heteroepitaxial systems: Multiscale molecular-dynamics/finite-element simulations of strain relaxation inSi∕Si3N4nanopixels

2005 ◽  
Vol 72 (11) ◽  
Author(s):  
Elefterios Lidorikis ◽  
Martina E. Bachlechner ◽  
Rajiv K. Kalia ◽  
Aiichiro Nakano ◽  
Priya Vashishta
Keyword(s):  
Molecular Dynamics ◽  
Finite Element ◽  
Strain Relaxation ◽  
Finite Element Simulations ◽  
Length Scales

A Compliant Transmission Mechanism With Intermittent Contacts for Cycle-Doubling

2006 ◽  
Vol 129 (1) ◽  
pp. 114-121 ◽  
Author(s):  
Nilesh D. Mankame ◽  
G. K. Ananthasuresh
Keyword(s):  
Finite Element ◽  
Conceptual Design ◽  
Finite Element Simulations ◽  
Nonlinear Finite Element ◽  
Transmission Mechanism ◽  
Input Frequency ◽  
Length Scales ◽  
Wide Range ◽  
Macro Scale ◽  
Functional Prototype

A novel compliant transmission mechanism that doubles the frequency of a cyclic input is presented in this paper. The compliant cycle-doubler is a contact-aided compliant mechanism that uses intermittent contact between itself and a rigid surface. The conceptual design for the cycle-doubler was obtained using topology optimization in our earlier work. In this paper, a detailed design procedure is presented for developing the topology solution into a functional prototype. The conceptual design obtained from the topology solution did not account for the effects of large displacements, friction, and manufacturing-induced features such as fillet radii. Detailed nonlinear finite element analyses and experimental results from quasi-static tests on a macro-scale prototype are used in this paper to understand the influence of the above factors and to guide the design of the functional prototype. Although the conceptual design is based on the assumption of quasi-static operation, the modified design is shown to work well in a dynamic setting for low operating frequencies via finite element simulations. The cycle-doubler design is a monolithic elastic body that can be manufactured from a variety of materials and over a range of length scales. This makes the design scalable and thus adaptable to a wide range of operating frequencies. Explicit dynamic nonlinear finite element simulations are used to verify the functionality of the design at two different length scales: macro (device footprint of a square of 170mm side) at an input frequency of 7.8Hz; and meso (device footprint of a square of 3.78mm side) at an input frequency of 1kHz.

Uniaxial deformation of polystyrene–silica nanocomposites studied by hybrid molecular dynamics–finite element simulations

2017 ◽  
Vol 129 ◽  
pp. 1-12 ◽  
Author(s):  
Shengyuan Liu ◽  
Sebastian Pfaller ◽  
Mohammad Rahimi ◽  
Gunnar Possart ◽  
Paul Steinmann ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Finite Element ◽  
Finite Element Simulations ◽  
Uniaxial Deformation ◽  
Silica Nanocomposites

Coupling of Length Scales: Hybrid Molecular Dynamics and Finite Element Approach for Multiscale Nanodevice Simulations

2000 ◽  
Vol 653 ◽  
Author(s):  
Elefterios Lidorikis ◽  
Martina E. Bachlechner ◽  
Rajiv K. Kalia ◽  
George Z. Voyiadjis ◽  
Aiichiro Nakano ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Finite Element ◽  
Length Scales ◽  
Finite Element Approach ◽  
Element Approach

Nanoindentation of model diamond nanocomposites: Hierarchical molecular dynamics and finite-element simulations

2009 ◽  
Vol 47 (1) ◽  
pp. 1-11 ◽  
Author(s):  
James D. Pearson ◽  
Guangtu Gao ◽  
Mohammed A. Zikry ◽  
Judith A. Harrison
Keyword(s):  
Molecular Dynamics ◽  
Finite Element ◽  
Finite Element Simulations

DYNAMICALLY SPANNING THE LENGTH SCALES FROM THE QUANTUM TO THE CONTINUUM

2000 ◽  
Vol 11 (06) ◽  
pp. 1135-1148 ◽  
Author(s):  
FARID F. ABRAHAM
Keyword(s):  
Finite Element Method ◽  
Molecular Dynamics ◽  
Finite Element ◽  
Tight Binding ◽  
Physical Problem ◽  
The Finite Element Method ◽  
Length Scales ◽  
Computational Sciences ◽  
Dynamic Treatment ◽  
The Continuum

A challenging paradigm in computational sciences is the coupling of the continuum, the atomistic, and the quantum descriptions of matter for a unified dynamic treatment of a single physical problem. We described the recent achievement of such a goal. We have spanned the length scales in a concerted simulation comprising the finite-element method, classical molecular dynamics, quantum tight-binding dynamics and seamless bridges between these different physical descriptions. We illustrate and validate the methodology for rapid crack propagation in silicon.

A Contact-Aided Compliant Mechanical Cycle-Doubler: Preliminary Analysis and Testing

2004 ◽  
Author(s):  
Nilesh D. Mankame ◽  
G. K. Ananthasuresh
Keyword(s):  
Finite Element ◽  
Compliant Mechanism ◽  
Frequency Doubling ◽  
Finite Element Simulations ◽  
Nonlinear Finite Element ◽  
Input Frequency ◽  
Length Scales ◽  
Low Frequencies ◽  
Macro Scale ◽  
Explicit Dynamic

The performance of a contact-aided compliant mechanism that functions as a cycle doubler is studied in this paper via nonlinear finite element simulations. The topology of this mechanism was obtained from a systematic synthesis procedure and is reported elsewhere. Although the design was obtained for a quasi-static specification, the kinematic characteristics of the design suggest its ability to function adequately at low to moderate frequencies. The scalability of the design and its single-piece construction enable fabrication using different materials at various length scales. Therefore, it is possible to choose a scale and material combination that yields the frequency doubling action for various input frequencies. Explicit dynamic nonlinear finite element simulations are used to verify the functionality of the design at two different length scales: macro (device footprint of 289 sq. cm) corresponding to an input frequency of 20 Hz and meso (device footprint of a square of 14.3 sq. cm) corresponding to an input frequency of 1 kHz. Experiments on a macro scale prototype are used to validate the FE simulations for low frequencies.

Sign in / Sign up

Export Citation Format

Share Document