Ali Javili

All Publications

• General imperfect interfaces COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING Javili, A., Kaessmair, S., Steinmann, P. 2014; 275: 76-97

  View details for DOI 10.1016/j.cma.2014.02.022

  View details for Web of Science ID 000336346700005

• Surface electrostatics: theory and computations PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES Chatzigeorgiou, G., Javili, A., Steinmann, P. 2014; 470 (2164)

  View details for DOI 10.1098/rspa.2013.0628

  View details for Web of Science ID 000332394400008

• Geometrically nonlinear higher-gradient elasticity with energetic boundaries JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS Javili, A., Dell'Isola, F., Steinmann, P. 2013; 61 (12): 2381-2401

  View details for DOI 10.1016/j.jmps.2013.06.005

  View details for Web of Science ID 000326660400001

• Computational homogenization in magneto-mechanics INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES Javili, A., Chatzigeorgiou, G., Steinmann, P. 2013; 50 (25-26): 4197-4216

  View details for DOI 10.1016/j.ijsolstr.2013.08.024

  View details for Web of Science ID 000326666000006

• Thermomechanics of Solids With Lower-Dimensional Energetics: On the Importance of Surface, Interface, and Curve Structures at the Nanoscale. A Unifying Review APPLIED MECHANICS REVIEWS Javili, A., McBride, A., Steinmann, P. 2013; 65 (1)

  View details for DOI 10.1115/1.4023012

  View details for Web of Science ID 000329611700002

• Highly-conductive energetic coherent interfaces subject to in-plane degradation MATHEMATICS AND MECHANICS OF SOLIDS Esmaeili, A., Javili, A., Steinmann, P. 2017; 22 (8): 1696-1716

  View details for DOI 10.1177/1081286516642818

  View details for Web of Science ID 000407176200004

• Computational aspects of morphological instabilities using isogeometric analysis COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING Dortdivanlioglu, B., Javili, A., Linder, C. 2017; 316: 261-279

  View details for DOI 10.1016/j.cma.2016.06.028

  View details for Web of Science ID 000395952500012

• Elastosis during airway wall remodeling explains multiple co-existing instability patterns JOURNAL OF THEORETICAL BIOLOGY Eskandari, M., Javili, A., Kuhl, E. 2016; 403: 209-218

  Abstract

  Living structures can undergo morphological changes in response to growth and alterations in microstructural properties in response to remodeling. From a biological perspective, airway wall inflammation and airway elastosis are classical hallmarks of growth and remodeling during chronic lung disease. From a mechanical point of view, growth and remodeling trigger mechanical instabilities that result in inward folding and airway obstruction. While previous analytical and computational studies have focused on identifying the critical parameters at the onset of folding, few have considered the post-buckling behavior. All prior studies assume constant microstructural properties during the folding process; yet, clinical studies now reveal progressive airway elastosis, the degeneration of elastic fibers associated with a gradual stiffening of the inner layer. Here, we explore the influence of temporally evolving material properties on the post-bifurcation behavior of the airway wall. We show that a growing and stiffening inner layer triggers an additional subsequent bifurcation after the first instability occurs. Evolving material stiffnesses provoke failure modes with multiple co-existing wavelengths, associated with the superposition of larger folds evolving on top of the initial smaller folds. This phenomenon is exclusive to material stiffening and conceptually different from the phenomenon of period doubling observed in constant-stiffness growth. Our study suggests that the clinically observed multiple wavelengths in diseased airways are a result of gradual airway wall stiffening. While our evolving material properties are inspired by the clinical phenomenon of airway elastosis, the underlying concept is broadly applicable to other types of remodeling including aneurysm formation or brain folding.

  View details for DOI 10.1016/j.jtbi.2016.05.022

  View details for Web of Science ID 000378987100019

  View details for PubMedID 27211101

• An algorithmic approach to multi-layer wrinkling EXTREME MECHANICS LETTERS Lejeune, E., Javili, A., Linder, C. 2016; 7: 10-17

  View details for DOI 10.1016/j.eml.2016.02.008

  View details for Web of Science ID 000395256900002

• Understanding geometric instabilities in thin films via a multi-layer model. Soft matter Lejeune, E., Javili, A., Linder, C. 2016; 12 (3): 806-816

