Load Sensor Instability and Optimization of MEMS-based Tensile Testing Devices

Frontiers in Materials

Barbara Mazzolai¹  Benedetta Calusi¹  Horacio D. Espinosa²  Maria F. Pantano⁴  Nicola M. Pugno⁵ 

[1] Center for Micro-BioRobotics, Istituto Italiano di Tecnologia, Pontedera, Italy;Department of Mechanical Engineering, Northwestern University, Evanston, IL, United States;Ket-Lab, Fondazione E. Amaldi, Rome, Italy;Laboratory of Bio-inspired and Graphene Nanomechanics, Department of Civil, Environmental and Mechanical Engineering, University of Trento, Trento, Italy;School of Engineering and Materials Science, Queen Mary University of London, London, United Kingdom;

关键词: MEMS;    mechanical testing;    SEM/TEM;    instability;    nanomaterials;   

DOI  :  10.3389/fmats.2019.00161

来源: DOAJ

【 摘 要 】

MEMS-based tensile testing platforms are very powerful tools for the mechanical characterization of nanoscale materials, as they allow for testing of micro/nano-sized components in situ electron microscopes. In a typical configuration, they consist of an actuator, to deliver force/displacement, and a load sensor, which is connected to the sample like springs in series. Such configuration, while providing a high resolution force measurement, can cause the onset of instability phenomena, which can later compromise the test validity. In the present paper such phenomena are quantitatively discussed through the development of an analytical model, which allows to find a relationship between the rise of instability and the sensor stiffness, which is the key parameter to be optimized.

【 授权许可】

Unknown