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MSDL in a Nutshell

In an ideal world, a jet engine turbine blade would never crack, would never fatigue, would never creep, would withstand as high a temperature as we can impose, and would be as light and as strong as we can imagine. In the real world, to take even partial steps towards such goals, we need a deep understanding of materials performance at many length and time scales. At nano and meso scales, the mismatch between elastic and plastic properties of each grain in a polycrystalline material results in local stress concentrations and in crack nucleation which eventually limits the life and performance of a design. Understanding the nature and the source of local stress heterogeneities and their impact on the macroscopic behaviour require development of numerical methods describing each length and time scale, approaches to bridge between methods, and the use or development of cutting edge experimental techniques to validate the numerical results. 

Our research focuses on the development of different numerical methods and on the linking of them to diffraction and image based experimental techniques. At MSDL we seek to explain the effects of various environments on the performance and integrity of metallic and nonmetallic composite materials. 


Research topics:

  • Mechanics of materials across length and time scales- both modeling and experimental.
  • Fatigue, fracture, and (irradiation) creep.  
  • Finite element, crystal plasticity, and dislocation dynamics.
  • Synchrotron x-ray, neutron, and electron diffraction/imaging.
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News

March 2018: New paper accepted for publication in International Journal of PlasticityAbdolvand, H.*, Wright, J., Wilkinson, A.J., “On the state of deformation in a polycrystalline material in three-dimension: elastic strains, lattice rotations, and deformation mechanisms”: DOI: 10.1016/j.ijplas.2018.03.006


Feb 2018: We spent a week at ID-11, ESRF, and collected more than 4 TB of diffraction data while deforming zirconium and magnesiumKarim will be busy with post-processing the data. Good luck to him! Jon Wright and Marta Majkut provided tremendous support during the experiment. Our Magnesium samples were prepared at ENSAM with the help of Dr. Charles Mareau.


Jan 2018: ** Results of our recent research on HCP polycrystals are published in Nature CommunicationsThe paper is available to public at DOI: 10.1038/s41467-017-02213-9 (Featured in Western News).

** Release of data-set: 3D-XRD and HR-EBSD data in support of this article are openly available at DOI: 10.5281/zenodo.1042139

** CPFE results are also included in the data set.

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Selected Publications:

Abdolvand, H.*, Wright, J., Wilkinson, A.J., “Strong Grain Neighbour Effects in Polycrystals”, Nature Communications, 2018, 9, 171, DOI: 10.1038/s41467-017-02213-9

 Abdolvand H.*, Wilkinson AJ., "On the effects of reorientation and shear transfer during twin formation: comparison between high resolution electron backscatter diffraction experiments and a crystal plasticity model". International Journal of Plasticity, 2016, Vol 84, P 160-182 . DOI: 10.1016/j.ijplas.2016.05.00 

Abdolvand H.*, Wilkinson AJ., "Assessment of residual stress fields at deformation twin tips and the surrounding environments". Acta Materialia, 2016, Vol 105, P 219-231. DOI: 10.1016/j.actamat.2015.11.036

Abdolvand, H.*, Daymond, M. R., “Multi-Scale Modeling and Experimental Study of Twin Inception and Propagation in Hexagonal Close-Packed Materials Using a Crystal Plasticity Finite Element Approach; Part II: Local Behavior”, Journal of The Mechanics and Physics of Solids, 2013, Vol 61 (3), Page 803-818, DOI: 10.1016/j.jmps.2012.10.017



Meet us at:

Talk by Hamid Abdolvand: Deformation of polycrystals at multiple scales: linking 3D X-ray diffraction to FE modeling.

Talk by Hamid Abdolvand: Stress hot spots in HCP polycrstals
 
Talk by Hamid Abdolvand- March 6, at 1:30 PM. 
Location: Health Sciences Building (HSB), Room 236, Western University.