research interests

Mechanics of Hierarchical Materials

Our work combines experimental and theoretical approaches that rely on strong foundations in mechanics of solids and materials science. One exciting thrust area has been the design of so-called hierarchical microstructures for light-weight structural materials (e.g. nano-micro aluminum composites).

 

 

 

 

 

 

 

 

 

 

Nano-micro Aluminum alloy composites

[with K.T. Ramesh (JHU), Y.S. Suh (Hannam Unversity, Korea)]

 

Rate-Dependent Behavior of Advanced Materials

We can understand a good bit about the mechanical behavior of materials by deforming them at various length scales (microns to mm) and over strain rates ranging from gentle (~ 10^-4 s^-1) to very high (~10³-10⁴ s^-1). These are often combined with in-situ imaging (e.g. image correlation, high speed photography) to improve our understanding of the deformation processes.

 

 

 

 

 

 

 

 

 

 

 

Rate-dependent constitutive response of fine-grained Magensium alloy (ZK60)

[with K.T. Ramesh, En Ma, Bin Li (JHU)]

 

Deformation Instabilities in Advanced Materials and Systems

Our interest is in understanding the microstructural processes that cause failure of materials. More generally, the interest is in understanding instabilities that develop in a variety of material systems during deformation, over various length and time scales. To do so, we must identify the underlying mechanics and physics, so that these materials and systems will not fail, or gracefully so, if at all. And the excitement does not end there. We could then turn the problem on its head and ask: are instabilities useful? Can we manipulate them? Can we employ them for novel applications? While experimental observations are generally the primary information sources, it is of utmost importance to develop a sound theoretical basis for the observed phenomena. A broad objective of our research is to provide this basis by coupling the underlying science into engineering through a mechanistic approach.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Evolution of Portevin-Le Chatelier bands in ultrafine-grained Al5083 using micro-tension with digital image correlation.

[with K.T. Ramesh, Buyang Cao, Kevin Hemker (JHU), and Chris Eberl (Uni-Karlruhe), ]

Grain-Size dependent stability of crystalline materials.

[with K.T. Ramesh (JHU)]     

PhD Applicants

Scholarships

SINGA

 

Announcement:

Potential Post-doctoral Position in Mechanics of Nanocrystalline Materials and Composites

 

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