Dr Zahur Ullah's Outputs (61)

Comparative analysis of out-of-plane performance in 3D-printed graded lattice structures (2025)
Journal Article
Sari, E., Ullah, Z., Kazancı, Z., & Sun, D. (in press). Comparative analysis of out-of-plane performance in 3D-printed graded lattice structures. Smart Materials and Structures, 34, Article 065028. https://doi.org/10.1088/1361-665x/ade413

Graded lattice structures have garnered significant attention for their ability to combine lightweight properties with superior mechanical performance. Their tailored structures/properties under in-plane loading make them ideal for impact resistance... Read More about Comparative analysis of out-of-plane performance in 3D-printed graded lattice structures.

Predicting free edge delamination induced by thermal loading using finite fracture mechanics (2025)
Journal Article
Burhan, M., Ullah, Z., Kazancı, Z., & Catalanotti, G. (2025). Predicting free edge delamination induced by thermal loading using finite fracture mechanics. International Journal of Fracture, 250(1), 1-19. https://doi.org/10.1007/s10704-024-00817-z

The material mismatch between the dissimilarly oriented plies within laminated structures induces localised singular interlaminar stresses at free edges, under various loading conditions such as mechanical, moisture, or thermal. These interlaminar st... Read More about Predicting free edge delamination induced by thermal loading using finite fracture mechanics.

Finite fracture mechanics fracture criterion for free edge delamination (2024)
Presentation / Conference Contribution
Burhan, M., Scalici, T., Ullah, Z., Kazancı, Z., & Catalonotti, G. (2024, July). Finite fracture mechanics fracture criterion for free edge delamination. Presented at 21st European Conference on Composite Materials (ECCM21), Nantes, France

Effects of ply hybridisation on delamination in hybrid laminates at CorTen steel/M79LT-UD600 composite interfaces (2024)
Presentation / Conference Contribution
Burhan, M., Sands, C., McCreight, T., & Ullah, Z. (2024, April). Effects of ply hybridisation on delamination in hybrid laminates at CorTen steel/M79LT-UD600 composite interfaces. Presented at UK Association for Computational Mechanics Conference, Durham University, UK

Overlapping improved element-free Galerkin and finite element methods for the solution of non-linear transient heat conduction problems with concentrated moving heat sources (2024)
Presentation / Conference Contribution
Alvarez-Hostos, J. C., & Ullah, Z. (2024, April). Overlapping improved element-free Galerkin and finite element methods for the solution of non-linear transient heat conduction problems with concentrated moving heat sources. Presented at UK Association for Computational Mechanics Conference (UKACM2024), Durham, UK

A finite fracture mechanics approach to assess the fatigue life of laminates exhibiting free edge effects (2024)
Journal Article
Burhan, M., Ullah, Z., Kazancı, Z., & Catalanotti, G. (2025). A finite fracture mechanics approach to assess the fatigue life of laminates exhibiting free edge effects. Composite Structures, 354, Article 118797. https://doi.org/10.1016/j.compstruct.2024.118797

This study presents the application of a 3D Finite Fracture Mechanics (FFM) criterion for predicting fatigue life estimation of laminates exhibiting free edge effects. The proposed 3D FFM fatigue criterion incorporates interface properties such as th... Read More about A finite fracture mechanics approach to assess the fatigue life of laminates exhibiting free edge effects.

Experimental and numerical investigation of fracture characteristics in hybrid steel/composite and monolithic angle-ply laminates (2024)
Journal Article
Burhan, M., & Ullah, Z. (online). Experimental and numerical investigation of fracture characteristics in hybrid steel/composite and monolithic angle-ply laminates. Journal of Composite Materials, https://doi.org/10.1177/00219983241305620

This study investigated the fracture characteristics of hybrid laminates consisting of CorTen steel and carbon fibre-reinforced polymer composites under quasi-static loading, both experimentally and numerically. The hybrid laminates are classified in... Read More about Experimental and numerical investigation of fracture characteristics in hybrid steel/composite and monolithic angle-ply laminates.

