Zheng Jia's blog

This course presents an introduction to mechanics, instructed by Prof. Wei YANG at Zhejiang University, a leading scientist in solid mechanics. Mechanics is the science concerning force, motion, and deformation, studying the macroscopic and microscopic mechanical behaviors of complex matters in nature and engineering.

A postdoctoral position is available in Dr. Zheng Jia’s group in the Department of Engineering Mechanics at Zhejiang University, China.

Description

(1) Design, synthesis, and characterization of functional hydrogels;

(2) Supervision of graduate students.

Job requirements

(1) PhD degree in Mechanical/Material Science/Chemical Engineering or related fields;

Jian Cheng, Zheng Jia*, Teng Li*, A constitutive model of microfiber reinforced anisotropic hydrogels: with applications to wood-based hydrogels, Journal of the Mechanics and Physics of Solids, 138 (2020) 103893 (DOI: https://doi.org/10.1016/j.jmps.2020.103893)

Burebi Yiming, Lei Wu, Mingqi Zhang, Zilong Han, Pei Zhao, Tiefeng Li, Zheng Jia*, Shaoxing Qu, Highly Stretchable Bilayer Lattice Structures that Elongate via in-Plane Deformation, Advanced Functional Materials, 2020, 1909473 (DOI: https://doi.org/10.1002/adfm.201909473)

In this study, we developed a micromechanical model for the growth and remodeling of a soft tissue based on the concurrent action of collagen deposition and degradation. We assumed in the model that collagen degradation causes a reduction in the fiber radius, while collagen deposition can increase both the radius and length of the collagen fibers growing under load. The latter arises from the assumption that collagen is deposited in an unstressed state, which increases the reference length of a fiber growing under mechanical load.

The stretchability of metal materials is often limited by the onset and development of necking instability. For instance, necking of lithium metal often occurs at low strains and thus hinders its practical applications in stretchable lithium batteries. Substrate/metal bilayers are emerging as a promising solution to the stringent stretchability requirement of metal electrodes and current collectors in flexible and stretchable batteries.

Nemo lives in the ocean near the Great Barrier Reef. One day, he bought a hydrogel balloon which is inflated by an inner pressure p. Will the balloon burst eventually or stay safe?

Zheng Jia, Wing Kam Liu, Rate-dependent stress evolution in nanostructured Si anodes upon lithiation, Applied Physics Letters, 109, 163903 (2016) (DOI:http://dx.doi.org/10.1063/1.4964515)

Confirmed invited speakers:

Sheldon Brian (Brown University)

Sulin Zhang (Penn State University)

Ting Zhu (Georgia Institute of Technology)

Matt Pharr (UIUC)

Shuman Xia (Georgia Institute of Technology)

Vivek Shenoy (University of Pennsylvania)

Wayne Chen (Purdue University)

Yue Qi (Michigan State University)

Yuefei Zhang (Beijing University of Technology)

Shengping Shen (Xi'an Jiaotong University)