Arbitrary Lagrangian Eulerian FEA Method to Predict Wavy Pattern and Weldability Window During Magnetic Pulsed Welding

2015 ◽  
Author(s):  
Ali Nassiri ◽  
Greg P. Chini ◽  
Brad L. Kinsey
Keyword(s):  
Experimental Investigations ◽  
Arbitrary Lagrangian Eulerian ◽  
Estimation Of Parameters ◽  
Lagrangian Analysis ◽  
Ale Method ◽  
Weldability Window ◽  
High Plastic Strain ◽  
High Plastic ◽  
High Strain Rate Forming ◽  
Significant Attention

Finite element simulations of high strain rate forming processes have received significant attention over the last decade. For instance, in Magnetic Pulsed Welding (MPW), extremely high plastic strain regions develop. Thus, a traditional pure Lagrangian analysis is not able to accurately model the process due to excessive element distortion near the contact zone. In this study, the Arbitrary Lagrangian Eulerian (ALE) method is used to simulate a MPW process while retaining a high-quality mesh. Also the ALE method was able to numerically predict the necessary process parameters to achieve a wavy pattern region for two Al6061-T6 plates impacted during the MPW process. The captured wavy pattern region in this study can be used as a first estimation of parameters necessary to achieve a successful MPW component and thus reduce trial and error experimental investigations.

scholarly journals Structural Stability of Functionalized Silicene Nanoribbons with Normal, Reconstructed, and Hybrid Edges

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Sadegh Mehdi Aghaei ◽  
Ingrid Torres ◽  
Irene Calizo
Keyword(s):  
Structural Stability ◽  
First Principles ◽  
Experimental Investigations ◽  
First Principles Calculations ◽  
Zigzag Edge ◽  
Edge Structure ◽  
Practical Applications ◽  
Potential Applications ◽  
Silicene Nanoribbons ◽  
Significant Attention

Silicene, a novel graphene-like material, has attracted a significant attention because of its potential applications for nanoelectronics. In this paper, we have theoretically investigated the structural stability of edge-hydrogenated and edge-fluorinated silicene nanoribbons (SiNRs) via first-principles calculations. Various edge forms of SiNRs including armchair edge, zigzag edge, Klein edge, reconstructed Klein edge, reconstructed pentagon-heptagon edge, and hybrid edges have been considered. It has been found that fully fluorinated Klein edge SiNRs, in which each edge Si atom is terminated by three fluorine atoms, are the most stable structure. We also discovered that a hybrid edge structure of trihydrogenated Klein edge and dihydrogenated zigzag edge can increase the nanoribbon’s stability up to that of dihydrogenated armchair edge SiNR, which is known as the most stable edge-hydrogenated structure. With the attractive properties of silicene for practical applications, the obtained results will advance experimental investigations toward the development of silicene based devices.

scholarly journals MPM and ALE Simulations of Large Deformations Geotechnics Instability Problems

DYNA ◽  
2020 ◽  
Vol 87 (212) ◽  
pp. 226-235
Author(s):  
Giovanna Monique Alelvan ◽  
Daniela Toro Rojas ◽  
Amanda Cristina Pedron Rossato ◽  
Raydel Lorenzo Reinaldo ◽  
Manoel Porfirio Cordão Neto
Keyword(s):  
Large Deformations ◽  
Material Point Method ◽  
Material Point ◽  
Large Displacements ◽  
Arbitrary Lagrangian Eulerian ◽  
Inclined Plane ◽  
Ale Method ◽  
Advantages And Disadvantages ◽  
Comparison Of The Results ◽  
The Continuum

Problems involving large deformations are the focus of numerical modeling researches in recent decades due to the challenge of finding a kinematic appropriate description of the continuum. In recent years, different formulations have been used to describe such problems as the Arbitrary Lagrangian Eulerian (ALE) method and the Material Point Method (MPM). These two methods allow to perform dynamic analyzes involving large deformations. In this way, this work aims to present a comparison of problems applied to Geotechnics involving large deformations and large displacements, using MPM and FEM associated with the ALE method. For this purpose, three problems are simulated: sliding of blocks on an inclined plane, runout process of sand and instability of a slope using the MPM and the FEM associated with the ALE method. In all cases a comparison of the results is presented, and the advantages and disadvantages of each method are discussed.

