research

I would like to share our following paper published recently in International Journal of Plasticity:

Modeling and simulation of dynamic compression of Bulk Metallic Glasses at room and elevated temperatures using split Hopkinson pressure bar setup

Our recent paper is accessible freely for 50 days from this link: https://authors.elsevier.com/a/1iaz87NHxQgzz

Key findings of this paper include a 7-fold strength increase in crystals with chain ends at higher strain rates, a shift in failure mode from chain end sliding to chain scission, and the influence of molecular weight on the failure mode.

The problem of the detachment of a flat indenter from a plane adhesive viscoelastic strip of thickness “b” is studied. For any given retraction speed, three different detachment regimes are found: (i) for very small “b” the detachment stress is constant and equal to the theoretical strength of the interface, (ii) for intermediate values of “b” the detachment stress decays approximately as b^{-1/2}1/2, (iii) for thick layers a constant detachment stress is obtained corresponding to case the punch is detaching from a halfplane.

If you have NSF-funded projects, please encourage your students to submit posters to ASME IMECE topic 16-1 and 16-2 (REU only)! NSF provides 30+ travel awards ($1200 each) to cover student travel cost, plus chances to win poster competition awards.

Journal Club for February 2024: Mechanics in Solid-State Batteries: Mechanical Properties, Interfacial Failure, and Multiphysics Modeling

Wei Li⁼, Ruqing Fang⁼, Junning Jiao, Juner Zhu*

Department of Mechanical and Industrial Engineering, Northeastern University

* Corresponding author: j.zhu [at] northeastern.edu
= Authors with equal contributions to this article

By considering the frictional sliding of randomly distributed entanglements within the polymer network upon mechanical stretches, we develop a constitutive theory to describe the large stretch behaviors of highly entangled hydrogels. 

doi: https://doi.org/10.1007/s10483-024-3076-8

Solidification phenomenon has been an integral part of the manufacturing processes of metals, where the quantification ofstochastic variations and manufacturing uncertainties is critically important. Accurate molecular dynamics (MD) simulations ofmetal solidification and the resulting properties require excessive computational expenses for probabilistic stochastic analyseswhere thousands of random realizations are necessary.

This paper provides a brief review on modeling of composite structures. Composite structures in this paper refer to any structure featuring anisotropy and heterogeneity, including but not limited to their traditional meaning of composite laminates made of unidirectional fiber-reinforced composites. Common methods used in modeling of composite structures, including the axiomatic method, the formal asymptotic method, and the variational asymptotic method, are illustrated in deriving the classical lamination theory for the composite laminated plates to see their commonalities and differences.