Biomechanics

Our research focuses on the biomechanics of bone-periodontal ligament (PDL)-tooth and bone-implant structures. The in situ biomechanical testings coupled with micro X-Ray computed tomography (CT) provided information on the relative motion of teeth/implants inside the alveolar sockets and the bone-implant contact induced strain in alveolar bone. These results provided insights to commonly observed clinical complications and improvements in surgical planning and techniques.

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Bioinspired Design

The growing market drives the high demand for dental crowns restorations that are more resistant to cracking. A combination of contact and fracture mechanics models was used to develop the bio-inspired design of dental multilayers. Inspired by the cracking resistance of the natural teeth, we designed and fabricated functionally graded multilayered crown structures. The cracking loads in the bio-inspred structures were found to be ~30% greater than those in the conventional layered structures.

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Biomedical Devices

Cardiovascular disease is the biggest cause of death worldwide. Coronary stents are small structures that can keep arteries open in the treatment of coronary heart disease. To design robust drug-eluting stents satisfying FDA guidance, my research explored new ways of characterizing and modeling the adhesion of polymeric drug-containing coatings to metallic substrates.

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Electronic Devices

We studied the effects of adhesion and contact for the optimization of fabrication processes for the next generation of organic electronics. Mechanical properties of the soft and hard materials that are relevant to solar cells as well as organic light emitting diodes (OLEDs) were characterized and incorporated into our models. The insights from our models were used to guide the successful design of pressure-assisted fabrication techniques. The current-voltage characterization of the fabricated devices showed major improvement in the operating conditions.

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Nanomechanics

We applied finite element method to the nano-scale mechanics behaviors of atoms. A bonding element was developed to describe the mechanical behaviors of chemical bonds. The results are comparable with that of Raman and infrared spectrum experiments. By using this special element, the finite element method, which was usually used in the area of continuum mechanics, was proved to be applicable in atomic scale calculations and to be able to generate discrete results. More animations

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