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Research / Students / Muhammad Kashif Khan

Muhammad Kashif Khan

m.k.khan@open.ac.uk

+44 (0) 1908 658965

Student Project;
Scribe Marks at Fuselage Joints- Role of Residual Stress and Local Geometry on Initiation and Propagation of fatigue Cracks

PROJECT COMPLETE


Muhammad Kashif Khan

Background

I graduated in Mechanical Engineering from NED University of Engineering and Technology, Karachi , Pakistan in 2001 and then afterwards did Postgraduation in Mechanical Design Engineering in 2006 at the same university.

I have worked in Research and Development departments of Suzuki Motorcycles Pakistan and National Space Agency of Pakistan SUPARCO (Pakistan Space and Upper Atmosphere Research Commission) on materials like Aluminium, Composites and Honeycomb Sandwich Panels.

PhD Project

I am very pleased with my PhD project which I started in Dec 2006 in the Department of Materials Engineering and completred in 2010. The project was about characterisation of residual stresses around small mechanical defects on aircrafts. The title of project is; “Scribe Marks at Fuselage Joints- Role of Residual Stress and Local Geometry on Initiation and Propagation of fatigue Cracks”

Service lives of complex structures such as aircraft and helicopters are limited by degradation processes of mechanical damage, corrosion and fatigue. During service the incidence of damage caused by all three processes increases continuously. These damages transform to propagating fatigue cracks which limit the life of the structure and causes premature failure. It is therefore important to be able to assess corrosion pits and mechanical defects such as scratches and impact damage in terms of calculation of the service life at which fatigue cracks are initiated and secondly prediction of the subsequent life to failure.

The project was involved with usage of novel techniques like Nanoindentation, surface scanning with Atomic Force Microscope; Lab based X-ray Diffractometers, Tomography and Residual Stress measurement through Synchrotron X-ray sources and Finite Element Modelling of Residual Stresses around small defects.

MTS Nanoindenter

Berkovitch nanoindent

 

Studying at OU

The department of Materials Engineering of OU is well equipped with sate of the art experimental facilities along with computational packages to carry out research related to my project. My supervisors Prof. Lyndon Edwards and Prof. Mike Fitzpatrick were very cooperative and supportive.

 

Publications

  • M. K. Khan , “Mechanical Properties of Aluminium and Glass Fiber Facings Honeycomb Sandwich Panels from ASTM Standards” (Engineer PEC, Journal of Pakistan Engineering Council, Issue 1, June 2006). http://www.suparco.gov.pk/downloadables/properties-honeycomb.pdf

  • M. K. Khan , “Compressive and Lamination Strength of Honeycomb Sandwich Panels with Strain Energy Calculation from ASTM Standards” ( Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering , UK . Vol.220, No. 5 , October 2006)

  • M.K.Khan , K. Bashir, S. Moizuddin, S. Hussain . " Natural frequency determination and modal analysis of prototype structure of honeycomb sandwich panels" . Proceeding of 3rd Internmational conference on Recent advances in space technologies, Istanbul, Turkey , June 2007.
  • M.K.Khan, Hainsworth S.V, M.E. Fitzpatrick, L.E. Edwards. " Application of work of indentation approach for the characterization of aluminium 2024-T351 and Al cladding by nanoindentation." Journal of Materials Science, Feb 2009. Vol 44, issue4, pages 1006-1015.
  • M.K.Khan, M.E. Fitzpatrick, Hainsworth S.V, L.E. Edwards "Effect of tool profile and fatigue loading on the local hardness around scratches in clad and unclad aluminium alloy 2024" Materials Science and Engineering A, 527 (2009), 297–304. http://oro.open.ac.uk/17851/1/MSEA_article_MKK_mef.pdf

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