Phone 0114 225 3407
Email S.Hasan@shu.ac.uk
B.Eng (Hons) Metallurgical Engineering, PhD
Research interests
The principal aims of my research activities are to understand;
- The physical processes occurring during fatigue and fracture of engineering materials and
- Modelling of interfacial strengthening mechanisms operating at micro-interface of second phase reinforced metallic alloys.
- Environmental damage modelling and life assessment of metallic foam material.
The first is my work on thermo-mechanical fatigue crack growth behaviour when subjected to thermal shock. The crack growth behaviour due to thermal loading is reasonably well understood but normal engineering practice for fatigue life estimation still depends on the empirical design rules. My work on thermo-mechanical fatigue is to develop a straightforward model to incorporate isothermal fatigue data to predict thermal shock response of the material. Recently concluded PhD programme studied the effect of bi-axiallity on thermal down shock fatigue crack growth. A new method of analysis based on plastic zone size ratio is being proposed to predict the crack growth behaviour when subjected to thermo-mechanical loading.
The fatigue and fracture analysis of advanced structural materials continues with our work on modelling impact damage in fibre reinforced composites and damage assessment with Non-destructive testing techniques, in particular ANDSCAN imaging system based upon ultrasonic principals. Accurate mapping of impact damage and developing fatigue life models to predict remaining life of composite structures is one of the objectives of our current research work.
The second example of our research theme is the study of interfacial strengthening behaviour of second phase reinforced metallic alloys. To study the matrix-reinforcement interface electron microscopy is used to investigate compositional variations and role of precipitates and segregation at interface boundaries. Grain boundaries energy criteria is being used to model the interfacial strength of the two phase system and compared with thermo-mechanically treated deformation data. An accurate understanding of the phenomena is achieved and further studies are planned to verify the theory.
Another area of interest is the environmental damage monitoring and analysis of metallic foam reinforced sandwich panels. For a recently concluded programme of research, damage modes for metallic foam and honeycomb cores reinforced aluminium alloys were investigated by using scanning electron microscope. The damage samples were fatigue tested and the affect of environmental damage on component fatigue life predicted.
Research collaborations
“Design and Manufacture of Continuous Reinforced Composite Production Machine” in partnership with Joseph Rhodes Group Ltd, Wakefield, UK. 2011 - date.
“Modeling and simulation of forged Titanium casing for aerospace applications”, in partnership with Independent Forgings and Alloys, Sheffield, UK. 2009 - 2011.
Ministry of Education, Government of Iraq. 2009 - date.
Recent publications
All of Syed's papers can be accessed at SHURA.
Nasser, M A, Hasan, S T and Myriounis, D P, “A method of analysis to estimate thermal down-shock stress profiles in hollow cylinders when subjected to transient heat/cooling cycle”, ”, accepted for presentation and publication at 14th International Conference on Advances in Materials & Processing Technologies, Istanbul, Turkey, 13-16th July 2011.
Myriounis, D.P, Kordatos, E.Z,Hasan, S. T and Matikas, T.E ,“Crack tip stress field and fatigue crack growth monitoring using infrared lock-in thermography in A359/SiCp composites”, Strain, 46(3), 2010.
Hasan, S.T and Shaw, C.A., “A method of analysis to predict fatigue life estimation of aluminium honeycomb/metallic foam core sandwich panels”, Advances in Materials and Processing Technologies (AMPT 2010), Paris, France, 24-27 October 2010.
Myriounis, D.P, Hasan, S. T and Matikas, T.E ,“Predicting interfacial strengthening behaviour of particulate reinforced MMC – A micro-mechanistic approach”, Composite Interfaces 17(4), pp 347-355, 2010.