Development of the Finite Element Modeling Markup Language

2002 ◽  
Author(s):  
J. G. Michopoulos
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Element Model ◽  
Data Interpretation ◽  
Markup Language ◽  
Document Type ◽  
Element Modeling ◽  
Type Definition ◽  
Extensible Markup ◽  
Modeling Data

The finite element modeling Markup Language (femML) effort is addressing the problems of data interpretation and exchange for intra- and inter- application interoperability in the Finite Element Modeling domain. This is achieved through the development of an extensible markup language (XML) variant for finite element model data that will permit the storage, transmission, and processing of finite element modeling data distributed via the World Wide Web and related infrastructure technologies. The focus of this work was to utilize the XML’s power of semantic encapsulation along with the existing and continuously improving associated technology to develop a dialect for exchanging FEM data across various codes with heterogeneous input format syntactic specifications. The main aspects of a finite element definition have been used as archetypes for defining the XML element taxonomy definitions. Namely, the geometry, the material, and the loading aspects of a structural component specification are used to define the first level elements of the associated Document Type Definition (DTD). The element list has been amended with a behavior element specification that represents the solution data to be exchanged or visualized. Various tools have been developed to demonstrate associated concepts along with the ANSYS set of tools.

Determining the Rayleigh damping parameters of flexible pavements for finite element modeling

2021 ◽  
pp. 107754632110267
Author(s):  
Jiandong Huang ◽  
Xin Li ◽  
Jia Zhang ◽  
Yuantian Sun ◽  
Jiaolong Ren
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Natural Frequencies ◽  
Least Squares Method ◽  
Element Model ◽  
Beam Model ◽  
Element Modeling ◽  
Rayleigh Damping ◽  
Damping Matrix

The dynamic analysis has been successfully used to predict the pavement response based on the finite element modeling, during which the stiffness and mass matrices have been established well, whereas the method to determine the damping matrix based on Rayleigh damping is still under development. This article presents a novel method to determine the two parameters of the Rayleigh damping for dynamic modeling in pavement engineering. Based on the idealized shear beam model, a more reasonable method to calculate natural frequencies of different layers is proposed, by which the global damping matrix of the road pavement can be assembled. The least squares method is simplified and used to calculate the frequency-independent damping. The best-fit Rayleigh damping is obtained by only determining the natural frequencies of the two modal. Finite element model and in-situ field test subjected by the same falling weight deflectometer pulse loads are performed to validate the accuracy of this method. Good agreements are noted between simulation and field in-situ results demonstrating that this method can provide a more accurate approach for future finite element modeling and back-calculation.

Experimentally validated predictive finite element modeling of the V0-V100 probabilistic penetration response of a Kevlar fabric against a spherical projectile

2018 ◽  
Vol 9 (4) ◽  
pp. 504-524 ◽  
Author(s):  
Gaurav Nilakantan
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Finite Element Modeling ◽  
Element Model ◽  
Ballistic Impact ◽  
Impact Testing ◽  
Woven Fabric ◽  
Projectile Impact ◽  
Element Modeling ◽  
The Impact

This work presents the first fully validated and predictive finite element modeling framework to generate the probabilistic penetration response of an aramid woven fabric subjected to ballistic impact. This response is defined by a V0-V100 curve that describes the probability of complete fabric penetration as a function of projectile impact velocity. The exemplar case considered in this article comprises a single-layer, fully clamped, plain-weave Kevlar fabric impacted at the center by a 0.22 cal spherical steel projectile. The fabric finite element model comprises individually modeled three-dimensional warp and fill yarns and is validated against the experimental material microstructure. Sources of statistical variability including yarn strength and modulus, inter-yarn friction, and precise projectile impact location are mapped into the finite element model. A series of impact simulations at varying projectile impact velocities is executed using LS-DYNA on the fabric models, each comprising unique mappings. The impact velocities and outcomes (penetration, non-penetration) are used to generate the numerical V0-V100 curve which is then validated against the experimental V0-V100 curve obtained from ballistic impact testing and shown to be in excellent agreement. The experimental data and its statistical analysis used for model input and validation, namely, the Kevlar yarn tensile strengths and moduli, inter-yarn friction, and fabric ballistic impact testing, are also reported.

scholarly journals Finite Element Modeling and Mechanical Behavior of Masonry-Infilled RC Frame

2016 ◽  
Vol 10 (1) ◽  
pp. 76-92
Author(s):  
Hongyu Deng ◽  
Baitao Sun
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Element Model ◽  
Simulation Method ◽  
Shear Resistance ◽  
Calculation Formula ◽  
Infill Wall ◽  
Seismic Code ◽  
Element Modeling ◽  
Contact Position

