Large deformation adhesive contact mechanics of circular membranes with a flat rigid substrate

2010 ◽  
Vol 58 (9) ◽  
pp. 1225-1242 ◽  
Author(s):  
Rong Long ◽  
Kenneth R. Shull ◽  
Chung-Yuen Hui
Keyword(s):  
Large Deformation ◽  
Contact Mechanics ◽  
Adhesive Contact ◽  
Rigid Substrate

Numerical Method of Analyzing Contact Mechanics between a Sphere and a Flat Considering Lennard-Jones Surface Forces of Contacting Asperities and Noncontacting Rough Surfaces

2012 ◽  
Vol 134 (1) ◽  
Author(s):  
Kyosuke Ono
Keyword(s):  
Numerical Method ◽  
Contact Mechanics ◽  
Rough Surfaces ◽  
Present Theory ◽  
Adhesive Contact ◽  
Adhesive Force ◽  
Surface Forces ◽  
Contact Theory ◽  
Magnetic Disk ◽  
Lennard Jones

A new numerical method of analyzing adhesive contact mechanics between a sphere and a flat with sub-nanometer roughness is presented. In contrast to conventional theories, the elastic deformations of mean height surfaces and contacting asperities, and Lennard-Jones (LJ) surface forces of both the contacting asperities and noncontacting rough surfaces including valley areas are taken into account. Calculated contact characteristics of a 2-mm-radius glass slider contacting a magnetic disk with a relatively rough surface and a 30-mm-radius head slider contacting a currently available magnetic disk with lower roughness are shown in comparison with conventional adhesive contact theories. The present theory was found to give a larger adhesive force than the conventional theories and to converge to a smooth sphere-flat contact theory as the roughness height approaches zero.

scholarly journals Large Deformation and Adhesive Contact Studies of Axisymmetric Membranes

Langmuir ◽  
2013 ◽  
Vol 29 (5) ◽  
pp. 1407-1419 ◽  
Author(s):  
Evan J. Laprade ◽  
Rong Long ◽  
Jonathan T. Pham ◽  
Jimmy Lawrence ◽  
Todd Emrick ◽  
...  
Keyword(s):  
Large Deformation ◽  
Adhesive Contact

scholarly journals A Tribometric Device for the Rolling Contact of Soft Elastomers

2021 ◽  
Author(s):  
Brodie Hoyer ◽  
Rong Long ◽  
Mark E. Rentschler
Keyword(s):  
Contact Mechanics ◽  
Fundamental Problem ◽  
Finite Thickness ◽  
Medical Robotics ◽  
Adhesive Contact ◽  
Rolling Contact ◽  
Experimental Investigations ◽  
Pdms Substrate ◽  
Textured Surfaces ◽  
Tribometric Device

Abstract Rolling contact experimentation is a viable and instructive method for exploring the adhesive contact between surfaces. When applied to soft elastomeric or engineered surfaces, the results of such experiments can provide insights relevant to medical robotics, soft gripping applications, and reversible dry adhesives for bandages or wearable devices. We have designed and built a tribometric device to capture normal and tangential forces between a rolling indenter and substrate correlated with contact area imaging. The device was validated using an experimental setup involving a rigid, nominally smooth acrylic cylinder rolling against a flat polydimethylsiloxame (PDMS) substrate, the results of which matched favorably with accepted contact mechanics theories. The second test involved an indenter with a rigid core and thin (3 mm) smooth shell of a highly deformable, viscoelastic polyvinyl chloride (PVC) rolling on the same PDMS substrate. This test deviated significantly from analytical predictions, highlighting the effects of finite-thickness effects, viscoelasticity, and interfacial slip. This device will facilitate experimental investigations of the rolling contact mechanics between textured surfaces and soft tissue-like materials, which is an important fundamental problem in medical robotics.

scholarly journals Large deformation contact mechanics of a pressurized long rectangular membrane. II. Adhesive contact

2013 ◽  
Vol 469 (2160) ◽  
pp. 20130425 ◽  
Author(s):  
Abhishek Srivastava ◽  
Chung-Yuen Hui
Keyword(s):  
Fracture Mechanics ◽  
Boundary Conditions ◽  
Detailed Analysis ◽  
Plane Strain ◽  
Applied Pressure ◽  
Adhesive Contact ◽  
Slip Boundary Conditions ◽  
Rigid Substrate ◽  
Stable States ◽  
Slip Boundary

In part I of this work, we presented a theory for adhesionless contact of a pressurized neo-Hookean plane-strain membrane to a rigid substrate. Here, we extend our theory to include adhesion using a fracture mechanics approach. This theory is used to study contact hysteresis commonly observed in experiments. Detailed analysis is carried out to highlight the differences between frictionless and no-slip contact. Membrane detachment is found to be strongly dependent on adhesion: for low adhesion, the membrane ‘pinches-off’, whereas for large adhesions, it detaches unstably at finite contact (‘pull-off’). Expressions are derived for the critical adhesion needed for pinch-off to pull-off transition. Above a threshold adhesion, the membrane exhibits bistability, two stable states at zero applied pressure. The condition for bistability for both frictionless and no-slip boundary conditions is obtained explicitly.

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