کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7170662 | 1463292 | 2018 | 20 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Design of piezoMEMS for high strain rate nanomechanical experiments
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
مهندسی انرژی و فناوری های برق
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Nanomechanical experiments on 1-D and 2-D materials are typically conducted at quasi-static strain rates of 10â4/s, while their analysis using molecular dynamic (MD) simulations are conducted at ultra-high strain rates of 106/s and above. This large order of magnitude difference in the strain rates prevents a direct one-on-one comparison between experiments and simulations. In order to close this gap in strain rates, nanoscale actuation/sensing options were explored to increase the experimental strain rates. Using a combination of COMSOL multiphysics finite element simulations and experiments, it is shown that thermal actuation, which uses structural expansion due to Joule heating, is capable of executing uniaxial nanomechanical testing up to a strain rate of 100/s. The limitation arises from system inertia and thermal transients. In contrast, piezoelectric actuation can respond in the GHz frequency range. However, given that the piezoelectric displacement is limited in range, a sagittal displacement amplification scheme is examined in the actuator design, which imposes a lower frequency limit for operation. Through a combination of analytical calculations and COMSOL dynamic analysis, it is shown that a piezoelectric actuator along with a displacement amplifier is capable of achieving ultra-high strain rates of â¼106/s during nanomechanical testing.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Extreme Mechanics Letters - Volume 20, April 2018, Pages 14-20
Journal: Extreme Mechanics Letters - Volume 20, April 2018, Pages 14-20
نویسندگان
Rajaprakash Ramachandramoorthy, Massimiliano Milan, Zhaowen Lin, Susan Trolier-McKinstry, Alberto Corigliano, Horacio Espinosa,