research
Ventilated acoustic metamaterial window panels for simultaneous noise shielding and air circulation
The conflict between the acoustical performance and ventilation efficiency in conventional noise barriers limits their application potentials in several settings. To address this challenge, we design and experimentally demonstrate a ventilated tunable acoustic metamaterial for noise mitigation at targeted frequencies. Through the structure, a peak normal incidence sound absorption coefficient of more than 0.96 at 1000 Hz and the peak normal incidence sound transmission loss of 18 dB is achieved while maintaining the air circulation with a 45% open area of ventilation.
3D printed Polyurethane : Viscoelastic experimental characterization and computational modelling
Digital Light Synthesis (DLS) technology creates ample opportunities for making 3D printed soft polymers for a wide range of grades and properties. In DLS, a 3D printer uses a continuous building technique in which the curing process is activated by an ultra-violet (UV) light. In this contribution, EUP40, a recently invented commercially available elastomeric polyurethane (EPU) printed by the DLS technology, is experimentally characterized.
MicroStructPy: Generation of statistically representative microstructures with direct grain geometry control
I would like to share an article that was recently published in CMAME.
It is about MicroStructPy, a very flexible microstructure generator able to represent various statistics for microstructures with multiple phases. It works in 2D and 3D and you can provide, for each phase, grain size distributions, volume fraction, elongation and orientation distribution for elongated grains, etc.
A residual stiffness-based model for the fatigue damage of biological soft tissues
Biologically-derived and chemically-treated collagenous tissues such as glutaraldehyde-treated bovine pericardium (GLBP) are widely used in many medical applications. The long-term cyclic loading-induced tissue fatigue damage has been identified as one of the primary factors limiting the durability of such medical devices and an in-depth understanding of the fatigue behaviors of biological tissues is critical to increase device durability.
Models for peristaltic locomotion in soft robots and worms
Dear Colleague,
I'm pleased to announce the latest paper from my research group (coauthored with Evan Hemingway (PhD 2020)):
Continuous models for peristaltic locomotion with application to worms and soft robots
has just been published in Biomechanics and Modeling in Mechanobiology. Here's a simulation of the model:
A Constitutive Model for Binary-Solvent Gels
Jie Ma, Zheng Jia*, Shaoxing Qu, A constitutive model for binary-solvent gels, Journal of Applied Mechanics, 87(8), 081010 (2020)
Thermodynamics 2.0 Conference Presentation
Here is a Youtube video link to my recent lecture on the Unification of Newton's Laws and Thermodynamics' Laws at the Thermodynamics 2.0 Conference on June 22-24, 2020.