Extending the Modified Transverse Crack Tensile test for Mode II Fracture Toughness Characterisation of Hybrid Interfaces (2024)
Journal Article
Scalici, T., Dalli, D., Ullah, Z., & Catalanotti, G. (2025). Extending the Modified Transverse Crack Tensile test for Mode II Fracture Toughness Characterisation of Hybrid Interfaces. Composites Part B: Engineering, 291, Article 112063. https://doi.org/10.1016/j.compositesb.2024.112063

Measuring mode II fracture toughness at a dissimilar interface using the Transverse Crack Tensile may be challenging, particularly if geometric and elastic symmetry conditions are not maintained during crack propagation. Building on previous results,... Read More about Extending the Modified Transverse Crack Tensile test for Mode II Fracture Toughness Characterisation of Hybrid Interfaces.

A critical review on free edge delamination fracture criteria (2024)
Journal Article
Burhan, M., Ullah, Z., Kazancı, Z., & Catalanotti, G. (2024). A critical review on free edge delamination fracture criteria. Mechanics of Advanced Materials and Structures, 31(30), 13542-13555. https://doi.org/10.1080/15376494.2024.2424492

Laminates experience three-dimensional singular stress near their free edges due to elastic mismatches between layers, which can cause delamination. This paper critically evaluates methods for predicting free edge delamination and highlights the limi... Read More about A critical review on free edge delamination fracture criteria.

Stress-based topology optimization using maximum entropy basis functions-based meshless method (2024)
Journal Article
Khan, I., Ullah, Z., Ullah, B., Siraj-ul-Islam, & Khan, W. (online). Stress-based topology optimization using maximum entropy basis functions-based meshless method. Engineering with Computers, https://doi.org/10.1007/s00366-024-02047-2

This paper presents volume-constrained stress minimization-based, topology optimization. The maximum entropy (maxent) basis functions-based meshless method for two-dimensional linear elastic structures is explored. This work focuses to test the effec... Read More about Stress-based topology optimization using maximum entropy basis functions-based meshless method.

Investigating factors influencing interlaminar stresses and energy release rates of semi-elliptical cracks at free edges (2024)
Journal Article
Burhan, M., Scalici, T., Ullah, Z., Kazancı, Z., & Catalanotti, G. (2024). Investigating factors influencing interlaminar stresses and energy release rates of semi-elliptical cracks at free edges. Engineering Fracture Mechanics, 307, Article 110274. https://doi.org/10.1016/j.engfracmech.2024.110274

Traditional approaches that rely on stress or energy-based criteria to predict delamination require the determination of stresses before crack onset or energy release rates after crack initiation, respectively. While a relatively new coupled criterio... Read More about Investigating factors influencing interlaminar stresses and energy release rates of semi-elliptical cracks at free edges.

A three-dimensional Finite Fracture Mechanics model to predict free edge delamination in angle-ply laminates (2024)
Journal Article
Burhan, M., Scalici, T., Ullah, Z., Kazancı, Z., & Catalanotti, G. (2024). A three-dimensional Finite Fracture Mechanics model to predict free edge delamination in angle-ply laminates. Engineering Fracture Mechanics, 306, Article 110156. https://doi.org/10.1016/j.engfracmech.2024.110156

Three-dimensional semi-analytical investigation of interlaminar stresses in composite laminates (2023)
Presentation / Conference Contribution
Burhan, M., Scalici, T., Ullah, Z., Kazancı, Z., Falzon, B., & Catalanotti, G. (2023, April). Three-dimensional semi-analytical investigation of interlaminar stresses in composite laminates. Presented at UK Association for Computational Mechanics Conference (UKACM2023), The University of Warwick, Coventry, UK

Modelling And Assessing Impact Damage For A New Generation Of Zero-Emissions Composite Maritime Vessels (2023)
Presentation / Conference Contribution
Millen, S. L. J., McAleavy, E., Ullah, Z., & Falzon, B. G. (2023, July). Modelling And Assessing Impact Damage For A New Generation Of Zero-Emissions Composite Maritime Vessels. Presented at Twenty-Third International Conference On Composite Materials (ICCM23), Belfast, UK