During the analysis of reinforced concrete structures, the infill wall is usually simplified as a diagonal inclined strut to facilitate finite element modeling calculations. However, the actual seismic damage and single frame-filled wall pushover experimental results show that when the earthquake shear force is huge, the top of the infill wall and the beam–column connections are usually, thus the path of the force transfer will be changed. Based on this actual failure phenomenon, a new calculation model which has different contact position between the equivalent bracing walls and the frame columns is generated. Thus, the force analysis is given based on this model, the formulae for calculating the equivalent width of bracing walls, the shear bearing capacity of the wall-filled frame, and the infill wall’s actual participation in the stiffness. A finite element simulation method by ABAQUS is used to determine an empirical formula for calculating the reasonable contact position between the equivalent bracing walls and the frame columns. The verification results show that the finite element model presented in this paper is more reasonable, and the stiffness and shear resistance of infill wall should not be neglected. The calculation formula of stiffness of infill wall presented in this paper is coincided with seismic code. But the calculation formula of shear resistance of infill wall presented in seismic code is higher than the actual value, so it is suggested that calculation formula presented in this paper should be accepted.

Advances of the Finite Element Modeling Markup Language

2005 ◽  
Author(s):  
J. G. Michopoulos ◽  
R. Martin ◽  
B. Anto
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Data Exchange ◽  
Current Status ◽  
Markup Language ◽  
Modeling And Analysis ◽  
Element Modeling ◽  
Address Data ◽  
Model Editing ◽  
Model Visualization

Development of the finite element modeling Markup Language (femML) was motivated by the need to address data exchange issues associated with intra- and inter-application interoperability in the context of finite element modeling and analysis. This paper describes femML advances during the past four years and describes current status of various tools and technologies associated with femML. In particular, the current schema is described along with XSLT-based translation of femML to SVG and X3D for quick model visualization. Java, C++ and Visual Basic tools have been developed for model editing and visualization as well. The paper concludes with identification of standing issues to be resolved relative to femML’s evolution and the future directions and plans about further evolution of femML.

2D Meso-Scale Finite Element Modeling and Simulation of Polymer-Mineral Composite Material

2016 ◽  
Vol 848 ◽  
pp. 3-8
Author(s):  
Pei Yao Sheng ◽  
Shi Zhao Wang ◽  
Zhong Ji
Keyword(s):  
Finite Element ◽  
Composite Material ◽  
Numerical Analysis ◽  
Finite Element Modeling ◽  
Epoxy Resin ◽  
Element Model ◽  
Fe Model ◽  
Element Modeling ◽  
Low Thermal Expansion ◽  
Meso Scale

Polymer-mineral composite material is prepared by using modified epoxy resin as binder and mineral particles as aggregates. Its excellent damping characteristic and low thermal expansion make it ideal in manufacturing machine tool beds. However, the properties of this material depend on its formula and structure, so it is very important to develop an efficient method to numerically model the materials and then to optimize their properties. In this paper, 2D meso-scale finite element modeling is presented for numerical analysis of the mechanical properties of polymer-mineral composite material. The material was treated as a 2-phase composite composed of aggregates and binder which was epoxy resin mixed with fillers. Based on grading curve, the weights of aggregates were converted into the corresponding area, the aggregate particles were randomly generated and assembled with binder to produce the model. And then 2D numerical simulations were conducted under different gradations. The results show that: (1) the 2D FE model is very close to the real polymer-mineral composite material in the aspect of density and aggregate shapes and sizes, which validate the fidelity of the generated finite element model and numerical analysis method; (2) by comparing the materials’ properties under four different gradations, it can be found that the materials with SAC gradation have the best mechanical property.

BOUNDARY CONDITIONS IN FINITE ELEMENT MODELING OF STRATIFIED COASTAL CIRCULATION

1988 ◽  
Vol 1 (21) ◽  
pp. 190
Author(s):  
George C. Christodoulou ◽  
George D. Economou
Keyword(s):  
Finite Element ◽  
Boundary Conditions ◽  
Finite Element Model ◽  
Finite Element Modeling ◽  
Coastal Waters ◽  
Stratified Flow ◽  
Element Model ◽  
Numerical Computations ◽  
Element Modeling ◽  
Sponge Layer

The effect of boundary conditions on numerical computations of stratified flow in coastal waters is examined. Clamped, free radiation and sponge layer conditions are implemented in a two-layer finite element model and the results of simple tests in a two-layer stratified basin are presented.

scholarly journals Finite element modeling of shape memory polyurethane foams for treatment of cerebral aneurysms

2021 ◽  
Author(s):  
H. R. Jarrah ◽  
A. Zolfagharian ◽  
M. Bodaghi
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Shape Memory ◽  
Cerebral Aneurysms ◽  
Element Model ◽  
Polyurethane Foams ◽  
Patient Specific ◽  
Structural Cell ◽  
Element Modeling ◽  
Shape Memory Polyurethane

