Finite Element Analysis of Moisture Diffusion into Sandwich Composite Using Thermal-Mass Diffusion Analogy

2018 ◽  
Author(s):  
BALAKUMARAN GOPALARETHINAM ◽  
MARK E. TUTTLE
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Moisture Diffusion ◽  
Mass Diffusion ◽  
Sandwich Composite ◽  
Thermal Mass ◽  
Element Analysis

scholarly journals Finite element analysis of mild steel - rubber sandwich composite material

2018 ◽  
Vol 376 ◽  
pp. 012040 ◽  
Author(s):  
Y P Ravitej ◽  
V Swaroop ◽  
S Ramesh ◽  
H Adarsha ◽  
Veerachari ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Composite Material ◽  
Mild Steel ◽  
Sandwich Composite ◽  
Element Analysis

Three Dimensional Transient Finite Element Analysis for Microstructure Formation and Residual Stresses in Double-Pass Laser Aided DMD Process

2004 ◽  
Author(s):  
S. Ghosh ◽  
J. Choi
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Heat Flow ◽  
Thermal Stresses ◽  
High Energy ◽  
Mass Diffusion ◽  
Mushy Region ◽  
Element Analysis ◽  
Energy Beam ◽  
Solid Liquid

Despite immense advances in Laser Aided Direct Metal/Material Deposition (LADMD) process many issues concerning the effects of process parameters on the stability of variety of properties and the integrity of microstructure have been reported. Modeling of heat flow seems to be a standard practice to couple heat flow calculations to related macroscopic phenomena such as fluid flow in the melt and solid-liquid mushy region, macrosegregation and thermal stresses. A key component in these models is the coupling between thermal and solute fields. Like macrostructural phenomena even microstructural features such as phase appearance, morphology, grain size or spacing are certainly no less important. The focus of this paper is the solute transport, in particular the manner in which process scale transport is coupled to transport at the local scale of the solid-liquid interface which requires a modeling of the redistribution of solutes at the scale of the secondary arm spaces in the dendritic mushy region. Basic microsegregation models which assume either no mass diffusion in the solid (Gulliver-Scheil) or complete diffusion in the solid (equilibrium lever rule) in a fixed arm space are inappropriate in high energy beam processes involving significantly high cooling rates. This paper aims at incorporating a model that accounts for finite mass diffusion and coarsening of the arm space. Due to the complexity and nonlinearity of LADMD process, analytical solutions can rarely address the practical manufacturing process. Consequently, this is an attempt towards a methodology of finite element analysis to predict solidification microstructure and thermal stresses. The simulation has been carried out for H13 tool steel deposited on a mild steel substrate. However, the program can easily be extended to a wide variety of steels.

Influence of the Honeycomb Geometry on the Sandwich Composite Plate Behavior

2017 ◽  
Vol 1143 ◽  
pp. 139-144 ◽  
Author(s):  
Florentina Rotaru ◽  
Ionel Chirica ◽  
Elena Felicia Beznea
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Sandwich Plate ◽  
Compressive Loading ◽  
Sandwich Composite ◽  
Orthotropic Materials ◽  
Honeycomb Core ◽  
Element Analysis ◽  
Composite Sandwich ◽  
The Impact

In this paper the influence cell honeycomb geometry on the mechanical behaviour of a composite sandwich plate is analyzed. Three cell geometries (circular, hexagonal and square) are static analysed so that to select the best type of honeycomb that will be used in the manufacturing the sandwich plate core. The main aim is to develop approach models of equivalent orthotropic materials to replace the real model of honeycomb core with their properties so that to quickly calculate the sandwich plate made out of composite when is used a finite element analysis code. Geometry and material properties of the honeycomb are delivered by the material provider. Comparative analysis, by using Finite element analysis is performed for all geometries, in the same boundary conditions. Since in the impact loading of the composite sandwich plate the core is mainly loaded to compression, comparative study of the three cell geometries honeycomb was performed for this type of compressive loading. Since the cell is the basic element of the honeycomb core, the calculus is performed for one unit volume of sandwich, concerning also the part of skins.

scholarly journals Modeling of Moisture Diffusion in Carbon Braided Composites

2008 ◽  
Vol 2008 ◽  
pp. 1-10 ◽  
Author(s):  
S. Laurenzi ◽  
T. Albrizio ◽  
M. Marchetti
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Diffusion Processes ◽  
Moisture Diffusion ◽  
Element Model ◽  
Maximum Error ◽  
Average Error ◽  
Braided Composites ◽  
Element Analysis ◽  
Commercial Code

In this study, we develop a methodology based on finite element analysis to predict the weight gain of carbon braided composite materials exposed to moisture. The analysis was based on the analogy between thermal conduction and diffusion processes, which allowed for a commercial code for finite element analysis to be used. A detailed finite element model using a repetitive unit cell (RUC) was developed both for bundle and carbon braided composites. Conditioning tests were performed to estimate the diffusivity of both the resin and composite. When comparing numerical and experimental results, it was observed that the procedure introduces an average error of 20% and a maximum error of 31% if the RUC is assumed to be isotropic. On the other hand, the average error does not exceed 10% and the maximum error is less than 20% when the material is considered as orthotropic. The procedure is independent of the particular fiber architecture and can be extended to other composites.

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