@article{pearson_gao_zikry_harrison_2009, title={Nanoindentation of model diamond nanocomposites: Hierarchical molecular dynamics and finite-element simulations}, volume={47}, ISSN={["1879-0801"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-70449134804&partnerID=MN8TOARS}, DOI={10.1016/j.commatsci.2009.06.007}, abstractNote={Complementary molecular dynamics (MD) and finite-element (FE) simulations of model diamond nanocomposites (MDN) subjected to nanoindentation were undertaken to understand how contact behavior pertaining to the surface morphology of MDN surfaces can be spanned from the molecular to the continuum scale. The MD simulations determined that the behavior inside the contact region is influenced by atomic-scale features on the tip and surface, indent location, grain tilt and roughness of the MDN surfaces. In addition, if the atomic-scale surface morphology is treated as a surface roughness within the FE simulations, the same grain orientations, and similar elastic properties are used for both MD and FE simulations, there is reasonable agreement between the contact pressures for relatively low indentation loads and shallow substrates. For larger loads, the contact pressures from the FE simulations deviate somewhat from the MD results near the center of the contact. The contact behavior for length scales that are prohibitive for MD models (e.g., deep substrates) was also examined using FE simulations. This allowed for a detailed investigation of how contact conditions and stick-slip events within the contact evolve as a function of contact pressure and continuum surface stresses.}, number={1}, journal={COMPUTATIONAL MATERIALS SCIENCE}, author={Pearson, James D. and Gao, Guangtu and Zikry, Mohammed A. and Harrison, Judith A.}, year={2009}, month={Nov}, pages={1–11} }
 @article{prabhugoud_peters_pearson_zikry_2007, title={Independent measurement of strain and sensor failure features in Bragg grating sensors through multiple mode coupling}, volume={135}, ISSN={["0924-4247"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-34047170478&partnerID=MN8TOARS}, DOI={10.1016/j.sna.2006.08.021}, abstractNote={This article presents the interrelated measurements of Bragg reflection, cladding and radiation modes to obtain the applied strain and integrity of a short period Bragg grating sensor. While the Bragg reflection is known to be sensitive to applied strain, the relative strength of the cladding and radiation mode coupling is shown to be sensitive to damage such as debonding from the host structure. Furthermore, the length of the Bragg grating debonded from the surrounding medium is quantitatively related to the coupling to continuum radiation modes from the core mode. While the sensitivity of the radiation mode coupling to microcracking in the optical fiber is shown to be relatively low, maximum intensity measurements provide sufficient information on local fractures of the optical fiber. These results provide intelligent self-diagnostic capabilities within the Bragg grating sensor without additional measurements, and also permit the separate identification of sensor failure from the failure of the host structure.}, number={2}, journal={SENSORS AND ACTUATORS A-PHYSICAL}, author={Prabhugoud, Mohanraj and Peters, Kara and Pearson, James and Zikry, Mohammed A.}, year={2007}, month={Apr}, pages={433–442} }