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DTSTART:20150909T140000
DTEND:20150909T150000
SUMMARY:DCAMM Seminar - Computational modelling of mesoscale dislocation patterning and plastic deformation of single crystals 
DESCRIPTION:<p style="text-align: left;">A DCAMM seminar&nbsp;will be presented by </p>\n<p align="center" style="margin: 0cm 0cm 10pt 1cm; text-align: center;"><strong><span>Professor Anter El-Azab, <br>\nSchool of Materials Engineering<br>\nPurdue University<br>\nWest Lafayette, IN 47907, USA<br>\n</span></strong>\n<strong> <br>\n</strong></p>\n<p style="text-align: justify;"><strong>Abstract</strong>: <br>\n<br>\n<span> </span><span>A continuum dislocation dynamics model is presented that predicts the formation of dislocation cell structure in single crystals at low &nbsp;strains. The model features a set of kinetic equations of the curl type that govern the space and time evolution of the dislocation density&nbsp;in the crystal. These kinetic equations are coupled to stress equilibrium and deformation kinematics using the eigenstrain approach. A&nbsp; custom finite element method has been developed to solve the coupled system of equations of dislocation kinetics and crystal mechanics. The results show that, in general, dislocations self-organize in patterns under their mutual interactions. However, the famous dislocation&nbsp;&nbsp;cell structure has been found to form only when cross slip is implemented in the model. Cross slip is also found to lower the yield point,&nbsp;increase the hardening rate, and sustain an increase in the dislocation density over the hardening regime. Analysis of the cell structure evolution reveals that the average cell size decreases with the applied stress, which is consistent with the similitude principle.<br>\n<br>\nDanish pastry, coffee and tea will be served 15 minutes before the seminar starts.<br>\n&nbsp;&nbsp;</span><br>\nAll interested persons are invited</p>
X-ALT-DESC;FMTTYPE=text/html:<p style="text-align: left;">A DCAMM seminar&nbsp;will be presented by </p>\n<p align="center" style="margin: 0cm 0cm 10pt 1cm; text-align: center;"><strong><span>Professor Anter El-Azab, <br>\nSchool of Materials Engineering<br>\nPurdue University<br>\nWest Lafayette, IN 47907, USA<br>\n</span></strong>\n<strong> <br>\n</strong></p>\n<p style="text-align: justify;"><strong>Abstract</strong>: <br>\n<br>\n<span> </span><span>A continuum dislocation dynamics model is presented that predicts the formation of dislocation cell structure in single crystals at low &nbsp;strains. The model features a set of kinetic equations of the curl type that govern the space and time evolution of the dislocation density&nbsp;in the crystal. These kinetic equations are coupled to stress equilibrium and deformation kinematics using the eigenstrain approach. A&nbsp; custom finite element method has been developed to solve the coupled system of equations of dislocation kinetics and crystal mechanics. The results show that, in general, dislocations self-organize in patterns under their mutual interactions. However, the famous dislocation&nbsp;&nbsp;cell structure has been found to form only when cross slip is implemented in the model. Cross slip is also found to lower the yield point,&nbsp;increase the hardening rate, and sustain an increase in the dislocation density over the hardening regime. Analysis of the cell structure evolution reveals that the average cell size decreases with the applied stress, which is consistent with the similitude principle.<br>\n<br>\nDanish pastry, coffee and tea will be served 15 minutes before the seminar starts.<br>\n&nbsp;&nbsp;</span><br>\nAll interested persons are invited</p>

URL:http://www.dcamm.dk/da/Kalender/2015/09/Seminar_No_693
DTSTAMP:20260919T123600Z
UID:{272235E6-1DC6-4389-9DE6-F51FA30DFE76}-20150909T140000-20150909T140000
LOCATION: Room 105, Building 404, Technical University of Denmark
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