Time-dependent numerical model for localised zinc corrosion

2011 ◽  
Author(s):  
A. Demeter ◽  
V. Topa ◽  
J. Deconinck
Keyword(s):  
Numerical Model ◽  
Time Dependent ◽  
Zinc Corrosion

scholarly journals Dynamic Pulse Buckling of Composite Stanchions in the Sub-Cargo Floor Area of a Civil Regional Aircraft

Materials ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 3594
Author(s):  
Andrea Sellitto ◽  
Francesco Di Caprio ◽  
Michele Guida ◽  
Salvatore Saputo ◽  
Aniello Riccio
Keyword(s):  
Numerical Model ◽  
Numerical Models ◽  
Low Frequency ◽  
Time Dependent ◽  
Structural Behavior ◽  
Cyclic Loads ◽  
Civil Aircraft ◽  
Compressive Loads ◽  
Pulse Buckling ◽  
Implicit And Explicit

This work is focused on the investigation of the structural behavior of a composite floor beam, located in the cargo zone of a civil aircraft, subjected to cyclical low-frequency compressive loads with different amplitudes. In the first stage, the numerical models able to correctly simulate the investigated phenomenon have been defined. Different analyses have been performed, aimed to an exhaustive evaluation of the structural behavior of the test article. In particular, implicit and explicit analyses have been considered to preliminary assess the capabilities of the numerical model. Then, explicit non-linear analyses under time-dependent loads have been considered, to predict the behavior of the composite structure under cyclic loading conditions. According to the present investigation, low-frequency cyclic loads with peak values lower than the static buckling load value are not capable of triggering significant instability.

The Effect of Thermal Field on the Deposition of Fe-TiC on Carbon Steel Using Laser Cladding

2010 ◽  
Author(s):  
Masoud Alimardani ◽  
Ali Emamian ◽  
Amir Khajepour ◽  
Stephen F. Corbin
Keyword(s):  
Carbon Steel ◽  
Numerical Model ◽  
Laser Cladding ◽  
Thermal Field ◽  
Deposition Process ◽  
Time Dependent ◽  
Experimental Investigations ◽  
Thermal Fields ◽  
Temperature Distributions ◽  
Laser Cladding Process

In this paper, a numerical and experimental method is used to investigate the effect of thermal fields on the deposition of Fe-TiC using the laser cladding process. Since in laser cladding temperature distributions and consequent rapid cooling rates determine the microstructure and final physical properties of the deposited layers, a 3D time-dependent numerical model is used to simulate the cladding process parallel to experimental analysis. The numerical results are used to study the temperature distributions and their evolutions throughout the deposition process. The experimental and verified numerical outcomes are then employed to study the variations of the microstructures of the deposited material as well as correlation between the formed microstructures and temperature distributions across the deposition domain. The numerical and experimental investigations are conducted through the deposition of Fe-TiC on the substrate of AISI 1030 carbon steel using a 1.1 kW fiber laser. The experimental results confirm that by increasing the substrate temperature throughout the process the distribution of the TiC particles changes along with the deposited tracks and the TiC particles start forming clusters at the top of the clad.

3-D time-dependent numerical model of flow patterns within a large-scale Czochralski system

2008 ◽  
Vol 310 (7-9) ◽  
pp. 2126-2133 ◽  
Author(s):  
Phil-Ouk Nam ◽  
Sang-Kun O ◽  
Kyung-Woo Yi
Keyword(s):  
Numerical Model ◽  
Large Scale ◽  
Flow Patterns ◽  
Time Dependent

scholarly journals Time-dependent numerical model for simulating internal oscillations in a sea organ

2020 ◽  
Vol 205 ◽  
pp. 107336
Author(s):  
Nino Krvavica ◽  
Gabrijel Peroli ◽  
Igor Ružić ◽  
Nevenka Ožanić
Keyword(s):  
Numerical Model ◽  
Time Dependent

Einfluss einer Reibhysterese auf selbsterregte Schwingungen von Partikel-Festkörper-Systemen

2021 ◽  
Vol 68 (3-4) ◽  
pp. 50-57
Author(s):  
Thomas Fürstner ◽  
Matthias Kröger
Keyword(s):  
Numerical Model ◽  
Time Dependent ◽  
Smooth Transition ◽  
Test Rig ◽  
Friction Behavior ◽  
Stick Slip ◽  
Dependent Behavior ◽  
Average System ◽  
Pmma Particles ◽  
Solid System

The influence of a friction hysteresis on the self-exciting in a particle-solid-system will be investigated by experiments and a numerical model. For this, a test rig will be presented. This test rig allows to measure the actual acting friction force. Furthermore, a numerical model will be presented which has a differentiation between a time-dependent friction behavior in sliding and sticking. Bigger differences can be observed in the system behavior – even with a quality similar curve of the measured friction hysteresis. For example, in a system with PVC-W particles exists a sharp boundary between an area of stable stick-slip oscillation and an area of subsiding oscillation. In comparison to this, a system with PMMA particles has a smooth transition region between these two areas. The followed simulation studies shown, that the selfexciting mechanism is a complex interaction between the time-dependent behavior during the sliding and sticking and the external average system velocity.

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