Prof. Roger A. Sauer, Ph.D.
Contact
Aachen Institute for Advanced Study in Computational Engineering Science (AICES)RWTH Aachen University
Schinkelstrasse 2a
52056 Aachen
Germany
Phone: +49 241 80 99129
Fax: +49 241 80 628498
Email: sauer (AT) aices (DOT) rwthaachen (DOT) de
Education
PhD in Computational Mechanics, University of California at Berkeley, USA, 2006
MSc in Computational Mechanics, University of California at Berkeley, USA, 2003
Dipl.Ing. in Civil Engineering, University of Karlsruhe, Germany, 2002
Exchange student at the University of Edinburgh, Scotland, 1998/99
Professional Career
since July 2014: Associate Professor in Mechanical Engineering
2014  2015: Deputy Scientific Director of the Graduate School AICES
2012  2014: Member of the Junges Kolleg, NRW Academy of the Sciences and Arts
since Jan 2010: Research group leader at AICES, RWTH Aachen University, Germany
2009  2014: Funded by the Emmy Noether program of the DFG
2008  2009: Young research group leader at the Institute for Continuum Mechanics, Leibniz University Hannover, Germany
2007  2008: Post Doc. at the Institute of Mechanics and Computational Mechanics, Leibniz University Hannover, Germany
2002  2006: Research and teaching assistant at the Department of Civil Engineering, University of California at Berkeley, USA
Research Interests
Nonlinear continuum mechanics, advanced finite element methods, multiscale methods, contact mechanics, biomechanical adhesion, nonlinear membrane and shell theories, selfcleaning surface mechanisms, biological cell membranes
Research group website: Computational Contact and Adhesion Mechanics
Teaching
WS 2016/17: Computational Contact Mechanics: scheduled on Wednesdays from 8:159:45 & 10:0011:30 in 001 GRS. The lecture starts with an introductory meeting on Friday, Oct. 21 from 10:0011:30 in 115 Rogowski.
WS 2016/17: Computational Multiphysics: scheduled on Fridays from 8:159:45 in 115 Rogowski. The lecture starts with an introductory meeting on Friday, Oct. 21 from 10:0011:30 in 115 Rogowski.
WS 2016/17: Advanced Topics in Contact Mechanics (seminar for doctoral and advanced master students): scheduled on Fridays from 10:0011:30 in 115 Rogowski.
SS 2017: From Molecular to Continuum Physics II: held Tuesdays, 9:1511:45 and Fridays, 10:1511:45, in 001 GRS, starting from April 21st.
SS 2017: Nonlinear Finite Element Methods for Solids: held on Thursdays and Fridays from 12:1513:45 in kleine Physik, starting from April 20th.
SS 2017: Computational Modeling of Membranes and Shells: held on Wednesday mornings from 8:1510:45 in 115 Rogowski, starting from April 19th.
SS 2017: Advanced Topics in Computational Mechanics (seminar for doctoral and advanced master students): held on Wednesdays from 11:0012:30, starting on April 19th.
Lecture and exercise notes will be posted on L2P
The lecture 'From Molecular to Continuum Physics II' is supported from Quality Improvement Funds (Qualitätsverbesserungsmittel). The contact person for the use of these funds is Roger Sauer. Further information concerning the use of QVM funds in the faculty of mechanical engineering can be found here.
Publications: Book Chapters


Sauer, R.A.: "On the computational modeling of lipid bilayers using thinshell theory", in D. Steigmann, editor, The role of mechanics in the study of lipid bilayers, in press, Springer, 2017  


Kumar, P., Saxena, A., Sauer, R.A.: "Implementation of self contact in path generating compliant mechanisms", in L. Zentner, B. Corves, B. Jensen and E.C. Lovasz, editors, Microactuators and Micromechanisms, pp. 251261, Springer, 2016, pdf  


Osman, M., Sauer, R.A.: "Computational analysis of wetting on hydrophobic surfaces: Application to selfcleaning mechanisms", in K.L. Mittal, editor, Advances in Contact Angle, Wettability and Adhesion, Vol. 2, pp. 129147, Wiley, 2015, pdf  


Osman, M., Rasool, R., Sauer, R.A.: "Computational aspects of selfcleaning surface mechanisms", in K.L. Mittal, editor, Advances in Contact Angle, Wettability and Adhesion, Vol. 1, pp. 109130, Wiley, 2013, pdf  