scholarly journals High Plastic Strain of Silica Microparticles under Electron Beam Irradiation

2014 ◽  
Vol 20 (S3) ◽  
pp. 1544-1545 ◽  
Author(s):  
Douglas Stauffer ◽  
Sanjit Bhowmick ◽  
Ryan Major ◽  
Oden L. Warren ◽  
S. A. Syed Asif
Keyword(s):  
Electron Beam ◽  
Plastic Strain ◽  
Electron Beam Irradiation ◽  
Beam Irradiation ◽  
Silica Microparticles ◽  
High Plastic Strain ◽  
High Plastic

A cell-centred arbitrary Lagrangian–Eulerian (ALE) method

2008 ◽  
Vol 56 (8) ◽  
pp. 1161-1166 ◽  
Author(s):  
Pierre-Henri Maire ◽  
Jérôme Breil ◽  
Stéphane Galera
Keyword(s):  
Arbitrary Lagrangian Eulerian ◽  
Ale Method ◽  
A Cell

Experimental Investigations on Explosive Cladding of Cp-Titanium / AISI 304 Stainless Steel

2008 ◽  
Vol 580-582 ◽  
pp. 629-632 ◽  
Author(s):  
Pezhman Farhadi Sartangi ◽  
Seiyed Ali Asghar Akbari Mousavi
Keyword(s):  
Intermetallic Layer ◽  
Dissimilar Materials ◽  
Composite Plates ◽  
304 Stainless Steel ◽  
Experimental Investigations ◽  
Aisi 304 ◽  
Explosive Cladding ◽  
Metallic Bond ◽  
Wavy Interface ◽  
Weldability Window

The purpose of this study is to produce composite plates by explosive cladding process. This is a process in which the controlled energy of explosives is used to create a metallic bond between two similar or dissimilar materials. The welding conditions were tailored through parallel geometry route by using different explosive ratios to produce both wavy and straight interfaces. In this investigation, a two-pronged study was adopted to establish the conditions required for producing successful solid state welding: (a) Analytical calculations to determine the weldability window; (b) Metallurgical investigations of experiments carried out under different conditions. The required parameters in the experiments were selected through numerical simulations. The analytical calculations confirm the experimental results. Optical microscopy studies show that a transition from a smooth to wavy interface occurs with increase in explosive ratio. Scanning electron microscopy studies show the formation of intermetallic layer in the interface.

Steel Plate Behavior under Blast Loading-Numerical Approach Using LS-DYNA

2016 ◽  
Vol 842 ◽  
pp. 200-207 ◽  
Author(s):  
Vu Minh Thanh ◽  
Sigit P. Santosa ◽  
Djarot Widagdo ◽  
Ichsan Setya Putra
Keyword(s):  
Blast Resistance ◽  
Blast Loading ◽  
Numerical Approach ◽  
Coupling Method ◽  
Steel Plates ◽  
Computational Time ◽  
Arbitrary Lagrangian Eulerian ◽  
Ale Method ◽  
Wide Range ◽  
Coupling Algorithm

Plate is one of the most common structural elements, which appears in a wide range of applications: steel bridges, blast-resistance door, and armored vehicles. In this paper, the behavior of steel plates under blast loading was studied through numerical approaches using LS DYNA and then the results were compared with the experiment results obtained from existing literatures. The study of a clamped square plate exposed to blast loading in three distinct stand-off distances. Three different methods of modeling blast loading were used, namely: empirical blast method, arbitrary Lagrangian Eulerian (ALE) method, and coupling of Lagrangian and Eulerian method. The empirical blast method was deployed by using key card *LOAD_BLAST in LS-DYNA. In ALE method, Langrangian and Eulerian solution were combined in the same model and the fluid-structure interaction (FSI) handled by coupling algorithm. In coupling method, the engineering load blast in LS-DYNA (*LOAD_BLAST_ENHANCED) was coupled with the ALE solver. In terms of central deflection and computational time, the coupling method appeared to be the best method which is very time-effective and showed a good correlation with the experiment data.

