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Materials Engineering Group
 


Research / Student / Moshir Rahman

Moshiur Rahman

m.rahman@open.ac.uk

+44 (0) 1908 658944

Student Project;
A fundamental experimental and theoretical study of fatigue crack propagation in polycrystalline materials

 

PROJECT COMPLETE


Moshir Rahman

I studied for a PhD in the Materials Engineering Department at the Open University. My research topic was entitled “A fundamental experimental and theoretical study of fatigue crack propagation in polycrystalline materials”.

I obtained the degree of BSc Engineering (mechanical) from the Bangladesh Institute of Technology (BIT), Khulna, Bangladesh in 1990. I then joined the Bangladesh Atomic Energy Commission, a government research organization of Bangladesh in 1991. I worked there as an Assistant Engineer and thereafter as a Senior Engineer until January 2001. I was awarded the degree of MSc in Mechanical Engineering (from my research) at the University of Glasgow in 2003. The research topic for my MSc was entitled “Crack tip plasticity in mixed mode loading under controlled yielding conditions”.

I am pleased to have had the opportunity to undertake my research here. The Department is well equipped with laboratory facilities, computational codes and software for performing my research. The people in the Department help to create a good working environment.

The objective of my research was to provide insight into the mechanism of fatigue crack propagation in polycrystalline materials. The work included experimental and theoretical investigation of the crack tip as well as crack wake stress and strain fields as a function of loading history under both constant and variable amplitude loading. My experimental study included mainly non-destructive high energy synchrotron x-ray diffraction strain measurement technique. Experiments were performed at ESRF (European Synchrotron Radiation Facility), Grenoble, France. Aluminium alloy AA-5091 Compact Tension (CT) specimens with different loading history are used in the current study.

My theoretical investigation involved analytical fracture mechanics calculations and finite element analysis, which complemented experimental results. Finite element code ABAQUS was employed in finite element modelling of the specimens used in experimental investigations.

Aircraft wings, railway axles etc. are the real examples of the components experiencing variable amplitude fatigue.This study will have contributed to enhancing fatigue life of the components containing crack by providing an insight into the crack tip and crack wake fields.

Publications

1. M. Rahman and J.W. Hancock, “Elastic Perfectly-Plastic Asymptotic Mixed Mode Crack Tip Fields in Plane Stress”, International Journal of Solids and Structures (Submitted in April, 2004 and currently under review).

2. M. Rahman, J. Li and J.W. Hancock, “Elastic Perfectly-Plastic Asymptotic Mixed Mode Crack Tip Fields in Plane Stress and Plane Strain”, TMS conference proceedings, 2002 “Mechanisms and Mechanics of Fractures: The John Knott Symposium”, 7-10 October, 2002, pp. 193-198,Columbus, Ohio, USA.

3. Md. Moshiur Rahman and Arfind S. Kumar, “Numerical and Experimental Evaluation of J-Integral for Pre-cracked Charpy Specimens”, Nuclear Science and Applications, Vol. 5, No. 1, 2, 1996.

4. S. M. Fazlul Karim, Md. Moshiur Rahman, M. Zakir Husein Faruquee and Saif Uddin Ahmad, “Vibration Measurement on the Primary System of the TRIGA Mk-II Research Reactor at AERE, Savar, BAEC, Dhaka, Bangladesh”, Nuclear Science & Applications, Vol. 6, No. 1, 2, 1997.

5. S. M. Fazlul Karim, Md. Moshiur Rahman, M. Zakir Husein Faruquee, M. Abdus Salam Akanda and Saif Uddin Ahmad, “An Experimental Rig for the Study of Heat Transfer and Fluid Flow in the TRIGA Mk-II Research Reactor at INST, AERE, Savar”, Nuclear Science & Applications, Vol. 6, No. 1, 2, 1997.

 

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