AbstractIn this paper, a thermo-mechanical analysis of shape memory polyurethane foams (SMPUFs) with aiding of a finite element model (FEM) for treating cerebral aneurysms (CAs) is introduced. Since the deformation of foam cells is extremely difficult to observe experimentally due to their small size, a structural cell-assembly model is established in this work via finite element modeling to examine all-level deformation details. Representative volume elements of random equilateral Kelvin open-cell microstructures are adopted for the cell foam. Also, a user-defined material subroutine (UMAT) is developed based on a thermo-visco-elastic constitutive model for SMPUFs, and implemented in the ABAQUS software package. The model is able to capture thermo-mechanical responses of SMPUFs for a full shape memory thermodynamic cycle. One of the latest treatments of CAs is filling the inside of aneurysms with SMPUFs. The developed FEM is conducted on patient-specific basilar aneurysms treated by SMPUFs. Three sizes of foams are selected for the filling inside of the aneurysm and then governing boundary conditions and loadings are applied to the foams. The results of the distribution of stress and displacement in the absence and presence of the foam are compared. Due to the absence of similar results in the specialized literature, this paper is likely to fill a gap in the state of the art of this problem and provide pertinent results that are instrumental in the design of SMPUFs for treating CAs.

scholarly journals Numerical Modeling of Biological Oxygen Demand (BOD5) Load in Apa Mmini Stream

2020 ◽  
pp. 18-24
Author(s):  
Ogbebor Daniel ◽  
Nwaogazie L. Ify ◽  
Momoh O. L. Yusuf ◽  
Ndekwu B. Onyedikachukwu
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Stream Water ◽  
Oxygen Demand ◽  
Element Model ◽  
Biological Oxygen Demand ◽  
Element Modeling ◽  
Modeling Approach ◽  
Longitudinal Length ◽  
Pollution Modeling

Aim: The study aimed at utilizing finite element modeling approach for extrapolation of BOD5 along the longitudinal length of the stream. Study Design: The linear element method was used for analyzing the Biological Oxygen Demand (BOD) transport along the longitudinal length of the stream using the Advective dispersive equation (ADE) as the governing equation.  In this study, it was assumed that dispersion was negligible. Methodology: The BOD5 transport within the stream was modeled using finite element approach. The equation for the stream water pollution modeling was used and the descriptive variables are described as; D is the dispersion coefficient, C is the unknown or state variable (concentration of pollutant or dissolved salt), V is the velocity or convection parameter, k is the applied source or sink and t is the time coordinates. Results: Prediction results of the finite element model showed that BOD5 decreased downstream from the point of slaughterhouse effluent expulsion. It was observed that both the observed and predicted values of BOD5 correlated strongly with a correlation coefficient of 0.9686. The decrease in BOD5 downstream proves that there is a low rate of re-aeration of the stream; hence the effluent still exceeds the FMEnv recommended standard of 50 mg/l as it travels downstream along the stream profile. The prediction discloses that the river is highly polluted for long stretch of the watercourse, thus implying that selected system of treatment method must be put in place. Conclusion: Finite element modeling approach was utilized for the extrapolation of BOD5 in Apa Mmini stream. The outcomes of the simulation showed that the Apa Mmini stream is highly polluted with BOD5 of 111.8 mg/l which is far above the FMEnv recommended standard of 50 mg/l.

X-ray casting finite-element-modeling data

1996 ◽  
Author(s):  
Feng Dong ◽  
Wenli Cai ◽  
Jiaoying Shi
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Ray Casting ◽  
X Ray ◽  
Title X ◽  
Element Modeling ◽  
Modeling Data

Intelligent Automatic Mesh Generation for Multichip Modules

1993 ◽  
Author(s):  
Anagha G. Jog ◽  
Ian R. Grosse ◽  
Daniel D. Corkill
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Mesh Generation ◽  
A Priori ◽  
Three Dimensional ◽  
Element Model ◽  
Design Tool ◽  
Element Analysis ◽  
Modeling And Analysis ◽  
Element Modeling

Abstract Currently, the pre-processing stage of finite element analysis is a major stumbling block towards automation of the entire finite element modeling and analysis (FEMA) process. The lack of complete automation of FEMA greatly limits its impact as a design tool. This paper presents a blackboard-based, object-oriented modeling system for intelligent a-priori automatic three dimensional mesh generation. The modeling system enables the user to define the physical system at a natural domain-specific high level of abstraction and automatically derives lower-level finite element model representations. Knowledge sources interact with the blackboard to make modeling idealizations and select optimal meshing strategies. An example application in the domain of finite element modeling of multi-chip module microelectronic devices is presented.

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