  Abstract

  When a thin stiff film adhered to a compliant substrate is subject to compressive stresses, the film will experience a geometric instability and buckle out of plane. For high film/substrate stiffness ratios with relatively low levels of strain, the primary mode of instability will either be wrinkling or buckling delamination depending on the material and geometric properties of the system. Previous works approach these systems by treating the film and substrate as homogenous layers, either consistently perfectly attached, or perfectly unattached at interfacial flaws. However, this approach neglects systems where the film and substrate are uniformly weakly attached or where interfacial layers due to surface modifications in either the film or substrate are present. Here we demonstrate a method for accounting for these additional thin surface layers via an analytical solution verified by numerical results. The main outcome of this work is an improved understanding of how these layers influence global behavior. We demonstrate the utility of our model with applications ranging from buckling based metrology in ultrathin films, to an improved understanding of the formation of a novel surface in carbon nanotube bio-interface films. Moving forward, this model can be used to interpret experimental results, particularly for systems which deviate from traditional behavior, and aid in the evaluation and design of future film/substrate systems.

  View details for DOI 10.1039/c5sm02082d

  View details for PubMedID 26536391

• Tri-layer wrinkling as a mechanism for anchoring center initiation in the developing cerebellum SOFT MATTER Lejeune, E., Javili, A., Weickenmeier, J., Kuhl, E., Linder, C. 2016; 12 (25): 5613-5620

  Abstract

  During cerebellar development, anchoring centers form at the base of each fissure and remain fixed in place while the rest of the cerebellum grows outward. Cerebellar foliation has been extensively studied; yet, the mechanisms that control anchoring center initiation and position remain insufficiently understood. Here we show that a tri-layer model can predict surface wrinkling as a potential mechanism to explain anchoring center initiation and position. Motivated by the cerebellar microstructure, we model the developing cerebellum as a tri-layer system with an external molecular layer and an internal granular layer of similar stiffness and a significantly softer intermediate Purkinje cell layer. Including a weak intermediate layer proves key to predicting surface morphogenesis, even at low stiffness contrasts between the top and bottom layers. The proposed tri-layer model provides insight into the hierarchical formation of anchoring centers and establishes an essential missing link between gene expression and evolution of shape.

  View details for DOI 10.1039/c6sm00526h

  View details for Web of Science ID 000378935000013

  View details for PubMedID 27252048

• Computational aspects of growth-induced instabilities through eigenvalue analysis COMPUTATIONAL MECHANICS Javili, A., Dortdivanlioglu, B., Kuhl, E., Linder, C. 2015; 56 (3): 405-420

  View details for DOI 10.1007/s00466-015-1178-6

  View details for Web of Science ID 000359381500002

• A unified computational framework for bulk and surface elasticity theory: a curvilinear-coordinate-based finite element methodology COMPUTATIONAL MECHANICS Javili, A., McBride, A., Steinmann, P., Reddy, B. D. 2014; 54 (3): 745-762

  View details for DOI 10.1007/s00466-014-1030-4

  View details for Web of Science ID 000340535400011

• Unified magnetomechanical homogenization framework with application to magnetorheological elastomers MATHEMATICS AND MECHANICS OF SOLIDS Chatzigeorgiou, G., Javili, A., Steinmann, P. 2014; 19 (2): 193-211

  View details for DOI 10.1177/1081286512458109

  View details for Web of Science ID 000333236100005

• A novel strategy to identify the critical conditions for growth-induced instabilities JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS Javili, A., Steinmann, P., Kuhl, E. 2014; 29: 20-32

  Abstract

  Geometric instabilities in living structures can be critical for healthy biological function, and abnormal buckling, folding, or wrinkling patterns are often important indicators of disease. Mathematical models typically attribute these instabilities to differential growth, and characterize them using the concept of fictitious configurations. This kinematic approach toward growth-induced instabilities is based on the multiplicative decomposition of the total deformation gradient into a reversible elastic part and an irreversible growth part. While this generic concept is generally accepted and well established today, the critical conditions for the formation of growth-induced instabilities remain elusive and poorly understood. Here we propose a novel strategy for the stability analysis of growing structures motivated by the idea of replacing growth by prestress. Conceptually speaking, we kinematically map the stress-free grown configuration onto a prestressed initial configuration. This allows us to adopt a classical infinitesimal stability analysis to identify critical material parameter ranges beyond which growth-induced instabilities may occur. We illustrate the proposed concept by a series of numerical examples using the finite element method. Understanding the critical conditions for growth-induced instabilities may have immediate applications in plastic and reconstructive surgery, asthma, obstructive sleep apnoea, and brain development.

