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Yujie Wei's blog

Journal Club Theme of June 2015: Gradient structures for optimal mechanical design

The outmost surface of engineering materials typically faces the most severe risk of damage. When such boundary conditions are given, employment of graded structures is desired to enhance the safety of the structure in an economic way [1]. Mechanically, adopted gradient structures typically involves change in Young’s modulus or strength, and are beneficial to crack shielding, reducing stress concentration, retarding shear localization, etc.

Evading the strength-ductility trade-off dilemma in steel through gradient hierarchical nanotwins

It is a long-standing goal in metallurgy to enhance the strength of materials without sacrificing ductility. In a recent article in Nature Communications, we reported an effective way to evade the strength-ductility trade-off dilemma in twin-induced plasticity steel.

SES 50th anniversary annual technical meeting/ASME-AMD summer meeting at Brown (July 28-31, 2013)

The SES 50th anniversary annual technical meeting/ASME-AMD summer meeting will be
held at Brown July 28-31 next summer (2013). A complete list of symposia is posted
on the conference website at ,
which has links to an abstract for each symposium. The website is now open for
authors to submit abstracts.

Postdoc and Junior research scientist positions in composite materials and computational solid mechanics at CAS

Postdoc and Junior research scientist positions in composite materials (design, synthesis, and/or mechanical analysis) and computational solid mechanics at the Institute of Mechanics, Chinese Academy of Sciences

Candidates for the research scientist position should have hand on experience on synthsis of composite materials. Interested ones please send your resume to Dr. Yujie Wei via email:

The maximum receptor-ligand bond spacing to ensure cell adhesion in ligand-coated substrates

Recent experiments by Arnold et al. (ChemPhysChem, vol. 5, 2004, p383 ) revealed that a distance of less than 58-73 nm between receptor-ligand bonds is necessary to ensure focal adhesion in cells adhering to ligand-coated substrate. An elegant solution to this problem is supplied by Lin, Inamdar, and Freund.

Entropic-elasticity-controlled dissociation and energetic-elasticity-controlled rupture induce catch to slip bonds in cell-adhes

In order to achieve a wide variety of biological phenomena, the abilities of cells to contact effectively and interact specifically with neighboring media play a central role. It is known that cells can sense the chemical and mechanical properties of surrounding systems and regulate their adhesion and movement through binding protein molecules within cell membrane. The kinetics of binding molecules interacting with ligands is of great interest in biophysical society. There are lots of discussions and contributions on cell mechanics from our mechanical society, e.g.

Mechanics associated with grain-boundary diffusion and sliding in polycrystals and its application to nanocrystals

As stated by Richard Vinci and Oliver Kraft in the announcement of 2008 Gordon Research Conference on Thin Film and Small-Scale Mechanical Behavior, there is a compelling need to understand the critical roles of different deformation mechanisms in structures with small characteristic dimensions, like nanocrystals and thin films. We have recently studied deformation behaviors in nanostructured materials and thin films with deformation mechanisms including grain-boundary diffusion, grain-boundary sliding, and grain-interior plasticity. Some interesting mechanical phenomena associated with heterogeneous grain-boundary properties are found and summarized here.

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