Publications
55 results found
Wen PH, Dirgantara T, Aliabadi MH, et al., 2010, The Boundary Element Method for Geometrically Nonlinear Analyses of Plates and Shells, Boundary Element Methods in Engineering and Sciences, Editors: Aliabadi, Wen, Publisher: Imperial College Pr, ISBN: 9781848165793
Baiz PM, 2010, Drilling Rotations in BEM, 11th International Conference on Boundary Elements Techniques.
Baiz PM, Natarajan S, Kerfriden P, et al., 2010, Linear Buckling Analysis of Cracked Isotropic Plates using XFEM, UK National Conference on Computational Mechanics in Engineering.
Troyani NL, Gomes CJ, Baiz PM, 2010, Capability for Capturing Temperability as a Criterion for the Validity of Thermoviscoelastic Constitutive Equations, JOURNAL OF THERMAL STRESSES, Vol: 33, Pages: 37-54, ISSN: 0149-5739
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- Citations: 2
Baiz PM, Aliabadi MH, 2010, Post buckling analysis of shear deformable shallow shells by the boundary element method, Int. J. Numer. Meth. Engng, Vol: 84, Pages: 379-433
This paper presents four boundary element formulations for post buckling analysis of shear deformable shallow shells. The main differences between the formulations rely on the way non-linear terms are treated and on the number of degrees of freedom in the domain. Boundary integral equations are obtained by coupling boundary element formulation of shear deformable plate and two-dimensional plane stress elasticity. Four different sets of non-linear integral equations are presented. Some domain integrals are treated directly with domain discretization whereas others are dealt indirectly with the dual reciprocitymethod. Each set of non-linear boundary integral equations are solved using an incremental approach, where loads and prescribed boundary conditions are applied in small but finite increments. The resulting systems of equations are solved using a purely incremental technique and the Newton–Raphson technique with the Arc length method. Finally, the effect of imperfections (obtained from a linear buckling analysis) on the post-buckling behaviour of axially compressed shallow shells is investigated. Results of severalbenchmark examples are compared with the published work and good agreement is obtained.
Sharif Khodaei Z, Baiz PM, Aliabadi MH, 2009, Fatigue Crack Initiation and Propagation in Thick Multilayer Metallic Laminates, 8th International Conference on Fracture and Damage Mechanics
Baiz PM, Sharif Khodaei Z, Aliabadi MH, 2009, Fracture Mechanics Analysis of Multilayer Metallic Laminates by BEM, 10th International Conference on Boundary Elements Techniques
Troyani N, Perez A, Gomes C, et al., 2009, Selective finite element refinement in torsional problems based on the membrane analogy, FINITE ELEMENTS IN ANALYSIS AND DESIGN, Vol: 45, Pages: 547-554, ISSN: 0168-874X
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- Citations: 2
Baiz PM, Aliabadi MH, 2009, Buckling and Post-buckling Analysis of Thin Walled Structures by the Boundary Element Method, UK National Conference on Computational Mechanics in Engineering
Aliabadi MH, Baiz PM, Albuquerque EL, 2009, Stability Analysis of Plates, Recent Advances in Boundary Element Methods, Editors: Manolis, Polyzos, Publisher: Springer 2009, ISBN: 1402097093
Baiz PM, Aliabadi MH, 2009, Local buckling of thin-walled structures by the boundary element method, Engineering Analysis with Boundary Elements, Vol: 33, Pages: 302-313, ISSN: 0955-7997
In this work a multi-region boundary element formulation for linear local buckling analysis of assembled plate and shallow shell structures is presented. The assembly is divided into sub-regions. In each sub-region, the formulation is formed by coupling boundary element formulations of shear deformable plate bending and two-dimensional plane stress elasticity. Domain integrals appearing in the formulation (due to the curvature and due to the domain load) are transformed into equivalent boundary integrals. Membrane stresses at discrete domain points of each sub-region (plate or shallow shell) in the assembly are obtained from the prebuckling state, resulting in a set of linear buckling equations in terms of the buckling deflection and the buckling load factor. Buckling equation is presented as a standard eigenvalue problem. Results are compared with FEM solutions and it is shown that good accuracy can be achieved with the present multi-region BEM formulation.
