Fundamental FEM Modeling Approach of Residual Stress Propagation in Sn-Based Electroplated Films Prone to Sn Whiskers Growth

2016 ◽  
Vol 6 (5) ◽  
pp. 805-813 ◽  
Author(s):  
Aleksandra Fortier ◽  
Fanrong Kong ◽  
Radovan Kovacevic
Keyword(s):  
Residual Stress ◽  
Fem Modeling ◽  
Sn Whiskers ◽  
Modeling Approach ◽  
Stress Propagation

Spectral encoding of fluorescent emission from deeply lying inclusions - a FEM-modeling approach

2006 ◽  
Author(s):  
Johan Axelsson ◽  
Jenny Svensson ◽  
Ann Johansson ◽  
Stefan Andersson-Engels
Keyword(s):  
Fem Modeling ◽  
Fluorescent Emission ◽  
Modeling Approach ◽  
Spectral Encoding

NUMERICAL SIMULATION FOR SHOT-PEENING BASED ON SPH-COUPLED FEM

2011 ◽  
Vol 08 (04) ◽  
pp. 731-745 ◽  
Author(s):  
JIANMING WANG ◽  
FEIHONG LIU
Keyword(s):  
Residual Stress ◽  
Shot Peening ◽  
Compressive Residual Stress ◽  
Target Material ◽  
Material Model ◽  
Single Shot ◽  
Fem Modeling ◽  
Contact Algorithm ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

In dealing with shot-peening simulation, existing literatures adopt finite element method (FEM), which establishes models of a single shot or several shots only, thus the effect of a large number of shots repeat impacting and the influence among adjacent shots are ignored. To overcome these disadvantages of FEM models, smoothed particle hydrodynamics (SPH)-coupled FEM modeling is presented, in which the shots are modeled by SPH particles and the target material is modeled by finite elements. The two parts interact through contact algorithm to simulate a number of shots impinging the target. Utilizing this model, a material model for shots is established, the relationships between compressive residual stress and peening frequencies, coverage, and velocities are analyzed. Steady compressive residual stress can be obtained by multiple peening; higher coverage can improve the compressive residual stress; faster velocities can induce greater and deeper maximum residual stress in target subsurface. The simulation results agree well with the existing experimental data. The study would not only provide a new powerful tool for the simulation of shot-peening process, but also be benefit to optimize the operating parameters.

Evolution of residual stress and qualitative analysis of Sn whiskers with various microstructures

2015 ◽  
Vol 51 (7) ◽  
pp. 3600-3606 ◽  
Author(s):  
Hao Chen ◽  
Hsin Yi Lee ◽  
Ching Shun Ku ◽  
Albert T. Wu
Keyword(s):  
Residual Stress ◽  
Qualitative Analysis ◽  
Sn Whiskers

scholarly journals An Integrated Modeling Approach for Predicting Process Maps of Residual Stress and Distortion in a Laser Weld: A Combined CFD–FE Methodology

2016 ◽  
Vol 47 (5) ◽  
pp. 2954-2962
Author(s):  
Richard P. Turner ◽  
Chinnapat Panwisawas ◽  
Yogesh Sovani ◽  
Bama Perumal ◽  
R. Mark Ward ◽  
...  
Keyword(s):  
Residual Stress ◽  
Integrated Modeling ◽  
Laser Weld ◽  
Process Maps ◽  
Modeling Approach

Translating node of Ranvier currents to extraneural electrical fields: a flexible FEM modeling approach

2021 ◽  
Author(s):  
Fabiana Del Bono ◽  
Adrien Rapeaux ◽  
Danilo Demarchi ◽  
Timothy G. Constandinou
Keyword(s):  
Node Of Ranvier ◽  
Fem Modeling ◽  
Electrical Fields ◽  
Modeling Approach

scholarly journals Coupled SPH–FEM Modeling of Tsunami-Borne Large Debris Flow and Impact on Coastal Structures

2021 ◽  
Vol 9 (10) ◽  
pp. 1068
Author(s):  
Anis Hasanpour ◽  
Denis Istrati ◽  
Ian Buckle
Keyword(s):  
Turbulent Flows ◽  
Large Scale ◽  
Experimental Studies ◽  
Three Dimensional ◽  
Fem Modeling ◽  
Vertical Column ◽  
Initial Water ◽  
Modeling Approach ◽  
Non Linear ◽  
The Impact

Field surveys in recent tsunami events document the catastrophic effects of large waterborne debris on coastal infrastructure. Despite the availability of experimental studies, numerical studies investigating these effects are very limited due to the need to simulate different domains (fluid, solid), complex turbulent flows and multi-physics interactions. This study presents a coupled SPH–FEM modeling approach that simulates the fluid with particles, and the flume, the debris and the structure with mesh-based finite elements. The interaction between the fluid and solid bodies is captured via node-to-solid contacts, while the interaction of the debris with the flume and the structure is defined via a two-way segment-based contact. The modeling approach is validated using available large-scale experiments in the literature, in which a restrained shipping container is transported by a tsunami bore inland until it impacts a vertical column. Comparison of the experimental data with the two-dimensional numerical simulations reveals that the SPH–FEM models can predict (i) the non-linear transformation of the tsunami wave as it propagates towards the coast, (ii) the debris–fluid interaction and (iii) the impact on a coastal structure, with reasonable accuracy. Following the validation of the models, a limited investigation was conducted, which demonstrated the generation of significant debris pitching that led to a non-normal impact on the column with a reduced contact area and impact force. While the exact level of debris pitching is highly dependent on the tsunami characteristics and the initial water depth, it could potentially result in a non-linear force–velocity trend that has not been considered to date, highlighting the need for further investigation preferably with three-dimensional models.

TEM investigations of surface residual stress relaxation in A12O3 and Al2O3-SiC nanocomposite

1994 ◽  
Vol 52 ◽  
pp. 628-629
Author(s):  
J. Fang ◽  
H. M. Chan ◽  
M. P. Harmer
Keyword(s):  
Residual Stress ◽  
Single Phase ◽  
Stress Relief ◽  
Stress Recovery ◽  
Surface Residual Stress ◽  
Microscopic Mechanism ◽  
Sic Particles ◽  
Annealing Procedure ◽  
The Difference ◽  
Nano Size

It was Niihara et al. who first discovered that the fracture strength of Al2O3 can be increased by incorporating as little as 5 vol.% of nano-size SiC particles (>1000 MPa), and that the strength would be improved further by a simple annealing procedure (>1500 MPa). This discovery has stimulated intense interest on Al2O3/SiC nanocomposites. Recent indentation studies by Fang et al. have shown that residual stress relief was more difficult in the nanocomposite than in pure Al2O3. In the present work, TEM was employed to investigate the microscopic mechanism(s) for the difference in the residual stress recovery in these two materials.Bulk samples of hot-pressed single phase Al2O3, and Al2O3 containing 5 vol.% 0.15 μm SiC particles were simultaneously polished with 15 μm diamond compound. Each sample was cut into two pieces, one of which was subsequently annealed at 1300° for 2 hours in flowing argon. Disks of 3 mm in diameter were cut from bulk samples.

Residual stress measurements and modeling of built-up Box-T sections

2021 ◽  
Vol 160 ◽  
pp. 107336
Author(s):  
Ziqian Zhang ◽  
Gang Shi ◽  
Xuesen Chen ◽  
Lijun Wang ◽  
Le Zhou
Keyword(s):  
Residual Stress ◽  
Stress Measurements
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