TODAY: Ankit Kumar, 31-Jan-23, 12:20 PM

[Ellad Tadmor]

AEM Mechanics Research Seminar

TODAY, Tuesday 31-Jan-2023, 12:20pm Central

In-person: Room 25, Mechanical Engineering Building, University of Minnesota

Online: Webinar registration link

 

Mr. Ankit Kumar
Department of Aerospace Engineering and Mechanics, University of Minnesota

Title: Exploding and jumping ceramics during phase transformation

Abstract: Shape memory alloys are recently being used for direct conversion of heat to electricity based on first order phase transformation. The main challenge of this type of transformation are the high cyclic reversibility and minimization of hysteresis. The systematic tuning of crystal lattice parameters to achieve improved kinematic compatibility between different phases is a broadly effective strategy for improving the reversibility and lowering the hysteresis of solid–solid phase transformations.

     Paradoxical behaviors were seen during phase transformation of zirconia based ceramic oxides in which tuning crystal lattice parameters to near perfect kinematic compatibility results in an unusually high degree of irreversibility. The ceramic sample showed different behavior like jumping and explosively disintegrating.

     Phase transformation is accompanied with elastic wave emission. In this talk, I will discuss these paradoxical behaviors by analyzing the stresses developed due to wave propagation during phase transformation and role of phase boundary velocity for 1D case.

For more information, visit the AEM Mechanics Research Seminar website:

https://dept.aem.umn.edu/info/seminars/Solids/

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Ellad B. Tadmor, Professor

Department of Aerospace Engineering and Mechanics
University of Minnesota
107 Akerman Hall, 110 Union St SE
Minneapolis, MN 55455, USA

tel:   612-625-6642
fax:   612-626-1558
web:   Tadmor Website | Modeling Materials Book Website
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