scholarly journals Finite Element Simulation and X-Ray Microdiffraction Study of Strain Partitioning in a Layered Nanocomposite

2016 ◽  
Vol 2016 ◽  
pp. 1-11
Author(s):  
R. I. Barabash ◽  
V. Agarwal ◽  
S. Koric ◽  
I. Jasiuk ◽  
J. Z. Tischler
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Three Dimensional ◽  
Growth Direction ◽  
Strain Partitioning ◽  
X Ray ◽  
Element Simulation ◽  
Dependent Strain ◽  
Residual Strains ◽  
Three Dimensional Simulations

The depth-dependent strain partitioning across the interfaces in the growth direction of the NiAl/Cr(Mo) nanocomposite between the Cr and NiAl lamellae was directly measured experimentally and simulated using a finite element method (FEM). Depth-resolved X-ray microdiffraction demonstrated that in the as-grown state both Cr and NiAl lamellae grow along the 111 direction with the formation of as-grown distinct residual ~0.16% compressive strains for Cr lamellae and ~0.05% tensile strains for NiAl lamellae. Three-dimensional simulations were carried out using an implicit FEM. First simulation was designed to study residual strains in the composite due to cooling resulting in formation of crystals. Strains in the growth direction were computed and compared to those obtained from the microdiffraction experiments. Second simulation was conducted to understand the combined strains resulting from cooling and mechanical indentation of the composite. Numerical results in the growth direction of crystal were compared to experimental results confirming the experimentally observed trends.

scholarly journals Residual Stress Evaluation of Carburized Transmission Steel Gear Using Neutron and Synchrotron X-Ray Diffraction and Finite Element Methods

2010 ◽  
Vol 652 ◽  
pp. 31-36 ◽  
Author(s):  
Yoshihisa Sakaida ◽  
Takanori Serizawa ◽  
M. Kawauchi ◽  
M. Manzanka
Keyword(s):  
Finite Element Method ◽  
Residual Stress ◽  
Finite Element ◽  
Neutron Diffraction ◽  
Carbon Content ◽  
Residual Strain ◽  
Stress Fields ◽  
X Ray ◽  
Residual Strains ◽  
Transmission Gear

A motorcycle transmission gear of chromium-molybdenum steel with 0.2%C was carburized in carrier gas. Carburizing process including heating, carburizing, diffusing and quenching was simulated using elastoplastic finite element method. The carbon content, hardness, residual strain and residual stress fields of gear were analyzed. The unstressed lattice plane spacing and residual strains of the interior near the internal spline of gear were experimentally measured by synchrotron x-ray and neutron diffraction methods. As a result, the analyzed carbon content and hardness gradients of gear accorded with the experimental results. The radial, hoop and axial directions of cylindrical gear were found to be not always principal axes of residual stress field. On the other hand, the analyzed residual strains in the radial, hoop and axial directions of gear slightly discorded with the experimental results. Although correlation between the measured three strains was similar to that of the weighted average of analyzed strains, residual strain and stress fields of motorcycle transmission gear could not be accurately predicted at the present finite element analysis. It was concluded that carbon diffusion phenomenon and resultant hardening could be analyzed by the finite element method, and the actual interior residual strain and stress fields should be nondestructively measured by neutron diffraction method.

Three-Dimensional Temperature Field of Mixer Chamber Analysis

2011 ◽  
Vol 221 ◽  
pp. 495-504
Author(s):  
Hui Guang Bian ◽  
Chuan Sheng Wang ◽  
Rui Qin Wang ◽  
Zhen Zhen Wang ◽  
Jun Ling Zhang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Temperature Field ◽  
Three Dimensional ◽  
Mixing Process ◽  
The Finite Element Method ◽  
Element Simulation ◽  
Chamber Temperature ◽  
Forced Cooling ◽  
Mixer Chamber

This paper analyzes the three-dimensional temperature field of mixer chamber during the mixing process by using the finite element method. The paper focuses on analyzing the three-dimensional temperature field of mixer chamber, the distribution of heat transferring, and the influence of forced cooling on the mixing temperature, and has verified by experiment the accuracy of finite element simulation of mixer chamber temperature.

