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DTSTAMP:20260612T232607Z
UID:https://www.mpie.de/events/21980/2768772
DTSTART:20191022T113000Z
DTEND:20191022T123000Z
CLASS:PUBLIC
CREATED:20191017T162828Z
DESCRIPTION: Current level of miniaturization in everyday devices indicates
  that micro and nano architectures have become functional elements in elec
 tronics and diminutive mechanical-based systems. Yet\, the potential of su
 ch multiscale functional elements is not fully realized due to incomplete 
 understanding of their deformation mechanisms in application relevant load
 ing conditions such as high strain rates (mimicking drops and impacts) and
  high/cryo temperatures. Even the state-of-the-art micro/nano mechanical t
 esters are currently incapable of conducting experiments in such harsh loa
 ding environments. Thus\, the mechanical properties of micro and nano scal
 e materials are largely unknown at strain rates beyond 0.1/s and temperatu
 res beyond 250°C or below room temperature. This premise forms the motiva
 tion of my research vision: “To investigate the small scale plasticity a
 nd failure mechanisms under extreme conditions\, using novel micro/nano me
 chanical experimental platforms”. In this presentation\, I will highligh
 t three aspects from my previous research: i) Instrumentation and protocol
 s for conducting extreme micro and nanomechanical testing\, ii) Case studi
 es of micro/nano scale metals and amorphous materials tested at high strai
 n rates and high temperature combinations and iii) Sample manufacturing te
 chniques for high through-put micro/nanomechanical testing. Specifically\,
  I will present the work on <i>in situ</i> nanomechanical testing at high 
 strain rates enabled by a custom-built hybrid piezo and microelectromechan
 ical systems (MEMS) based testing system and the case-study on silver nano
 wires tested at strain rates upto ~200/s. Further\, the instrumentation an
 d protocols for micromechanical testing at combinations of high strain rat
 es and extreme temperatures will be explained\, with a case study on fused
  silica and silicon micropillar compression at strain rates upto 1000/s an
 d temperatures upto 400°C. The final part of the talk will focus on my re
 cent work with unique manufacturing methods: two-photon lithography/electr
 odeposition combination and localized electrodeposition\, which are capabl
 e of manufacturing ideal damage-free test-beds of metallic micro/nano arch
 itectures including arrays of micropillars\, microsprings and complex micr
 olattices.\nSpeaker: Dr. Rajaprakash Ramachandramoorthy
LAST-MODIFIED:20191023T071959Z
LOCATION:Max-Planck-Institut für Eisenforschung GmbH\, Room: Large Confere
 nce Room No. 203
ORGANIZER;CN=Prof. Gerhard Dehm   :mailto:
SUMMARY:Pushing the boundaries of micro and nanomechanics:  <i>Pushing the 
 boundaries of micro and nanomechanics</i>
URL;VALUE=URI:https://www.mpie.de/events/21980/2768772
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