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Computational Contact and Adhesion Mechanics • Prof. Roger A. Sauer

Prof. Roger A. Sauer leads a DFG-funded Emmy-Noether Group within the AICES Graduate School. The group develops mechanical models and computational algorithms for adhesive contact problems based on the framework of nonlinear continuum mechanics, homogenization, i.e. coarse-graining, and finite element modeling. The challenges in this research area lie in the formulation of constitutive interface laws, complex surface microstructures, multiscale and multi-field aspects, and numerical issues like efficiency, accuracy and stability. The initial research of Prof. Sauer considered adhesive contact between nanoscale solids; new considerations include contact algorithms, advanced surface discretization techniques, adhesion at liquid interfaces, contact optimization and scale-bridging techniques for contact.

The research interests of the group are:

  • Adhesion at different length scales
  • Biomechanical contact and adhesion
  • Cohesive zone modeling
  • Contact mechanics
  • Constitutive interface laws
  • Debonding and delamination
  • Finite element methods for contact
  • Friction and wear
  • Multi-field modeling of contact
  • Multiscale methods for contact
  • Optimization of contact mechanisms
  • Self-cleaning surfaces
  • Surface characterization and tailoring
  • Surface energy driven systems
  • Surface wetting
  • Time-integration schemes for adhesion

2011 2015

Research Gallery


Adhesive Contact


Adhesion of spherical particles
considering large deformations
(Sauer and Li, 2007)

Peeling behavior of flexible beams:
Influence of the bending stiffness
(Sauer, 2011)
 
Peeling between deformable bodies
using NURBS-enriched contact elements
(Corbett and Sauer, 2015)

Gecko Adhesion


Detachment of a gecko spatula
(Sauer and Holl, 2013; Sauer and Mergel, 2014)

Detachment of a gecko seta
(Sauer, 2009; Sauer, 2010)
&
Rough surface contact of a gecko spatula
Sauer and Holl, 2013)

Contact Enrichment


Enriched surface finite elements
(Sauer, 2012; Corbett and Sauer, 2014)

NURBS-based surface enrichment
(Corbett and Sauer, 2015)

Unbiased Contact Algorithms


The two-half-pass contact algorithm
compared to classical full-pass approaches
(Sauer and De Lorenzis, 2013)

Frictional sliding contact computed with
the two-half-pass contact algorithm
(Sauer and De Lorenzis, 2015)

Frictional twisting contact computed with
the two-half-pass contact algorithm
(Sauer and De Lorenzis, 2015)

MD-based Surrogate Contact Models


Indentation of a self-assembled polymer layer:
Comparison between molecular dynamics and surrogate continuum model
(Schmidt et al., 2014)

Contact deformation of a carbon-nanotube:
Comparison between molecular dynamics and surrogate beam model
(Schmidt et al., 2015)

Isogeometric Membrane and Shell Formulations


Inflation of a membrane
(Sauer et al., 2014)

Pinched shell
(Duong et al., 2016)

Shell bending: Continuity between NURBS patches
(Duong et al., 2016)

Droplet Contact


Rough surface contact of a liquid droplet
(Sauer, 2014; Osman and Sauer, 2015)

Wetting deformation caused by a liquid droplet
(Sauer, 2016a)

Sliding contact of a liquid droplet
(Sauer, 2016b)

Lipid Bilayers


Tethering of a lipid bilayer
(Sauer et al., 2016)

Viscous budding of a spherical vesicle
(Sauer et al., 2016)

Graphene Structures


Bending of a carbon-nanotube

Coupled Contact


Electrostatic attraction of deformable rings
(Sauer and De Lorenzis, 2013)