  View details for DOI 10.1016/j.jmbbm.2013.08.017

  View details for Web of Science ID 000330085700003

  View details for PubMedID 24041754

• Micro-to-macro transitions for continua with surface structure at the microscale INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES Javili, A., McBride, A., Mergheim, J., Steinmann, P., Schmidt, U. 2013; 50 (16-17): 2561-2572

  View details for DOI 10.1016/j.ijsolstr.2013.03.022

  View details for Web of Science ID 000320685900002

• On molecular statics and surface-enhanced continuum modeling of nano-structures COMPUTATIONAL MATERIALS SCIENCE Davydov, D., Javili, A., Steinmann, P. 2013; 69: 510-519

  View details for DOI 10.1016/j.commatsci.2012.11.053

  View details for Web of Science ID 000314933900062

• Numerical modelling of thermomechanical solids with highly conductive energetic interfaces INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING Javili, A., McBride, A., Steinmann, P. 2013; 93 (5): 551-574

  View details for DOI 10.1002/nme.4402

  View details for Web of Science ID 000313613700005

• Numerical modelling of thermomechanical solids with mechanically energetic (generalised) Kapitza interfaces COMPUTATIONAL MATERIALS SCIENCE Javili, A., McBride, A., Steinmann, P. 2012; 65: 542-551

  View details for DOI 10.1016/j.commatsci.2012.06.006

  View details for Web of Science ID 000310357400074

• Micro-to-macro transitions for heterogeneous material layers accounting for in-plane stretch JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS McBride, A., Mergheim, J., Javili, A., Steinmann, P., Bargmann, S. 2012; 60 (6): 1221-1239

  View details for DOI 10.1016/j.jmps.2012.01.003

  View details for Web of Science ID 000303285600010

• A deformational and configurational framework for geometrically non-linear continuum thermomechanics coupled to diffusion INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS Steinmann, P., McBride, A. T., Bargmann, S., Javili, A. 2012; 47 (2): 215-227

  View details for DOI 10.1016/j.ijnonlinmec.2011.05.009

  View details for Web of Science ID 000302981100017

• Relationships between the admissible range of surface material parameters and stability of linearly elastic bodies PHILOSOPHICAL MAGAZINE Javili, A., McBride, A., Steinmann, P., REDDY, B. D. 2012; 92 (28-30): 3540-3563

  View details for DOI 10.1080/14786435.2012.682175

  View details for Web of Science ID 000310136500010

• Geometrically nonlinear continuum thermomechanics with surface energies coupled to diffusion JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS McBride, A. T., Javili, A., Steinmann, P., Bargmann, S. 2011; 59 (10): 2116-2133

  View details for DOI 10.1016/j.jmps.2011.06.002

  View details for Web of Science ID 000295549500010

• A finite element framework for continua with boundary energies. Part III: The thermomechanical case COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING Javili, A., Steinmann, P. 2011; 200 (21-22): 1963-1977

  View details for DOI 10.1016/j.cma.2010.12.013

  View details for Web of Science ID 000290842600015

• On thermomechanical solids with boundary structures INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES Javili, A., Steinmann, P. 2010; 47 (24): 3245-3253

  View details for DOI 10.1016/j.ijsolstr.2010.08.009

  View details for Web of Science ID 000283604800003

• A finite element framework for continua with boundary energies. Part II: The three-dimensional case COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING Javili, A., Steinmann, P. 2010; 199 (9-12): 755-765

  View details for DOI 10.1016/j.cma.2009.11.003

  View details for Web of Science ID 000274572600026

• A finite element framework for continua with boundary energies. Part I: The two-dimensional case COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING Javili, A., Steinmann, P. 2009; 198 (27-29): 2198-2208

  View details for DOI 10.1016/j.cma.2009.02.008

  View details for Web of Science ID 000266297300013

• The two-dimensional laminar wall jet. Velocity measurements compared with similarity theory FORSCHUNG IM INGENIEURWESEN-ENGINEERING RESEARCH Peters, F., Ruppel, C., Javili, A., Kunkel, T. 2008; 72 (1): 19-28

  View details for DOI 10.1007/s10010-007-0064-6

  View details for Web of Science ID 000254578200003