Nanometric Scale Investigation of Local Strain in GaInAs Islands by High Resolution and Analytical TEM

2002 ◽  
Vol 8 (4) ◽  
pp. 312-318 ◽  
Author(s):  
J.Y. Laval ◽  
S. Kret ◽  
C. Delamarre ◽  
P. Bassoul ◽  
T. Benabbas ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Cross Sections ◽  
Molecular Beam ◽  
Local Strain ◽  
Growth Direction ◽  
The Finite Element Method ◽  
X Ray ◽  
Indium Concentration ◽  
Continuous Displacement

The continuous displacement field within elastically relaxed GaInAs islands was calculated from digitized HREM images of {110} cross sections of In0.35Ga0.65As layers grown on GaAs by molecular beam epitaxy. Experimental maps of the deformations parallel to the interface (εx) and along the growth direction (εz) were drawn and compared with the ones calculated via the finite element method. It was found that εx exp was systematically higher than εx calc and the significant maximum observed for εz exp within the island could not be found for εz calc. These discrepancies were attributed to a variation of the chemical composition in the island. The maps showing the indium concentration gradient drawn from HREM and FE calculations were compared to quantitative profiles for indium concentration obtained by nanometric X-ray microanalysis in TEM. The measured gradient within the island backs our assumption.

Research on the Influence of Conical Anvil on Upsetting Process of Forging by Finite Element Simulation

2012 ◽  
Vol 472-475 ◽  
pp. 1870-1873
Author(s):  
Yong Hua Li ◽  
Jing Zhang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Element Simulation ◽  
Compressive Stress ◽  
Deformation Zone ◽  
Three Dimensional ◽  
Rigid Zone ◽  
Element Simulation ◽  
Stress States ◽  
Critical Reduction

The upsetting process of cylindrical forging was investigated using finite element method. The influence of conical anvil on deformation rule of metal and distribution of strain and stress was studied using software MSC. Marc. The simulated results indicated that it had a smaller rigid zone and more homogeneous deformation zone in the billet during upsetting process with conical anvil compared with flat anvil. The critical reduction in height which could assure the three dimensional compressive stress states for the upsetting with conical anvil was smaller than that for the flat one.

Vibrational and thermoelastic behavior of punched-beam micro resonators containing odd-number of slots

2017 ◽  
Vol 232 (16) ◽  
pp. 2821-2829 ◽  
Author(s):  
Saeid Asadi ◽  
Mahdi Moghimi Zand ◽  
Tahereh Fanaei Sheikholeslami
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Resonant Frequency ◽  
Quality Factor ◽  
Three Dimensional ◽  
Resonant Mode ◽  
Comsol Multiphysics ◽  
Beam Length ◽  
Microelectromechanical System ◽  
Three Dimensional Simulations

Thermoelastic quality factor is an important mechanism for determining quality factor of a microelectromechanical system resonator, which works in near vacuum, and the resonant frequency is an important characteristic of a resonator. This paper studies variations of the thermoelastic quality factor and the resonant frequency of three- and five-slotted clamped-clamped beam microelectromechanical system resonators. The study has been done by using three-dimensional simulations based on finite element method by COMSOL Multiphysics. Resonant frequency is a function of stiffness and mass of the beam, therefore punching slots in the beam changes the resonant frequency. In addition, slots usually decrease the amount of coupling between mechanical resonant mode and thermal modes, thus improve the thermoelastic quality factor. The C–C beam lengths are considered to be 30.5 µm, 100 µm, and 400 µm. The results show the resonant frequency and corresponding thermoelastic quality factor of the three-slotted beams are greater than five-slotted beams, and a maximum resonant frequency of the three-slotted beams is achieved when the length of inner slot is about 32%–36% of the beam length.

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