Sacrificial bonds and hidden length mechanisms are leveraged by many biological systems for enhanced ductility and toughness. in a series of previous papers we modeled this mechanism at the level of collagen fibrils:
http://publish.illinois.edu/mcslabuiuc/files/2017/12/2013-Elbanna-Carlson.pdf
http://publish.illinois.edu/mcslabuiuc/files/2017/12/2013-Lieou-Elbanna-Carlson.pdf
Abstract: Shear banding is widely observed in natural fault zones as well as in laboratory experiments on granular materials. Understanding the dynamics of strain localization under different loading conditions is essential for quantifying strength evolution of fault gouge and energy partitioning during earthquakes and characterizing rheological transitions and fault zone structure changes. To that end, we develop a physics-based continuum model for strain localization in sheared granular materials.
On the Role of the Plaque Porous Structure in Mussel Adhesion: Implications for Adhesion Control Using Bulk Patterning
Ahmed Ghareeb and Ahmed Elbanna -- Journal of Applied Mechanics (2018)
Mechanical Response of Two Dimensional Polymer Networks: Role of Topology, Rate Dependence, and Damage Accumulation
In this paper we highlight several interesting phenomena that may emerge from coupling simple elastic systems like 1d bars. While in compostes we usually focus on wave propagation normal to the stratification direction (composite layers are coupled in series), here we show that extreme attenuation at multiple frequencies may emerge in linear systems that are coupled transversaly. We also introduce a simple device that act as a chopper for mechanical signals.
Dear Colleagues,
We cordially invite you to submit an abstract to 1702 Computational Geophysics; a minisymposium that will take place as part of the upcoming 13th World Congress on Computational Mechanics (New York July 22- July 27, 2018) : http://www.wccm2018.org/MS_1702
Abstract Deadline: Dec 31st, 2017
Dear Colleagues,
We cordially invite you to submit an abstract to MS 335: Friction, Fracture, and Damage; a minisymposium that will take place as part of the upcoming US National Congress on Theoretical and Applied Mechanics (Chicago, IL June 4th -9 th 2018). Abstract Deadline: Nov 10th :http://sites.northwestern.edu/usnctam2018/
Ahmed Elbanna, University of Illinois Urbana Champaign
Krishnaswamy Ravi-Chandar, University of Texas at Austin
The Finite Difference (FD) and the Spectral Boundary Integral (SBI) methods have been used extensively to model spontaneously propagating shear cracks in a variety of engineering and geophysical applications. In this paper, we propose a new modeling approach, in which these two methods are combined through consistent exchange of boundary tractions and displacements. Benefiting from the flexibility of FD and the efficiency of spectral boundary integral methods, the proposed hybrid scheme will solve a wide range of problems in a computationally efficient way.
Shear banding and stick-slip instabilities have been long observed in sheared granular materials. Yet, their microscopic underpinnings, interdependencies and variability under different loading conditions have not been fully explored. Here, we use a non-equilibrium thermodynamics model, the Shear Transformation Zone theory, to investigate the dynamics of strain localization and its connection to stability of sliding in sheared, dry, granular materials. We consider frictional and frictionless grains as well as presence and absence of acoustic vibrations.
