173 citations · 1.4k across the 55 of their papers we have counts for
27 papers · 1 filter
Contact-based inverse analysis for nonlinear material identification in spatially heterogeneous solids
Bartłomiej Łazorczyk, Roger A. Sauer
This study presents a contact-based isogeometric Finite Element Model Updating (FEMU) framework for identifying spatially varying constitutive parameters of nonlinear solids. The f…
A coupled finite element formulation for chemo-mechano-thermodynamical contact and its application to bonding and debonding
Roger A. Sauer
This work presents a finite element formulation for coupled chemo-mechano-thermodynamical large deformation contact. The formulation is based on the contact theory of Sauer et al.…
Nonlinear elastodynamic material identification of heterogeneous isogeometric Bernoulli-Euler beams
Bartłomiej Łazorczyk, Roger A. Sauer
This paper presents a Finite Element Model Updating framework for identifying heterogeneous material distributions in planar Bernoulli-Euler beams based on a rotation-free isogeome…
A new rotation-free isogeometric thin shell formulation and a corresponding continuity constraint for patch boundaries
Thang Xuan Duong, Farshad Roohbakhshan, Roger Andrew Sauer
This paper presents a general non-linear computational formulation for rotation-free thin shells based on isogeometric finite elements. It is a displacement-based formulation that…
A finite strain model for fiber angle plasticity of textile fabrics based on isogeometric shell finite elements
Thang Xuan Duong, Roger Andrew Sauer
This work presents a shear elastoplasticity model for textile fabrics within the theoretical framework of anisotropic Kirchhoff-Love shells with bending of embedded fibers proposed…
Topology optimization of contact-aided compliant mechanisms for tracing multi-kink paths
Prabhat Kumar, Roger A Sauer, Anupam Saxena
This paper presents a topology optimization approach to design 2D contact-aided compliant mechanisms (CCMs) that can trace the desired output paths with more than one kink while ex…
A simple and efficient hybrid discretization approach to alleviate membrane locking in isogeometric thin shells
Roger A. Sauer, Zhihui Zou, Thomas J. R. Hughes
This work presents a new hybrid discretization approach to alleviate membrane locking in isogeometric finite element formulations for Kirchhoff-Love shells. The approach is simple,…
A new anisotropic bending model for nonlinear shells: Comparison with existing models and isogeometric finite element implementation
Eshwar J. Savitha, Roger A. Sauer
A new nonlinear hyperelastic bending model for shells formulated directly in surface form is presented, and compared to four prominently used bending models. Through an essential s…
An isogeometric finite element formulation for boundary and shell viscoelasticity based on a multiplicative surface deformation split
Karsten Paul, Roger A. Sauer
This work presents a numerical formulation to model isotropic viscoelastic material behavior for membranes and thin shells. The surface and the shell theory are formulated within a…
A general isogeometric finite element formulation for rotation-free shells with in-plane bending of embedded fibers
Thang Xuan Duong, Mikhail Itskov, Roger Andrew Sauer
This paper presents a general, nonlinear isogeometric finite element formulation for rotation-free shells with embedded fibers that captures anisotropy in stretching, shearing, twi…
Nonlinear material identification of heterogeneous isogeometric Kirchhoff-Love shells
Bartosz Borzeszkowski, Izabela Lubowiecka, Roger A. Sauer
This work presents a Finite Element Model Updating inverse methodology for reconstructing heterogeneous material distributions based on an efficient isogeometric shell formulation.…
A Bayesian regularization-backpropagation neural network model for peeling computations
Saipraneeth Gouravaraju, Jyotindra Narayan, Roger A. Sauer +1
Bayesian regularization-backpropagation neural network (BR-BPNN) model is employed to predict some aspects of the gecko spatula peeling viz. the variation of the maximum normal and…
On topology optimization of large deformation contact-aided shape morphing compliant mechanisms
Prabhat Kumar, Roger A. Sauer, Anupam Saxena
A topology optimization approach for designing large deformation contact-aided shape morphing compliant mechanisms is presented. Such mechanisms can be used in varying operating co…
Contact with coupled adhesion and friction: Computational framework, applications, and new insights
Janine C. Mergel, Julien Scheibert, Roger A. Sauer
Contact involving soft materials often combines dry adhesion, sliding friction, and large deformations. At the local level, these three aspects are rarely captured simultaneously,…
Isogeometric continuity constraints for multi-patch shells governed by fourth-order deformation and phase field models
Karsten Paul, Christopher Zimmermann, Thang X. Duong +1
This work presents numerical techniques to enforce continuity constraints on multi-patch surfaces for three distinct problem classes. The first involves structural analysis of thin…
An adaptive space-time phase field formulation for dynamic fracture of brittle shells based on LR NURBS
Karsten Paul, Christopher Zimmermann, Kranthi K. Mandadapu +3
We present an adaptive space-time phase field formulation for dynamic fracture of brittle shells. Their deformation is characterized by the Kirchhoff-Love thin shell theory using a…
A NURBS-based Inverse Analysis for Reconstruction of Nonlinear Deformations of Thin Shell Structures
N. Vu-Bac, T. X. Duong, T. Lahmer +4
This article presents original work combining a NURBS-based inverse analysis with both kinematic and constitutive nonlinearities to recover the applied loads and deformations of th…
A concise frictional contact formulation based on surface potentials and isogeometric discretization
Thang X. Duong, Roger A. Sauer
This work presents a concise theoretical and computational framework for the finite element formulation of frictional contact problems with arbitrarily large deformation and slidin…
Continuum contact models for coupled adhesion and friction
Janine C. Mergel, Riad Sahli, Julien Scheibert +1
We develop two new continuum contact models for coupled adhesion and friction, and discuss them in the context of existing models proposed in the literature. Our new models are abl…
A new efficient hyperelastic finite element model for graphene and its application to carbon nanotubes and nanocones
Reza Ghaffari, Roger A. Sauer
A new hyperelastic material model is proposed for graphene-based structures, such as graphene, carbon nanotubes (CNTs) and carbon nanocones (CNC). The proposed model is based on a…
Computational synthesis of large deformation compliant mechanisms undergoing self and mutual contact
Prabhat Kumar, Anupam Saxena, Roger A. Sauer
Topologies of large deformation Contact-aided Compliant Mechanisms (CCMs), with self and mutual contact, exemplified via path generation applications, are designed using the contin…
Modal analysis of graphene-based structures for large deformations, contact and material nonlinearities
Reza Ghaffari, Roger A. Sauer
The nonlinear frequencies of pre-stressed graphene-based structures, such as flat graphene sheets and carbon nanotubes, are calculated. These structures are modeled with a nonlinea…
A segmentation-free isogeometric extended mortar contact method
Thang Xuan Duong, Laura De Lorenzis, Roger A. Sauer
This paper presents a new isogeometric mortar contact formulation based on an extended finite element interpolation to capture physical pressure discontinuities at the contact boun…
Adaptive local surface refinement based on LR NURBS and its application to contact
Christopher Zimmermann, Roger A. Sauer
A novel adaptive local surface refinement technique based on Locally Refined Non-Uniform Rational B-Splines (LR NURBS) is presented. LR NURBS can model complex geometries exactly a…