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Zak Abdallah

University of the West of England United Kingdom

Dr. Zak Abdallah is currently a senior lecturer in sustainability at the University of the West of England (UWE), with a focus on advanced materials and hydrogen technology. He is the principal investigator (PI) of an ongoing EPSRC project on digital investment casting of metallic structures, collaborating with the Advanced Manufacturing Research Centre (AMRC) and the University of Sheffield, UK. At UWE, Dr. Abdallah is also developing expertise in additive manufacturing of polymeric, composite, and metallic structures, supporting a research group comprising students and researchers. He is an associate at the Centre for Print Research (CFPR), where he supervises multiple research projects related to additive manufacturing. The CFPR at UWE is known for its excellence in additive manufacturing, utilizing advanced robotic-driven approaches. Before joining UWE, Dr. Abdallah was the principal and lead academic of fracture and fatigue at the Steel and Metals Institute (SaMI) at Swansea University. In this role, he was involved in tribology, surface engineering, metal joining, and hydrogen-induced corrosion. Dr. Abdallah has also worked at the Rolls-Royce University Technology Centre (UTC) at Swansea University on materials-related projects for gas turbine applications, including nickel, titanium, and steel alloys. Additionally, he has served as a materials consultant at Swansea Materials Research and Testing (SMaRT), working on various industrial projects for companies such as Airbus, McLaren, Rolls-Royce, and others.

2books edited

2chapters authored

Latest work with IntechOpen by Zak Abdallah

This book, Hydrogen Technologies - Recent Advances, New Perspectives, and Applications, explores the various aspects of hydrogen technology, including generation, transportation, and storage. The book compiles research conducted by experts from around the world, contributing to the body of knowledge in hydrogen technology for future applications. Edited by Dr. Zak Abdallah and Dr. Nada Aldoumani, both of whom are well-published in peer-reviewed journals, conferences, and scientific books, the book introduces key technologies and addresses various challenges and potential solutions. Over the years, numerous models have been developed to predict the performance of materials in hydrogen-induced environments. While some models have proven accurate, others have failed to predict process performance. The reliability of any predictive tool hinges on the use of parameters that meaningfully replicate real-life conditions. This principle is demonstrated throughout the book with research findings derived from experimental work in the field.

Hydrogen Technologies

Hydrogen Technologies

Edited by Zak Abdallah

Books edited

Advances in Fatigue and Fracture Testing and Modelling

Advances in Fatigue and Fracture Testing and Modelling

Edited by Zak Abdallah

Casting Processes and Modelling of Metallic Materials

Casting Processes and Modelling of Metallic Materials

Edited by Zak Abdallah

Chapters authored

Creep Lifing Models and Techniques

By Zakaria Abdallah, Karen Perkins and Cris Arnold

The deformation of structural alloys presents problems for power plants and aerospace applications due to the demand for elevated temperatures for higher efficiencies and reductions in greenhouse gas emissions. The materials used in such applications experience harsh environments which may lead to deformation and failure of critical components. To avoid such catastrophic failures and also increase efficiency, future designs must utilise novel/improved alloy systems with enhanced temperature capability. In recognising this issue, a detailed understanding of creep is essential for the success of these designs by ensuring components that do not experience excessive deformation which may ultimately lead to failure. To achieve this, a variety of parametric methods have been developed to quantify creep and creep fracture in high temperature applications. This study reviews a number of well-known traditionally employed creep lifing methods with some more recent approaches also included. The first section of this paper focuses on predicting the long-term creep-rupture properties which is an area of interest for the power generation sector. The second section looks at pre-defined strains and the re-production of full creep curves based on available data which is pertinent to the aerospace industry where components are replaced before failure.

Part of the book: Creep

Creep Failure of 25Cr-35Ni Centrifugally Cast Reformer Tube

By Kanhirodan Ravindranath, Abdulmuhsen Akbar, Bader Al-Wakaa and Zak Abdallah

Cast 25Cr-35Ni alloys are extensively being used in the petrochemical and petroleum refining industries for high-temperature applications. A typical application of such alloys in the industry is in the manufacture of cast catalyst reformer tubes for the production of hydrogen. The cast 25Cr-35Ni catalyst reformer tubes possess the required mechanical properties, creep resistance, oxidation resistance, and high-temperature stability. Though reformer tubes are designed to give a service life of over 100,000 hours at temperatures beyond 900°C, there are incidents of failure due to creep damage, which is the predominant failure mechanism in reformer tubes. The paper discusses an investigation conducted on the premature failure of a 25Cr-35Ni reformer tube. The investigation involved microstructural assessments and the evaluation of mechanical properties. The microstructure and mechanical properties of the service-exposed reformer tube were also compared with a new tube. The investigation revealed that the failure of the tube was due to creep embrittlement. The creep embrittlement was due to the microstructural degradations that occurred as a result of overheating. Adherence to the design and operational parameters is critical in mitigating creep embrittlement failures.

Part of the book: Failure Analysis

Related collaborators

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Royal Institute of Technology , Sweden

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Czestochowa University of Technology

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Mieczyslaw Rękas

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Joanna Jasak

Krystyna Schneider

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