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Dr Zahur Ullah's Outputs (61)

Multi-scale finite element based durability and reliability analysis of laminated fibre reinforced composites for civil engineering applications (2016)
Presentation / Conference Contribution
Zhou, X.-Y., Gosling, P. D., Ullah, Z., Pearce, C. J., & Kaczmarczyk, Ł. (2016, May). Multi-scale finite element based durability and reliability analysis of laminated fibre reinforced composites for civil engineering applications. Presented at The International Association for Bridge and Structural Engineering (IABSE) Conference: Bridges and Structures Sustainability-Seeking Intelligent Solutions, Guangzhou, China

Nonlinear micro-mechanical response of the fibre-reinforced polymer composites including matrix damage and fibre-matrix decohesion (2016)
Presentation / Conference Contribution
Ullah, Z., Kaczmarczyk, L., & Pearce, C. J. (2016, March). Nonlinear micro-mechanical response of the fibre-reinforced polymer composites including matrix damage and fibre-matrix decohesion. Presented at 24th UK Conference of the Association for Computational Mechanics in Engineering (ACME), University of Cardiff, Cardiff, UK

Prism solid-shell with heterogonous and hierarchical approximation basis (2016)
Presentation / Conference Contribution
Kaczmarczyk, L., Ullah, Z., & Pearce, C. J. (2016, March). Prism solid-shell with heterogonous and hierarchical approximation basis. Presented at 24th UK Conference of the Association for Computational Mechanics in Engineering (ACME), University of Cardiff, Cardiff, UK

Three-dimensional nonlinear micro/meso-mechanical response of the fibre-reinforced polymer composites (2016)
Journal Article
Ullah, Z., Kaczmarczyk, L., & Pearce, C. J. (2017). Three-dimensional nonlinear micro/meso-mechanical response of the fibre-reinforced polymer composites. Composite Structures, 161, 204-214. https://doi.org/10.1016/j.compstruct.2016.11.059

A three-dimensional multi-scale computational homogenisation framework is developed for the prediction of nonlinear micro/meso-mechanical response of the fibre-reinforced polymer (FRP) composites. Two dominant damage mechanisms, i.e. matrix elasto-pl... Read More about Three-dimensional nonlinear micro/meso-mechanical response of the fibre-reinforced polymer composites.

Multi-scale computational homogenisation to predict the long-term durability of composite structures (2016)
Journal Article
Ullah, Z., Kaczmarczyk, Ł., Grammatikos, S., Evernden, M., & Pearce, C. (2017). Multi-scale computational homogenisation to predict the long-term durability of composite structures. Computers and Structures, 181, 21-31. https://doi.org/10.1016/j.compstruc.2016.11.002

A coupled hygro-thermo-mechanical computational model is proposed for fibre reinforced polymers, formulated within the framework of Computational Homogenisation (CH). At each macrostructure Gauss point, constitutive matrices for thermal, moisture tra... Read More about Multi-scale computational homogenisation to predict the long-term durability of composite structures.

Exploiting the benefits of multi-scale analysis in reliability analysis for composite structures (2016)
Journal Article
Zhou, X.-Y., Gosling, P. D., Ullah, Z., Kaczmarczyk, Ł., & Pearce, C. J. (2016). Exploiting the benefits of multi-scale analysis in reliability analysis for composite structures. Composite Structures, 155, 197-212. https://doi.org/10.1016/j.compstruct.2016.08.015

This paper investigates two critical issues, namely propagation of multi-scale uncertainty, and selection of failure criteria, related to reliability analysis of composites by using multi-scale methods. Due to the multi-scale architecture of composit... Read More about Exploiting the benefits of multi-scale analysis in reliability analysis for composite structures.

Parallel computations in nonlinear solid mechanics using adaptive finite element and meshless methods (2016)
Journal Article
Ullah, Z., Coombs, W. M., & Augarde, C. E. (2016). Parallel computations in nonlinear solid mechanics using adaptive finite element and meshless methods. Engineering Computations, 33(4), 1161-1191. https://doi.org/10.1108/EC-06-2015-0166

Purpose A variety of meshless methods have been developed in the last twenty years with an intention to solve practical engineering problems, but are limited to small academic problems due to associated high computational cost as compared to the stan... Read More about Parallel computations in nonlinear solid mechanics using adaptive finite element and meshless methods.

