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Researchers in Qatar target cancer and a national collaboration with CERN
Researchers in Qatar target cancer and a national collaboration with CERN

Researchers in Qatar target cancer and a national collaboration with CERN

At the European Organization for Nuclear Research, or Conseil Européen pour la Recherche Nucléaire (CERN), physicists and engineers use the world’s largest and most sophisticated scientific instruments to study the simplest forms of matter. This facility most recently drew worldwide attention as the grounds of the recently discovered Higgs boson, a discovery that won the 2013 Nobel Prize in physics.

Researchers build the case for wind and wave studies in Qatar
Researchers build the case for wind and wave studies in Qatar

Researchers build the case for wind and wave studies in Qatar

For the first time, fine detail about the wind and wave conditions around the coast of Qatar has been recorded. By arranging the most sophisticated equipment available on the edge of a 500-meter pier extending into the Gulf, a research team at Texas A&M University at Qatar (TAMUQ) has collected detailed readings of air and wave currents around the peninsula. Their findings highlight a dearth of information on coastal conditions that have the potential to offer vital insights into many sectors.

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Haya H Al Muhannadi
/ Categories: Publications

Emergence of fibrous fan morphologies in deformation directed reformation of hyperelastic filamentary networks

Author(s): Demirkoparan, H (Demirkoparan, Hasan); Pence, TJ (Pence, Thomas J.); Wineman, A (Wineman, Alan)

Recently, the authors generalized a theory for modelling the scission and reforming of crosslinks in isotropic polymeric materials to include materials in which elastic fibers are embedded in an elastic matrix. The fibers were assumed to dissolve with increasing deformation and then to immediately reassemble in a direction defined as part of the model. The model was illustrated in detail for uniaxial stretching along the direction of the fibers. Fiber reassembly was along the original fiber direction and did not result in a change in fiber alignment. The present work examines the implications of this model when the direction of reassembly is uncorrelated with the original fiber direction. In particular, the fibers are assumed to reassemble in the direction of maximum principal stretch of the matrix. The specific case is treated when the deformation is simple shear and the initial fiber direction is perpendicular to the direction of shear. The resulting fiber elongation with increasing shear results in fiber dissolution over a constitutively determined interval of the amount of simple shear. Newly formed fibers align in the current principal direction of maximum stretch, which is a direction that changes with the amount of simple shear. The resulting interval of alignment angles generates a fan-like fiber morphology at each material point. The formation and structure of the fan is described. In addition, the relation between the shear and normal stresses and the amount of shear is discussed, both during loading and unloading. It is shown that there can be a state of permanent set that is related to the original shape by triaxial extension and shear.

Author(s):  Demirkoparan, H (Demirkoparan, Hasan); Pence, TJ (Pence, Thomas J.); Wineman, A (Wineman, Alan)
Addresses:  [Wineman, Alan] Univ Michigan, Dept Mech Engn, Ann Arbor, MI 48109 USA; [Demirkoparan, Hasan] Carnegie Mellon Univ Qatar, Doha, Qatar; [Pence, Thomas J.] Michigan State Univ, Dept Mech Engn, E Lansing, MI 48824 USA
Source:  JOURNAL OF ENGINEERING MATHEMATICS, 68 (1): 37-56 SEP 2010
DOI: 10.1007/s10665-009-9357-0
Publisher:  SPRINGER
Funding Agency:  This material is based upon work that is partially supported by Carnegie Mellon University in Qatar, under the sponsorship of the Qatar Foundation.
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