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Dr. Pedro  Peralta  Md image

Dr. Pedro Peralta Md

100 E Le Fevre Rd
Sterling IL 61081
815 250-0400
Medical School: Other - Unknown
Accepts Medicare: No
Participates In eRX: No
Participates In PQRS: No
Participates In EHR: No
License #:
NPI: 1619929387
Taxonomy Codes:
207P00000X

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Superhard nanobuttons: constraining crystal plasticity and dealing with extrinsic effects at the nanoscale. - Small (Weinheim an der Bergstrasse, Germany)
The compressive plastic strength of nanosized single-crystal metallic pillars is known to depend on their diameter D. Herein, the role of pillar height h is analyzed instead, and the suppression of the generalized crystal plasticity below a critical value h(CR) is observed. Novel in situ compression tests on regular pillars as well as nanobuttons, that is, pillars with h < h(CR), show that the latter are much harder, withstanding stresses >2 GPa. A statistical model that holds for both pillars and buttons is formulated. Owing to their superhard nature, the nanobuttons examined here underline with unprecedented resolution the extrinsic effects-often overlooked-that naturally arise during testing when the Saint-Venant assumption ceases to be accurate. The bias related to such effects is identified in the test data and removed when possible. Finally, continuous hardening is observed to occur under increasing stress level, in analogy to reports on nanoparticles. From a metrological standpoint the results expose some difficulties in nanoscale testing related to current methodology and technology. The implications of the analysis of extrinsic effects go beyond nanobuttons and extend to nano-/microelectromechanical system design and nanomechanics in general.

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100 E Le Fevre Rd Sterling, IL 61081
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