High Temperature Low-Cycle Fatigue, Deformation Microstructure and Final Fracture Behavior of a Nickel-Base Superalloy

2008 ◽  
Vol 378-379 ◽  
pp. 249-270 ◽  
Author(s):  
Du Yi Ye ◽  
Jin Yang Zheng
Keyword(s):  
Plastic Strain ◽  
Crack Propagation ◽  
Strain Amplitude ◽  
Low Cycle Fatigue ◽  
Cyclic Stress ◽  
Cycle Fatigue ◽  
Final Fracture ◽  
High Plastic Strain ◽  
Nickel Base ◽  
High Plastic

The low-cycle fatigue (LCF) properties of a nickel-base precipitation-strengthened superalloy (GH4145/SQ), obtained at a temperature of 538 o C, were reported and discussed in this paper. The properties investigated include cyclic stress response, fatigue life, deformation microstructure and final fracture features as a function of applied strain amplitude. It was shown that the alloy exhibited a pronounced initial hardening followed by continuous softening to failure at high plastic strain amplitudes ( > 0.2% ap ε ), while at low plastic strain amplitudes ( < 0.2% ap ε ) the initial hardening was followed by a well-defined saturation stage. Bilinear behavior with a change of slope at a plastic strain amplitude of about 0.2% was observed in the cyclic stress-strain (CSS) and Coffin-Manson (C-M) plots. TEM observations revealed that slip band density increased with increasing total strain amplitude and precipitate degradation resulting from dislocation-precipitate interactions took place with continuous cyclic straining. The change in the microstructure during cycling is thus responsible for the fatigue hardening / softening behavior of the alloy. SEM examinations indicated that at low plastic strain amplitudes ( < 0.2% ap ε ) crack propagation was basically transgranular, while at high plastic strain amplitudes ( > 0.2% ap ε ) crack propagation exhibited intergranular features, as a whole. The variation in both the number of operating slip systems and the fracture modes with the strain amplitude employed was used to explain the observed two-stage LCF behavior of the present investigated superalloy.

Application of an Arbitrary Lagrangian Eulerian Method to Describe High Velocity Gas-Particle Flow Behavior

2011 ◽  
Author(s):  
D. M. Fox ◽  
J. S. Lee
Keyword(s):  
High Velocity ◽  
High Speed ◽  
Flow Behavior ◽  
Constitutive Models ◽  
Experimental Investigations ◽  
Small Scale ◽  
Arbitrary Lagrangian Eulerian ◽  
High Velocity Flow ◽  
Solid Objects ◽  
Velocity Flow

Novel computational and small-scale experimental investigations were performed in order to better understand the high velocity flow behavior of gas-particle mixtures. The motion of solid objects impacted by the flow of the mixtures was measured by use of high-speed digital video photography. Computations were performed by use of an arbitrary Lagrangian Eulerian (ALE) treatment in a nonlinear finite element code. Constitutive models for description of the solid component of the gas-particle blend were developed based on quasi-statically determined test results. It was observed that there was very close agreement between experimental and computational results and that it was possible to accurately predict the high velocity flow behavior of the gas-particle mixture using quasi-statically determined constitutive models.

Comparison of Fluid Structure Interaction Capabilities in Finite Volume and Finite Element Based Codes

2020 ◽  
Author(s):  
Qiyue Lu ◽  
Alfonso Santiago ◽  
Seid Koric ◽  
Paula Cordoba
Keyword(s):  
Finite Element ◽  
Finite Volume ◽  
Fluid Structure Interaction ◽  
Arbitrary Lagrangian Eulerian ◽  
Fluid Structure ◽  
Ale Method ◽  
Structure Interaction ◽  
Commercial Code ◽  
Wide Range ◽  
Volume Method

Abstract Fluid-Structure Interaction (FSI) simulations have applications to a wide range of engineering areas. One popular technique to solve FSI problems is the Arbitrary Lagrangian-Eulerian (ALE) method. Both academic and industry communities developed codes to implement the ALE method. One of them is Alya, a Finite Element Method (FEM) based code developed in Barcelona Supercomputing Center (BSC). By analyzing the application on a simplified artery case and compared to another commercial code, which is Finite Volume Method (FVM) based, this paper discusses the mathematical background of the solver for domains, and carries out verification work on Alya’s FSI capability. The results show that while both codes provide comparable FSI results, Alya has exhibited better robustness due to its Subgrid Scale (SGS) technique for stabilization of convective term and the subsequent numerical treatments. Thus this code opens the door for more extensive use of higher fidelity finite element based FSI methods in future.

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