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Faculty of Science

Department of Physics & Astronomy

Dr. Joseph Paulson - Syracuse University

Description

Title: Between a droplet and a soft place: The extreme mechanics of thin sheets 

Speaker: Dr. Joseph Paulson

Institute: Syracuse University

Location: ABB-241

Description: When unrolling plasticwrap, handling a large flimsy poster, or watching a fluttering flag, we becomeaware of the multitude of deformations that are available to thin materials.These scenarios suffer from geometric nonlinearities that make their analysisnotoriously difficult. Here I present a general approach that circumvents thesedifficulties for highly flexible films attached to liquid surfaces. First, Iwill show how an initially-flat polymer film wraps itself around a waterdroplet whose volume is gradually decreased. The resulting conformations arehighly non-axisymmetric and are patterned with small-scale wrinkles, folds, andcrumples. Remarkably, the essence of the wrapping process can be understoodwithout describing any of these complicated small-scale features. Inparticular, a thin sheet spontaneously minimizes the area of the exposed watersurface. I will then show how this general geometric principleapplies to the indentation of a floating polymer film, where it explains themechanical stiffening and softening of the normal force that we observe in ourexperiments and simulations. ​

Website http://asfaculty.syr.edu/pages/phy/paulsen-joseph.html

McMaster University - Faculty of Science

Mailing Address

Department of Physics & Astronomy,
McMaster University

ABB-241
1280 Main Street West
Hamilton, Ontario, Canada
L8S 4M1

Contact Information

Telephone Inquiries:
+1 (905) 525-9140 ext.24559
Fax:
(905) 546-1252
Email Inquiries:
physics@mcmaster.ca

McMaster University - Faculty of Science

Mailing Address

Department of Physics & Astronomy,
McMaster University

ABB-241
1280 Main Street West
Hamilton, Ontario, Canada
L8S 4M1

Contact Information

Telephone Inquiries:
+1 (905) 525-9140 ext.24558
Fax:
(905) 546-1252
Email Inquiries:
physics@mcmaster.ca