Sauer, R.A.: "Computational contact formulations for soft body adhesion", in Li, S. and Sun, B., editors, Advances in Soft Matter Mechanics, pp. 5593, Springer, 2012, pdf  


Sauer, R.A.: "Challenges in computational nanoscale contact mechanics", in MuellerHoeppe, D., Loehnert, S. and Reese, S., editors, Recent Developments and Innovative Applications in Computational Mechanics, pp. 3946, Springer, 2011, pdf 
Refereed Journal Publications (arranged by online publication)
2017  


Roohbakhshan, F., Sauer, R.A.: "Efficient isogeometric thin shell formulations for soft biological materials", Biomech. Model. Mechanobiol., published online, 2017  
2016  


Roohbakhshan, F., Sauer, R.A.: "Isogeometric nonlinear shell elements for thin laminated composites based on analytical thickness integration", J. Micromech. Mol. Phys. 1(34), pp. 1640010, 2016  


Sauer, R.A., Duong, T.X, Mandadapu, K.K., Steigmann, D.J.: "A stabilized finite element formulation for liquid shells and its application to lipid bilayers", J. Comput. Phys. 330, pp. 436466, 2017, preprint, final pdf  


Mergel, J.C., Sauer, R.A., OberBlöbaum, S.: "C1continuous spacetime discretization based on Hamilton’s law of varying action", ZAMM, published online, 2016, preprint, pdf  


Sauer, R.A.: "A frictional sliding algorithm for liquid droplets", Comput. Mech. 58(6), pp. 937–956, 2016, pdf  


Harmel, M., Sauer, R.A., Bommes, D.: "Volumetric mesh generation from Tspline surface representations", Comput. Aid. Des. 82, pp. 1328, 2017, pdf  


Duong, T.X., Roohbakhshan, F., Sauer, R.A.: "A new rotationfree isogeometric thin shell formulation and a corresponding continuity constraint for patch boundaries", Comput. Methods Appl. Mech. Engrg. 316, pp. 4383, 2017, pdf (with minor corrections)  


Kumar, P., Sauer, R.A., Saxena, A.: "Synthesis of C0 pathgenerating contactaided compliant mechanisms using the material mask overlay method", J. Mech. Design 138(6), 062301, 2016, pdf  


Rasool, R., Corbett, C.J., Sauer, R.A.: "A strategy to interface isogeometric analysis with Lagrangian finite elements  application to incompressible flow problems", Comp. Fluids 127, pp. 182193, 2016, pdf  
2015  


Sauer, R.A.: "A survey of computational models for adhesion", J. Adhesion 92(2), pp. 81120, 2016, pdf  


Roohbakhshan, F., Duong, T.X., Sauer, R.A.: "A projection method to extract biological membrane models from 3D material models", J. Mech. Behav. Biomed. Mat. 58, pp. 90104, 2016, pdf  


Sauer, R.A., Duong, T.X.: "On the theoretical foundations of thin solid and liquid shells", Math. Mech. Solids 22(3), pp. 343371, 2017, pdf  


Schmidt, M.G., Ismail, A.E., Sauer, R.A.: "A continuum mechanical surrogate model for atomic beam structures", Int. J. Multiscale Comput. Engrg. 13(5), pp. 413–442, 2015, pdf  
2014  


Corbett, C.J., Sauer, R.A.: "Threedimensional isogeometrically enriched finite elements for frictional contact and mixedmode debonding", Comput. Methods Appl. Mech. Engrg. 284, pp. 781806, 2015, pdf  


Duong, T.X., Sauer, R.A.: "An accurate quadrature technique for the contact boundary in 3D finite element computations", Comput. Mech. 55(1), pp. 145166, 2015, pdf  


Sauer, R.A., De Lorenzis, L.: "An unbiased computational contact formulation for 3D friction", Int. J. Numer. Meth. Engng. 101(4), pp. 251280, 2015, pdf  


Osman, M., Sauer, R.A.: "A parametric study of the hydrophobicity of rough surfaces based on finite element computations", Colloids and Surfaces A 461, pp. 119125, 2014, pdf  


Schmidt, M.G., Sauer, R.A., Ismail, A.E.: "Multiscale treatment of mechanical contact problems involving thin polymeric layers", Modell. Simul. Mater. Sci. Eng. 22, 045012, 2014, pdf  


