Irwan Katili

Irwan Katili
University of Indonesia | UI

Prof. Dr. Ir.

About

39
Publications
5,194
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718
Citations
Citations since 2016
27 Research Items
471 Citations
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100

Publications

Publications (39)
Article
This paper presents a discrete shear quadrilateral (DSQ) element to study the static bending, free vibration, and buckling analysis of functionally graded material plate structures. The effective properties of the FGM plate are computed using the rule of mixtures. The plate kinematics is based on Resinner-Mindlin plate theory with discrete shear co...
Article
Full-text available
This paper deals with the presentation of a general, variational principle as theoretical support for the development of simple and efficient triangular elements having only one displacement and two rotations at the corner nodes to model thin to thick plates based on the first order Reissner- Mindlin plate theory. The functional is a modified Helli...
Article
Full-text available
This paper presents the convergence behavior of Discrete Kirchhoff Mindlin Triangular (DKMT) element in buckling analysis under uniaxial compression of square plate problems. The DKMT element has a good result for a thin plate and a thick plate. For the Functionally Graded Material (FGM) problem, the DKMT element is reformulated. FGM is a graded co...
Article
Full-text available
Functionally Graded Material in one type of material that currently gets much attention in the civil engineering field because it is claimed as the material that can resist the high-temperature environment. FGM is consist of two or more material that continuously changed along the thickness direction of the structure. FGM is often formed by ceramic...
Article
In the present paper, a shear-locking free quadrilateral element with 5 DOFs per node, called Q4γs, is developed using a discrete shear projection method (DSPM). Independent transverse shear strains are formulated using a tangential coordinate system, and discrete shear strains are applied along each of element sides to get the constant shear strai...
Conference Paper
This paper will study the convergence of the Functionally Graded Material (FGM) on plates. FGM plates are a combination of two or more materials that change continuously along with the thickness of the plate. As a result, unlike normal composite, there will be no delamination on the FGM plate. The triangular Discrete Shear Gap (DSG3) element is use...
Article
The paper presents an extension of the Certain Generalized Stresses Method (CGSM) for the static finite element analysis of homogeneous and laminated shells with variability. The basic assumption is that the generalized stresses do not depend on input parameters perturbation. The CGSM is a non-intrusive method that requires only one finite element...
Article
A new two-node, 3 DOF per node beam element based on the unified and integrated (UI) approach of first-order shear deformation theory (FSDT) is developed for axial-bending-shear functionally graded material (FGM) beams. In this approach, to bridge the Timoshenko and Bernoulli beam theory smoothly, the total displacement v is split into bending disp...
Technical Report
Full-text available
The goal of this project is to analyse the mobility in the surrounding of the University of Indonesia in Depok and to analyse an innovative and efficient transport system to provide a pertinent offer to satisfy this mobility demand in relation with the other modes, which can be linked with the analysed system of transport. The project we are propos...
Article
In this paper, we propose an efficient 3-node shell element with 6 DOFs per node based on Naghdi-Reissner-Mindlin theory. This new composite shell element, further denoted as DKMT18, takes into account shear deformation and coupled bending-membrane energy. DKMT18 element passes membrane, bending, and shear patch tests with no spurious mode. It also...
Article
In this paper, a higher-order element based on the unified and integrated approach of Timoshenko beam theory is developed. A two-node beam element with Hermitian functions of a 5th-degree polynomial (4 DOFs per node) called UI element is proposed to solve the problems of static and free vibration. In this proposed element, the Timoshenko beam theor...
Article
The paper deals with plate bending triangular elements with shear effect included, having only three degrees of freedom at each corner node. In that category, we select four elements due to their appreciation in the academic world and performances for practical applications using industrial software. Those four elements are T3γs (1982) (equivalent...
Article
Full-text available
A novel cell-based smoothed finite element method is proposed for thin and thick plates based on Reissner-Mindlin plate theory and assumed shear strain fields. The domain is discretized with arbitrary polygons and on each side of the polygonal element, discrete shear constraints are considered to relate the kinematical and the independent shear str...
Article
This paper will compare T3γs and MITC3 elements, both these two elements are three-node triangular plate bending elements with three degrees of freedom per node. The formulation of the T3γs and MITC3 elements is rather simple and has already been widely used. This paper will prove that the shear strain formulation of these two elements is identical...
Article
Full-text available
This paper presents an evaluation of thin bending plate problems using IGA Galerkin. It focuses on square plates under uniform load with different boundary conditions so that B-Spline is sufficient to generate basis functions. To demonstrate the performance of IGA Galerkin formulation, two numerical tests are presented.
Article
Full-text available
This paper discusses the evaluation of rectangular thin plate problem with uniform load using Isogeometric analysis (IGA) collocation method. The implementation details of the proposed method for problems with different boundary conditions are shown. The numerical results confirm that the proposed method represents an efficient formulation and show...
Article
This paper presents in a unified and comparative manner, the formulation of two triangular plate bending composite elements, i.e. DKMT and MITC3 which are published in 1993 and 2004. Both elements have 3 nodes and 5 dof per node (three displacements and two rotations), taking into account transverse shear effects. There are valid for thin to thick...
Article
This paper presents a review of the formulation of four plate bending quadrilateral elements and new advanced validation test results. The four elements are DKQ, MITC4, DSQ and DKMQ published between 1982 and 1993. The first is valid for thin plates and the three others include transverse shear effects. All elements have 4 nodes and 3 dof per node...
Article
