Pages
- 1
- 2
- document
-
Elalfy, M.H.I. (author), Abdalla, Mostafa M. (author), Abuelfoutouh, Nader (author)Traditional failure criteria for composites are usually formulated in material coordinates and depend on all three inplane stresses, hence failure evaluation depends on the ply angle. The omnistrain failure envelope describes the most critical failure envelope in strain space irrespective of ply orientation. This independence of ply...journal article 2023
- document
-
Abdalla, S. (author), Kolachina, A. (author), Adusumilli, S. (author), Bhowmick, A (author), Alou-Font, E. (author), Amarouche, L. (author), Andersen, OB (author), Naeije, M.C. (author), Simons, W.J.F. (author)In 2018 we celebrated 25 years of development of radar altimetry, and the progress achieved by this methodology in the fields of global and coastal oceanography, hydrology, geodesy and cryospheric sciences. Many symbolic major events have celebrated these developments, e.g., in Venice, Italy, the 15th (2006) and 20th (2012) years of progress and...journal article 2021
- document
-
Sinha, Kautuk (author), Singh, Niels K. (author), Abdalla, Mostafa M. (author), De Breuker, R. (author), Alijani, F. (author)The article proposes a method developed for model order reduction in a Finite Element (FE) framework that is capable of computing higher order stiffness tensors. In the method, a truncated third order asymptotic expansion is used for transformation of an FE model to a reduced system. The basis matrix in the formulation of the reduced-order...journal article 2020
- document
-
Dillinger, J.K.S. (author), Abdalla, M.M. (author), Meddaikar, M.Y. (author), Klimmek, Thomas (author)This paper presents an aero load correction strategy applicable to the static aeroelastic optimization of composite wings. The optimization framework consists of a successive convex subproblem iteration procedure, in which a gradient-based optimizer consecutively solves a local approximation problem. Responses are approximated as a linear and...journal article 2019
- document
-
Peeters, D.M.J. (author), Lozano, Gustavo Gonzalez (author), Abdalla, M.M. (author)A method to optimise the fibre angle distribution of variable stiffness laminates is proposed. The proposed method integrates a fibre angle retrieval step with a fibre angle optimisation procedure. A multi-level approximation approach is used in combination with the method of successive approximations. First, fibre angle retrieval is done by...journal article 2018
- document
-
Peeters, D.M.J. (author), Hong, Z. (author), Abdalla, M.M. (author)A way to approximate the compliance of composites for optimisation is described. A two-level approximation scheme is proposed inspired by traditional approximation concepts such as force approximations and convex linearisation. In level one, an approximation in terms of the reciprocal in-plane stiffness matrix is made. In level two, either...journal article 2018
- document
-
Wang, Z. (author), Turteltaub, S.R. (author), Abdalla, M.M. (author)This work is concerned with the development of a framework to solve shape optimization problems for transient heat conduction problems within the context of isogeometric analysis (IGA). A general objective functional is used to accommodate both shape optimization and passive control problems under transient conditions. An adjoint sensitivity...journal article 2017
- document
- de Jong, Sijbren (author), Auping, Willem L. (author), Oosterveld, Willem (author), Usanov, Artur (author), Abdalla, Mercedes (author), Van de Bovenkamp, Alice (author), Frattina della Frattina, Christopher (author) report 2017
- document
-
Wang, Zhen Pei (author), Abdalla, M.M. (author), Turteltaub, S.R. (author)In isogeometric shape optimization, the use of the search direction directly predicted from the discrete shape gradient makes the optimization history strongly dependent on the discretization. This discretization-dependency can affect the convergence and may lead the optimization process into a sub-optimal solution. The source of this...journal article 2017
- document
- Peeters, D (author), Abdalla, M.M. (author) journal article 2016
- document
-
Peeters, D.M.J. (author), Irisarri, F.X. (author), Abdalla, M.M. (author)Modern composite structures o<br/>er two avenues of optimising performance. One, optimising a single stacking sequence over the structure leading to constant sti<br/>ness designs. Two, varying the sti<br/>ness over the structure. This may be achieved by dropping plies, changing the thickness, or by steering the fibres, changing the fibre angles....conference paper 2016
- document
-
Peeters, D.M.J. (author), Abdalla, M.M. (author)Nonconventional laminates, as defined in this paper, are laminates where ply angles are not restricted to a finite set: for example 0, 45, −45 −45 and 90 deg. Removing this restriction, structural behavior (for example, postimpact behavior) can be significantly improved. Nonconventional laminates are made of straight or steered fibers leading to...journal article 2016
- document
-
Hong, Z. (author), Abdalla, M.M. (author)Optimisation algorithms used to automatically size structural members commonly involve stress constraints to avoid material failure. Therefore the cost of optimisation grows rapidly as the number of structural members is increased due to the corresponding increase in the number of constraints. In this work, an efficient method for large scale...conference paper 2016
- document
- Peeters, D.M.J. (author), Abdalla, M.M. (author) conference paper 2016
- document
-
Peeters, D.M.J. (author), Abdalla, M.M. (author)A method to optimise the fibre angle distribution of variable stiffness laminates is proposed. The proposed method integrates a fibre angle retrieval step with a fibre angle optimisation procedure. A multi-level approximation approach is used in combination with the method of successive approximations. First, fibre angle retrieval is done by...conference paper 2015
- document
-
Jeliazkov, M. (author), Sardar Abadi, P.M. (author), Lopes, C.S. (author), Abdalla, M.M. (author), Peeters, D.M.J. (author)A computationally efficient two-level design methodology is developed for the optimization of stiffened compression loaded panels having variable stiffness panels as their skin. In the first step extensive bay panel optimization is performed using a Rayleigh-Ritz energy method coupled with a specialized Genetic Algorithm. Results in agreement...conference paper 2015
- document
-
Wang, D. (author), Abdalla, M.M. (author)Grid-stiffened composite structures, where the skin is stiffened by a lattice of stiffeners, not only allow for significant reduction in structural weight but are also competitive in terms of structural stability and damage tolerance compared with sandwich composite structures. As the development of Automated Fiber Placement (AFP) technology...conference paper 2015
- document
-
Sardar Abadi, P.M. (author), Jeliazkov, M. (author), Sebaey, T.A. (author), Lopes, C.S. (author), Abdalla, M.M. (author), Peeters, D.M.J. (author)This paper presents the design procedure of a quasi-isotropic (QI) laminate employing dispersion of ply orientations. The goal is to improve damage resistance of a laminate under low velocity impact (LVI). The LVI is treated as a quasi-static loading and instead of a plate a laminated beam is considered. Therefore, this situation simplifies the...conference paper 2015
- document
-
Werter, N.P.M. (author), De Breuker, R. (author), Abdalla, M.M. (author)Over the years, wings have become lighter and more flexible, making them more prone to aeroelastic effects. Thus, aeroelasticity in design becomes more important. In order to determine the response of an aircraft to, for example, a gust, an unsteady aerodynamic model is required to determine the dynamic loads. The three most-commonly used...conference paper 2015
- document
- De Rooij, R. (author), Abdalla, M. (author) conference paper 2015
Pages
- 1
- 2