Gautam, S.S., Sauer, R.A.: "A composite time integration scheme for dynamic adhesion and its application to gecko spatula peeling", Int. J. Comput. Methods 11(5), 1350104, 2014, pdf  


Sauer, R.A.: "Stabilized finite element formulations for liquid membranes and their application to droplet contact", Int. J. Numer. Meth. Fluids 75(7), pp. 519545, 2014, pdf  


Sauer, R.A.: "A contact theory for surface tension driven systems", Math. Mech. Solids 21(3) pp. 305325, 2016, pdf  


Mergel, J.C., Sauer, R.A.: "On the optimum shape of thin adhesive strips for various peeling directions", J. Adhesion 90(56), pp. 526544, 2014, pdf  


Corbett, C.J., Sauer, R.A.: "NURBSenriched contact finite elements", Comput. Methods Appl. Mech. Engrg. 275, pp. 5575, 2014, pdf  


Mergel, J.C., Sauer, R.A., Saxena, A.: "Computational optimization of adhesive microstructures based on a nonlinear beam formulation", Struct. Multidisc. Optim. 50(6), pp. 10011017, 2014, pdf  


Sauer, R.A., Mergel, J.C.: "A geometrically exact finite beam element formulation for thin film adhesion and debonding", Finite Elem. Anal. Des. 86, pp. 120135, 2014, pdf  
2013  


Sauer, R.A., Duong, X.T, Corbett, C.J.: "A computational formulation for constrained solid and liquid membranes considering isogeometric finite elements", Comput. Methods Appl. Mech. Engrg. 271, pp. 4868, 2014, preprint, final pdf  
2012  


Gautam, S.S., Sauer, R.A.: "An energymomentumconserving temporal discretization scheme for adhesive contact problems", Int. J. Numer. Meth. Engng. 93(10), pp. 10571081, 2013, pdf  


Sauer, R.A.: "Local finite element enrichment strategies for 2D contact computations and a corresponding postprocessing scheme", Comput. Mech. 52(2), pp. 301319, 2013, pdf  


Sauer, R.A., De Lorenzis, L.: "A computational contact formulation based on surface potentials", Comput. Methods Appl. Mech. Engrg. 253, pp. 369395, 2013, pdf  


Sauer, R.A.: "Advances in the computational modeling of the gecko adhesion mechanism", J. Adhes. Sci. Technol. 28(34), Special Issue on Bioinspired Adhesion, pp. 240255, 2014, pdf  


Saxena, A., Sauer, R.A.: "Combined gradientstochastic optimization with negative circular masks for large deformation topologies", Int. J. Numer. Meth. Engng. 93(6), pp. 635663, 2013, pdf  


Sauer, R.A., Holl, M.: "A detailed 3D finite element analysis of the peeling behavior of a gecko spatula", Comp. Meth. Biomech. Biomed. Engrg. 16(6), pp. 577591, 2013, pdf  
2011  


Sauer, R.A.: "The peeling behavior of thin films with finite bending stiffness and the implications on gecko adhesion", J. Adhesion 87 (78), pp. 624643, 2011, pdf  


Sauer, R.A.: "Enriched contact finite elements for stable peeling computations", Int. J. Numer. Meth. Engng. 87, pp. 593616, 2011, pdf  
2010  


Sauer, R.A.: "A computational model for nanoscale adhesion between deformable solids and its application to gecko adhesion", J. Adhes. Sci. Technol. 24, pp. 18071818, 2010, pdf  
2009  


Sauer, R.A., Wriggers, P.: "Formulation and analysis of a 3D finite element implementation for adhesive contact at the nanoscale", Comput. Methods Appl. Mech. Engrg. 198, pp. 38713883, 2009, pdf  


Sauer, R.A.: "Multiscale modeling and simulation of the deformation and adhesion of a single gecko seta", Comp. Meth. Biomech. Biomed. Engng. 12(6), pp. 627640, 2009, pdf  
2008  


Sauer, R.A., Li, S.: "An atomistically enriched continuum model for nanoscale contact mechanics and its application to contact scaling", J. Nanosci. Nanotech. 8(7), pp. 37573773, 2008, pdf  


Sauer, R.A., Wang, G., Li, S.: "The composite Eshelby Tensors and their application to homogenization", Acta Mech. 197, pp. 6396, 2008  
2007  


