In this project we investigate friction laws for single asperity contacts at nano- & micro- scales both theoretically and experimentally.

Scale Bridging in Nano and Micro Tribology

Micromechanics of Pseudo-Single-Asperity Friction

A new kind of frictional response, pseudo-single-asperity friction, has been studied using  LFM experiments. Nanometer-scale roughness was found to play significant roles for small scale friction.

A novel diamagnetic lateral force calibrator (D-LFC) has been  developed recently to directly calibrate AFM lateral force output without the complex interpretation of the intrinsic quantities. This device has the following features: high accuracy, easy, low cost and working for probes with any radii.

D-LFC: Lateral Force Calibration of AFM (LFM, FFM) 

In this project, nano- and micro- size metal pyramids are fabricated and used for studying the scale effect in the strength of solid surfaces under contact loading.

Nano and Micro Mechanics of Surface Plasticity

Our theory predicts that with a shallow chemical etching the roughness with spatial frequency below a critical value grows while the roughness of higher frequency decays. This study provides a simple experimental method to measure stress in metals and ceramics.

In this project, we study effects of nano-&micro size inclusions on the deformation characteristics of metal matrix composites.

In this project, nanometer-scale solid surface suspension and imprinting caused by high grafting density contacts and molecular interactions at the interface will be studied.

Mechanics of Multi-Scale Deformation in Nano- and Micro-Structural Metal-Matrix Composites

Surface Roughness Evolution Spectroscopy (SRES)

Nanomechanics of Solid Surface Suspension and Imprinting

Residual stresses in a complex structure are evaluated by an inverse finite element method utilizing the far-field displacements caused by sectioning the structure. The inverse method employs a partial polar decomposition of the stiffness matrix and associated regularizations.

Inverse Problems for Measuring Residual Stresses in

Complex Structures

In this project, we study the scale-dependent transition from a mechanism-based unit process to a statistically controlled process, commonly encountered in modeling nano and micro mechanics of adhesion, friction and fragmentation with bottom-up approaches.

Disorder Effects in Nano and Micro Mechanics of Adhesion, Friction and Fragmentation

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Strength characterization of Al/Si interfaces

A novel hybrid method of nanoindentation and finite element analysis is used to characterize the silicon particle indentation strength and the mechanical properties of Al/Si interfaces in an aluminum matrix composite.

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In this project, we study effects of a protein molecule, lubricin, in bio-tribology, using PFM experiments and modeling. In addition, we use a curvature interferometer to measure molecular and cellular surface interactions.

Mechanics of Molecular and Cellular Surface Interactions:
Friction and Adhesion

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We have developed an inverse method, filed projection method (FPM), to measure the crack-tip cohesive zone laws from the results of either atomistic simulations or high resolution transmission electron microscopy.

Field Projection Methods (FPM)

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