Mechanically instructive biomaterials: a synergy of mechanics, materials and biology
Zhenwei Ma, Jianyu Li
Department of Mechanical Engineering, McGill University, Montreal, Canada
Sarthok. K. Baruah Sabyasachi Chatterjee Amit Acharya Gerald J. Wang
The application of molecular dynamics (MD) simulations to quasi-static loading is severely limited by the large separation between atomic vibration timescales and experimentally relevant deformation rates. In this work, we employ the Practical Time Averaging (PTA) framework to overcome this limitation and enable atomistic simulations of crystalline solids under quasi-static loading conditions. PTA exploits the intrinsic separation of time scales by defining slow variables as time-averaged observables of the fast atomistic dynamics and their evolution in the slow loading timescale, thereby avoiding explicit integration of the fast dynamics. Using this approach, we simulate uniaxial deformation, in both tension and compression, of (4 to 20) nanometer sized cubic specimens of face-centered cubic Aluminum nanocrystals and applied strain rates approaching quasi-static conditions (10^−4 s−1 − 10^−3 s−1).
GJR PUBLICATION & ICON PUBLISHERS - Journals for Publication
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The James T. Willerson Center for Cardiovascular Modeling and Simulation, Oden Institute, the University of Texas, has an immediate opening for highly motivated graduate research assistants to conduct novel studies on a novel family of gel-coated electrospun meshes for replacement heart valves.
Dear colleagues,
A few years ago, I shared here a short note on inflation-induced twist in geometrically incompatible isotropic tubes, exploring how layered cylindrical structures can develop torsion under pressure without externally applied torque:
https://www.imechanica.org/node/24506
I am pleased to share that this line of thinking has now evolved into a published study in npj Regenerative Medicine:
Dear colleagues, we are excited to announce that the ASME Journal of Vibrations and Acoustics (JVA) invites submissions for a special issue on Topological Mechanics: Exploiting Geometric Phase in Mechanical & Acoustic Waves.
Noe Reyes Rivas
Applied Mathematics, Brown University
Time: 11:00 am - 12:00 pm (EST), Feb. 05, Thursday
Zoom Meeting ID: 824 6447 8256
Passcode: 003801
Abstract
In this paper we formulate a geometric theory of elasticity and anelasticity for bodies containing material surfaces with their own elastic energies and distributed surface eigenstrains. Bulk elasticity is written in the language of Riemannian geometry, and the framework is extended to material surfaces by using the differential geometry of hypersurfaces in Riemannian manifolds.
Two-dimensional (2D) lattice materials with well-designed microstructures exhibit extraordinary properties such as zero and negative Poisson’s effects, and play a crucial role in industrial fields. However, inevitable defects from manufacturing, storage, transportation, and service may compromise their microstructures and functionalities. Therefore, it is important but still unclear: which microstructures and associated properties are most or least sensitive to defects.
Film-substrate systems are prevalent in various industries, and manipulation of their adhesion strength is essential to guarantee their desired functionalities. Inspired by the heterogeneous characteristic of geckos’ spatulae, heterogeneous adhesion devices are proposed for enhanced directional adhesion, but experimental measurements of their adhesion strength are significantly lower than the theoretical predictions. This discrepancy is likely due to the cohesive zone, a factor that was usually overlooked in previous theoretical models.