Sauer, R.A., Li, S.: "An atomic interactionbased continuum model for adhesive contact mechanics", Finite Elem. Anal. Des. 43(5), pp. 384396, 2007, pdf  


Sauer, R.A., Li, S.: "A contact mechanics model for quasicontinua", Int. J. Numer. Meth. Engrg. 71(8), pp. 931962, 2007, pdf  


Li, S., Wang, G., Sauer, R.A.: "The Eshelby Tensors in a finite spherical domain: II. Applications in homogenization", J. Appl. Mech. 74(4), pp. 784797, 2007  


Li, S., Sauer, R.A., Wang, G.: "The Eshelby Tensors in a finite spherical domain: I. Theoretical formulations", J. Appl. Mech. 74(4), pp. 770783, 2007  
2005  


Wang, G., Li, S., Sauer, R.: "A circular inclusion in a finite domain: II. The NeumannEshelby problem", Acta. Mech. 179(12) pp. 91110, 2005  


Li, S., Sauer, R., Wang, G.: "A circular inclusion in a finite domain: I. The DirichletEshelby problem", Acta. Mech. 179(12) pp. 6790, 2005 
Other Publications
2016  


Mergel, J.C., Sauer, R.A., OberBlöbaum, S.: "C1continuous time discretization based on cubic Hermite interpolation", Proc. Appl. Math. Mech. 16, pp. 753–754, 2016  
2015  


Kumar, P., Sauer, R.A., Saxena, A.: "On synthesis of contact aided compliant mechanisms using the material mask overlay method", ASME Proceedings of the 39th Mechanisms and Robotics Conference, DETC201547064, 2015, pdf  


Raste, H., Saxena, A., Sauer, R.A., Corves, B.: "Bioinspired mechanism synthesis for flapping flight with unsteady flow effects", Mechanisms, Transmissions and Applications  Proceedings of the Third MeTrApp Conference 2015, pp. 324227, 2015  
2014  


Osman, M., Sauer, R.A.: "Quasistatic analysis of selfcleaning surface mechanisms", Proc. 22nd UK Conference on Computational Mechanics (ACME2014), pp. 324227, 2014, pdf  
2013  


Rasool, R., Osman, M., Sauer, R.A.: "Computational modeling of liquid droplets moving on rough surfaces", Proc. Appl. Math. Mech. 13, pp. 233234, 2013  
2012  


Rasool, R., Sauer, R.A., Osman, M.: "Internal flow analysis for slow moving small droplets in contact with hydrophobic surfaces", Proc. Appl. Math. Mech. 12, pp. 489490, 2012  
2011  


Osman, M., Sauer, R.A.: "A twodimensional computational droplet contact model", Proc. Appl. Math. Mech. 11, pp. 103104, 2011  
2010  


Osman, M., Sauer, R.A.: "Mechanical modeling of particledroplet interaction motivated by the study of selfcleaning mechanisms", Proc. Appl. Math. Mech. 10(1), pp. 8586, 2010  
2009  


Sauer, R.A.: "A computational contact model for nanoscale rubber adhesion", Constitutive Models for Rubber VI, G. Heinrich et al. (Eds.), pp. 4752, 2009, pdf  


Sauer, R.A.: "A threedimensional multiscale finite element model describing the adhesion of a gecko seta", Proc. Appl. Math. Mech. 9, pp. 157158, 2009  
2008  


Sauer, R.A.: "A finite element seta model for studying gecko adhesion", ASME Conf. Proc., IMECE200867193, pp. 149150, 2008  


Sauer, R.A.: "An atomic interactionbased rod formulation for modeling gecko adhesion", Proc. Appl. Math. Mech. 8, pp. 1019310194, 2008  
2007  


Sauer, R.A., Li, S.: "An atomic interactionbased continuum model for computational multiscale contact mechanics", Proc. Appl. Math. Mech. 7, pp. 40800294080030, 2007  
2006  


Sauer, R.A.: "An atomic interactionbased continuum model for computational multiscale contact mechanics", Dissertation, University of California at Berkeley, 2006  
2003  


Sauer, R.A.: "The 2D finite Eshelby tensor for a circular inclusion", Master thesis, University of California at Berkeley, 2003  
2002  


Sauer, R.A.: "Development and numerical implementation of a threedimensional elastoplastic model for the computation of concrete structures", Diplomarbeit, University of Karlsruhe, Germany, 2002 