Albuquerque EL, Baiz PM, Aliabadi MH, 2008, Stability Analysis of Composite Plates by the Boundary Element Method, 9th International Conference on Boundary Elements Techniques
Baiz PM, Aliabadi MH, 2008, DBEM for Fracture Analysis of Stiffened Curved Panels (Plates and Shallow Shells Assemblies), 9th International Conference on Boundary Elements Techniques
Aliabadi MH, Baiz PM, 2008, The Boundary Element Method for Buckling and Post-buckling Analysis of Plates and Shells, Buckling and Postbuckling Structures, Editors: Falzon, Aliabadi, England, Publisher: Imperial College Press, ISBN: 978-1860947940
Baiz PM, Aliabadi MH, 2008, Geometrically Nonlinear Analysis of Cracked Stiffened Curved Panels by DBEM, 7th International Conference on Fracture and Damage Mechanics, Publisher: TRANS TECH PUBLICATIONS LTD, Pages: 13-16, ISSN: 1013-9826
Baiz PM, Aliabadi MH, 2007, Postbuckling Analysis of Shear Deformable Shallow Shells by BEM, 8th International Conference on Boundary Elements Techniques
Baiz PM, Aliabadi MH, 2007, Numerical Studies on the Fatigue Crack Growth of Welded Stiffened Panels, 6th International Conference on Fracture and Damage Mechanics
Baiz PM, Aliabadi MH, 2007, Buckling analysis of shear deformable shallow shells by the boundary element method, Engineering Analysis with Boundary Elements, Vol: 31, Pages: 361-372, ISSN: 0955-7997
In this work a boundary element (BE) formulation for buckling problem of shear deformable shallow shells is presented. A set of five boundary integral equations are obtained by coupling two-dimensional plane stress elasticity with shear deformable plate bending (Reissner). The domain integrals appearing in the formulation (due to the curvature and due to the domain load) are transferred into equivalent boundary integrals. The BE formulation is presented as an eigenvalue problem, to provide direct evaluation of critical load factors and buckling modes. Several examples are presented. The BE results for a cylindrical shallow shell with different curvatures are compared with other numerical solutions and good agreements are obtained.
Baiz PM, Aliabadi MH, 2006, Local Buckling of Thin Walled Structures by BEM, 7th International Conference on Boundary Elements Techniques
Baiz PM, Aliabadi MH, 2006, Linear Buckling Analysis of Shear Deformable Shallow Shells by the Boundary Domain Element Method, Computer Modeling in Engineering and Sciences, Vol: 13, Pages: 19-34, ISSN: 1526-1506
In this paper the linear buckling problem of elastic shallow shells by a shear deformable shell theory is presented. The boundary domain integral equations are obtained by coupling two dimensional plane stress elasticity with boundary element formulation of Reissner plate bending. The buckling problem is formulated as a standard eigenvalue problem, in order to obtain directly critical loads and buckling modes as part of the solution. The boundary is discretised into quadratic isoparametric elements while in the domain quadratic quadrilateral cells are used. Several examples of cylindrical shallow shells (curved plates) with different dimensions and boundary conditions are analysed. The results are compared with finite element solutions, and very good agreement is obtained.
Baiz PM, Aliabadi MH, 2005, Buckling Analysis of Cracked Shallow Shells, 4th International Conference on Fracture and Damage Mechanics
Baiz PM, Aliabadi MH, 2005, Large Deflection Analysis of Shear Deformable Shallow Shells by the Field Boundary Element Method, 6th International Conference on Boundary Elements Techniques
Troyani N, Perez A, Baiz P, 2005, Effect of Finite Element Mesh Orientation on Solution Accuracy for Torsional Problems, Finite Elements in Analysis and Design, Vol: 41, Pages: 1377-1383, ISSN: 0168-874X
Finite element mesh orientation has been studied in terms of the effects it may have on solution accuracy in both solid and fluid mechanics. This work studies the effect of triangular finite element mesh orientation with regards to the torsion of non-circular machine elements and structural elements in terms of maximum shearing stress computation accuracy. The membrane deflection (a Poisson problem) analogy is used to guide the automatic mesh orientation by quadrilateral diagonal swapping, starting from an initially arbitrary mesh. Two sets of results for two specific orientations are reported: mesh orientation approximately perpendicular to the membrane contour lines and mesh orientation in a direction approximately parallel to the membrane contour lines. The torsion of a square cross section member was selected as a benchmark for the analysis since it possesses a known analytic series solution that readily allows the performing of accuracy estimates. This study demonstrates that mesh orientation may have important consequences on the accuracy of the solution for the type of stress estimates treated in this work. In a more general sense, it is concluded that mesh orientation may have important consequences on the accuracy of the solution in second order Poisson type problems as well.
Baiz PM, Aliabadi MH, 2004, Buckling Analysis of Shear Deformable Shallow Shells, 5th International Conference on Boundary Elements Techniques
Baiz P, Troyani N, 2002, Size dependency of the temperability of thermoviscoelastic materials, 6th International Conference on Numerical Methods in Engineering and Applied Sciences
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