Study of Nanoindentation Using FEM Atomic Model

2004 ◽  
Author(s):  
Yeau-Ren Jeng ◽  
Chung-Ming Tan
Keyword(s):  
Thin Film ◽  
Finite Element ◽  
Computation Time ◽  
Nonlinear Finite Element ◽  
Atomic Scale ◽  
Scale Model ◽  
Stress And Strain ◽  
Element Formulation ◽  
Element Simulation ◽  
Maximum Indentation Depth

This paper adopts an atomic-scale model based on the nonlinear finite element formulation to analyze the stress and strain induced in a very thin film during the nanoindentation process. The deformation evolution during the nanoindentation process is evaluated using the quasi-static method, thereby greatly reducing the required computation time. The finite element simulation results indicate that the microscopic plastic deformation in the thin film is caused by instability of its crystalline structure, and that the magnitude of the nanohardness varies with the maximum indentation depth and the geometry of the indenter.

Study of Nanoindentation Using FEM Atomic Model

2004 ◽  
Vol 126 (4) ◽  
pp. 767-774 ◽  
Author(s):  
Yeau-Ren Jeng ◽  
Chung-Ming Tan
Keyword(s):  
Thin Film ◽  
Finite Element ◽  
Computation Time ◽  
Nonlinear Finite Element ◽  
Atomic Scale ◽  
Scale Model ◽  
Stress And Strain ◽  
Element Formulation ◽  
Element Simulation ◽  
Maximum Indentation Depth

This paper adopts an atomic-scale model based on the nonlinear finite element formulation to analyze the stress and strain induced in a very thin film during the nanoindentation process. The deformation evolution during the nanoindentation process is evaluated using the quasi-static method, thereby greatly reducing the required computation time. The finite element simulation results indicate that the microscopic plastic deformation in the thin film is caused by instability of its crystalline structure, and that the magnitude of the nanohardness varies with the maximum indentation depth and the geometry of the indenter.

Finite Element Simulation of a Strong-Post W-Beam Guardrail System

SIMULATION ◽  
2002 ◽  
Vol 78 (10) ◽  
pp. 587-599 ◽  
Author(s):  
Ali O. Atahan
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Full Scale ◽  
Nonlinear Finite Element ◽  
Crash Test ◽  
Original Design ◽  
Dynamic Interactions ◽  
Crash Testing ◽  
Element Simulation ◽  
Test Requirements

Computer simulation of vehicle collisions has improved significantly over the past decade. With advances in computer technology, nonlinear finite element codes, and material models, full-scale simulation of such complex dynamic interactions is becoming ever more possible. In this study, an explicit three-dimensional nonlinear finite element code, LS-DYNA, is used to demonstrate the capabilities of computer simulations to supplement full-scale crash testing. After a failed crash test on a strong-post guardrail system, LS-DYNA is used to simulate the system, determine the potential problems with the design, and develop an improved system that has the potential to satisfy current crash test requirements. After accurately simulating the response behavior of the full-scale crash test, a second simulation study is performed on the system with improved details. Simulation results indicate that the system performs much better compared to the original design.

scholarly journals Particle Finite Element Simulation of Chip Formation in Cutting Processes

2017 ◽  
Vol 869 ◽  
pp. 50-61
Author(s):  
Matthias Sabel ◽  
Christian Sator ◽  
Ralf Müller ◽  
Benjamin Kirsch
Keyword(s):  
Finite Element ◽  
Structural Integrity ◽  
Large Deformations ◽  
Element Formulation ◽  
Particle Finite Element Method ◽  
Element Simulation ◽  
Modeling Techniques ◽  
Cutting Processes ◽  
The Impact ◽  
Cutting Simulations

The formation of chips in cutting processes is characterised by large deformations and large configurational changes and therefore challenges established modeling techniques. To overcome these difficulties, the particle finite element method (PFEM) combines the benefits of discrete modeling techniques with methods based on continuum mechanics. In this work an outline of the PFEM, as well as an explanation of the finite element formulation are provided. The impact of the boundary detection on the structural integrity is studied. The numerical examples include a tensile test as well as cutting simulations. The paper is concluded by a comparison of cutting forces with analytical results.

Nanoscale thermal mapping of few-layer organic crystals

CrystEngComm ◽  
2019 ◽  
Vol 21 (36) ◽  
pp. 5402-5409
Author(s):  
Ying Zhang ◽  
Cong Zhang ◽  
Dacheng Wei ◽  
Xue Bai ◽  
Xiangfan Xu
Keyword(s):  
Thin Film ◽  
Finite Element ◽  
Finite Element Simulation ◽  
Organic Crystals ◽  
Organic Thin Film ◽  
Thermal Mapping ◽  
Element Simulation

Combining a scanning thermal microscope with a finite element simulation, the conductivity of an organic thin-film can be quantitatively detected.

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