Perturbation-based stochastic multi-scale computational homogenization method for the determination of the effective properties of composite materials with random properties (2015)
Journal Article
Zhou, X.-Y., Gosling, P., Pearce, C., Kaczmarczyk, L., & Ullah, Z. (2016). Perturbation-based stochastic multi-scale computational homogenization method for the determination of the effective properties of composite materials with random properties. Computer Methods in Applied Mechanics and Engineering, 300, 84-105. https://doi.org/10.1016/j.cma.2015.10.020

Quantifying uncertainty in the overall elastic properties of composite materials arising from randomness in the material properties and geometry of composites at microscopic level is crucial in the stochastic analysis of composites. In this paper, a... Read More about Perturbation-based stochastic multi-scale computational homogenization method for the determination of the effective properties of composite materials with random properties.

Perturbation-based stochastic multi-scale computational homogenization method for woven textile composites (2015)
Journal Article
Zhou, X.-Y., Gosling, P. D., Pearce, C. J., Ullah, Z., & Kaczmarczyk, L. (2016). Perturbation-based stochastic multi-scale computational homogenization method for woven textile composites. International Journal of Solids and Structures, 80, 368-380. https://doi.org/10.1016/j.ijsolstr.2015.09.008

In this paper, a stochastic homogenization method that couples the state-of-the-art computational multi-scale homogenization method with the stochastic finite element method, is proposed to predict the statistics of the effective elastic properties o... Read More about Perturbation-based stochastic multi-scale computational homogenization method for woven textile composites.

Multiscale modelling of the textile composite materials (2014)
Presentation / Conference Contribution
Ullah, Z., Kaczmarczyk, Ł., Cortis, M., Pearce, C., Javadi, A., & Hussain, M. S. (2014, April). Multiscale modelling of the textile composite materials. Presented at 22nd ACME Conference on Computational Mechanics, Exeter, United Kingdom

This paper presents an initial computational multiscale modelling of the fibre-reinforced composite materials. This study will constitute an initial building block of the computational framework, developed for the DURCOMP (providing confidence in dur... Read More about Multiscale modelling of the textile composite materials.

An adaptive finite element/meshless coupled method based on local maximum entropy shape functions for linear and nonlinear problems (2013)
Journal Article
Ullah, Z., Coombs, W. M., & Augarde, C. E. (2013). An adaptive finite element/meshless coupled method based on local maximum entropy shape functions for linear and nonlinear problems. Computer Methods in Applied Mechanics and Engineering, 267, 111-132. https://doi.org/10.1016/j.cma.2013.07.018

In this paper, an automatic adaptive coupling procedure is proposed for the finite element method (FEM) and the element-free Galerkin method (EFGM) for linear elasticity and for problems with both material and geometrical nonlinearities. In this new... Read More about An adaptive finite element/meshless coupled method based on local maximum entropy shape functions for linear and nonlinear problems.

Local maximum entropy shape functions based FE-EFGM coupling (2013)
Report
Ullah, Z., Augarde, C. E., & Coombs, W. M. (2013). Local maximum entropy shape functions based FE-EFGM coupling. [No known commissioning body]

In this paper, a new method for coupling the finite element method (FEM) and the element-free Galerkin method (EFGM) is proposed for linear elastic and geometrically nonlinear problems using local maximum entropy shape functions in the EFG zone of th... Read More about Local maximum entropy shape functions based FE-EFGM coupling.

Finite deformation elasto-plastic modelling using an adaptive meshless method (2012)
Journal Article
Ullah, Z., & Augarde, C. (2013). Finite deformation elasto-plastic modelling using an adaptive meshless method. Computers and Structures, 118, 39-52. https://doi.org/10.1016/j.compstruc.2012.04.001

Efficient computational modelling of problems including both material and geometric nonlinearities remains challenging. Often these problems are modelled with adaptive finite element method (FEM). Meshless methods offer the attractive possibility of... Read More about Finite deformation elasto-plastic modelling using an adaptive meshless method.