In this work we propose a new 4-node DKMQ24 shell element based on Naghdi-Reissner-Mindlin shell theory with 24 degrees of freedom. This new composite shell element, which is developed from DKMQ plate and shell elements, takes into account shear deformation, coupled bending-membrane energy and warping effects. This element has no spurious mode, pas...
Article
Full-text available
This paper will study and compare two different three-node triangular bending plate elements with three degree of freedom per node, i.e. MITC3 and DKMT. Both elements, which were developed based on Reissner-Mindlin plate theory and independent shear strain field, have simple formulation and have already been used widely. In this paper, numerical te...
Article
Full-text available
This paper presents an application of the DKMQ24 element for error estimation using error estimator Z² and various recovery methods such as Averaging (AVR), Projection (PROJ) and Superconvergent Patch Recovery (SPR). The stresses found by using these recovery methods were compared to the reference solution. It was found that the AVR and SPR methods...
Article
This paper presents the development of Isogeometric Analysis for plate bending problems based on unified and integrated (UI) approach, which is a modification of Reissner-Mindlin plate theory for solving thick to thin plate problems. In Reissner-Mindlin, the total displacement and two rotations are independent of each other, while in this UI approa...
Article
This paper presents a new unified and integrated approach to construct locking-free finite elements for bending of shear deformable beam element. The new UI (Unified and Integrated) element, with two nodes and three degrees of freedom (d.o.f.) per node, is formulated based on a pure displacement formulation and utilises vertical displacement, rotat...
Article
In this paper we develop element DKMQ five Degrees of Freedom (DOF) per nodal with curvilinear approach. The advantage of this element that it is not required fictitious rigidity and can be used to analyze thick and thin structural problem without shear locking. As numerical result, DKMQ five DOF are able to give good performance.
Article
Full-text available
In this paper the discrete-Kirchhoff Mindlin quadrilateral (DKMQ) element was developed for buckling analysis of plate bending including the shear deformation. In this development the potential energy corresponding to membrane stresses was incorporated in the Hu-Washizu functional. The bilinear approximations for the deflection and normal rotations...
Article
This article presents the application of DKMQ24 shell element for twist of thin-walled beams. This element passed the patch tests for membrane, bending and shear problems and gave fine results for plate and shell problems analysis without shear locking. Thin-walled cantilever beams are analyzed using this element. DKMQ24 gives good results for cant...
Article
Full-text available
This paper presents an application of the Discrete Kirchhoff-Mindlin Triangular (DKMT) element for error estimation in composite structures. The DKMT element passed the patch tests and gave good results in many plate bending applications. The DKMT element formulation in composite application uses the same technique as the Discrete Kirchhoff-Mindlin...
Article
This paper presents a new simple four-node quadrilateral shell element with 24-dof which can be used to analyze thick and thin shell problems. This element which is developed from DKMQ plate element using the Naghdi/Mindlin/Reissner shell theory can take into account warping effects and coupling bending-membrane energy. This element, called DKMQ24,...
Article
This paper presents an application of DKMQ plate bending element to analyze composite structures. DKMQ element is an element proposed by Katili that passed the patch test and gives good results in many plate bending applications. It can be used to analyze thick and thin plate problem without shear locking. The application of DKMQ plate bending elem...
Article
The coconut fiber presents higher ductile properties than other natural fibers. In previous studies, it demonstrated than Indonesian coconut fibers presents an improved tensile strength and failure strain after washed with water and dried. The coconut fibers have the potential to reinforce material for construction, especially in earthquake areas s...
Article
Aircraft noise and pollutant emissions are an important part of the sources of pollution around airport that directly or indirectly will affect harmful to human health and ecosystems. The effects of aircraft noise and emissions on the populations around airport are deal with annoying and sometimes dangerous. In order to address this issue, the rese...
Article
In this paper, we present the study of an asymptotic linear one-dimensional model for thin-walled beams with open strongly curved cross-section, which is different from the classical Vlassov model. After recalling the main steps of the asymptotic procedure leading to the equilibrium equations of the thin-walled beam model, an analytical resolution...
Article
Full-text available
Aircraft pollutant emissions are an important part of sources of pollution that directly or indirectly affect human health and ecosystems. This research suggests an Artificial Neural Network model to determine the healthy risk level around Soekarno Hatta International Airport-Cengkareng Indonesia. This ANN modeling is a flexible method, which enabl...
Article
Full-text available
Recovery by Equilibrium in Patches (REP) is a recovery method introduced by B. Boroomand. This method is using patch as recovery media as is used by Superconvergent Patch Recovery (SPR) which is well known as a good recovery method. In this research, a numerical study of REP implementation is held to estimate error in finite element analysis using...
Article
This is the second part of a two-part paper on plate bending elements with shear effects included. This paper presents a new four-node, 12-d.o.f. quadrilateral plate bending element valid for the analysis of thick to thin plates. The element called DKMQ, has a proper rank (contains no spurious zero-energy modes), passes the patch test for thin and...
Article
A new three-node nine-degree-of-freedom triangular plate bending element is proposed which is valid for the analysis of both thick and thin plates. The element, called the discrete Kirchhoff-Mindlin triangle (DKMT), has a proper rank, passes the patch test for thin and thick plates in an arbitrary mesh, and is free of shear locking. As an extension...
Article
In this paper the formulation of a new triangular element based on the Reissner/Mindlin plate theory is presented. The element has three nodes and three d.o.f. per node only. It is based on constant bending modes plus incompatible energy orthogonal higher order bending modes. The transverse shear effects are represented using the moment equilibrium...

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