A Semi-Analytical Method For Measuring The Strain Energy Release Rates Of Elliptical Cracks (2023)
Presentation / Conference Contribution
Burhan, M., Scalici, T., Ullah, Z., Kazancı, Z., Falzon, B., & Catalanotti, G. (2023, July). A Semi-Analytical Method For Measuring The Strain Energy Release Rates Of Elliptical Cracks. Presented at Twenty-Third International Conference On Composite Materials (ICCM23), Belfast, UK

Tsai's Modulus And Double-Double Laminates In The Design Of Advanced Composite Structures (2023)
Presentation / Conference Contribution
Millen, S. L. J., Aravand, M. A., Ullah, Z., & Falzon, B. G. (2023, July). Tsai's Modulus And Double-Double Laminates In The Design Of Advanced Composite Structures. Presented at Twenty-Third International Conference On Composite Materials (ICCM23), Belfast, UK

An adaptive B-spline representation of topology optimization design for Additive Manufacturing (2023)
Journal Article
Khan, I., Ullah, B., Siraj-ul-Islam, Ullah, Z., & Khan, W. (2023). An adaptive B-spline representation of topology optimization design for Additive Manufacturing. Advances in Engineering Software, 186, Article 103552. https://doi.org/10.1016/j.advengsoft.2023.103552

Topology optimization is a renowned structural optimization approach used to compute the optimal topology for the enhancement of structural performance. It has been in common practice in different engineering fields such as automobile and aerospace.... Read More about An adaptive B-spline representation of topology optimization design for Additive Manufacturing.

An overset improved element-free Galerkin-finite element method for the solution of transient heat conduction problems with concentrated moving heat sources (2023)
Journal Article
Álvarez-Hostos, J. C., Ullah, Z., Storti, B. A., Tourn, B. A., & Zambrano-Carrillo, J. A. (2024). An overset improved element-free Galerkin-finite element method for the solution of transient heat conduction problems with concentrated moving heat sources. Computer Methods in Applied Mechanics and Engineering, 418(Part B), Article 116574. https://doi.org/10.1016/j.cma.2023.116574

A novel Overset Improved Element-Free Galerkin-Finite Element Method (Ov-IEFG-FEM) for solving transient heat conduction problems with concentrated moving heat sources is introduced in this communication. The method is a mesh-less/mesh-based chimera-... Read More about An overset improved element-free Galerkin-finite element method for the solution of transient heat conduction problems with concentrated moving heat sources.

Modelling low-velocity impact damage and compression after impact of 3D woven structures considering compaction (2023)
Journal Article
Millen, S., Dahale, M., Fisher, T., Samy, A., Thompson, K., Ramaswamy, K., Ralph, C., Archer, E., McIlhagger, A., Ullah, Z., & Falzon, B. (2023). Modelling low-velocity impact damage and compression after impact of 3D woven structures considering compaction. Composite Structures, 318, Article 117104. https://doi.org/10.1016/j.compstruct.2023.117104

A novel finite element modelling approach is presented which incorporates representative binder yarn compaction, for simulating the low-velocity impact (LVI) and compression after impact (CAI) response of 3D woven layer-to-layer carbon/epoxy composit... Read More about Modelling low-velocity impact damage and compression after impact of 3D woven structures considering compaction.

Studies on the impact and compression-after-impact response of ‘Double-Double’carbon-fibre reinforced composite laminates (2023)
Book Chapter
Millen, S. L. J., Aravand, M. A., Ullah, Z., & Falzon, B. (2023). Studies on the impact and compression-after-impact response of ‘Double-Double’carbon-fibre reinforced composite laminates. In S. W. Tsai, B. G. Falzon, & A. Aravand (Eds.), Double-double: simplifying the design and manufacture of composite laminates (161-180). (2nd ed.). Stanford University Press

This chapter presents comparative high fidelity computational finite element (FE) modelling of low-velocity impact (LVI) damage and compression-after-impact (CAI) strength of both ‘Legacy Quad Laminates’ (LQL) and ‘Double-Double’ DD laminates, using... Read More about Studies on the impact and compression-after-impact response of ‘Double-Double’carbon-fibre reinforced composite laminates.