BEGIN:VCALENDAR
METHOD:PUBLISH
PRODID:www-matsim-tf-fau-de//Events//EN
VERSION:2.0
BEGIN:VEVENT
SUMMARY:Simulation Study of Multiple Loading Conditions for Shape Memo
 ry Alloy films - Sven Schmidt
UID:3d461925-3369-4341-9be4-6d306bcd657c
DESCRIPTION:Sven Schmidt WW8\, FAU 29. April 2025\, 17:00 WW8\, Fürth
  This study investigates the damping behaviour of a miniature NiTiFe s
 hape memory alloy (SMA) thin film device under various loads. SMAs are
  known for their shape memory effect and pseudoelasticity\, making the
 m ideal candidates for energy dissipation in dynamic systems. To model
  the thermomechanical behaviour of SMA films under rapid loading condi
 tions\, the Müller-Achenbach-Seelecke model is combined with a phase-
 field approach and implemented in the FEM package COMSOL Multiphysics.
  The simulation setup represents a 2D film rectangular geometry fixed 
 at one end\, with a weight attached to the other end to allow free vib
 ration. Various loading conditions are examined: In harmonic excitatio
 n the frequency dependence of the system is examined. In ramp loading 
 a strong temperature dependence for the Austenite-to-Martensite transf
 ormation is shown. Two simulation studies are conducted for the situat
 ion of shock loading: one to determine the maximum possible prestrain 
 without transformation and the other to find the minimal excitation fo
 rce required for transformation. These values are 275 MPa and 4 N\, re
 spectively. Two simulation series are carried out with different prest
 rain and excitation force pairings. As results\, z direction displacem
 ent\, logarithmic decrement\, temperature evolution\, and martensite f
 raction are analyzed in detail. Additionally\, the evolution of marten
 site and temperature during the first cycle is visually represented. T
 he study reveals that as the excitation force increases\, the frequenc
 y\, speed\, and work done also increase. The damping capacity is highe
 r at lower excitation force values. Prestrain has a significant impact
  on the logarithmic decrement\, with higher prestrain leading to a mor
 e constant damping over longer periods. A higher prestrain value negat
 ively affects the work done and damping capacity. The maximum damping 
 values are achieved at 50 MPa prestress\, after which 
DTSTART:20250429T150000Z
DTEND:20250429T160000Z
LOCATION:WW8\, Room 2.018-2\, Dr.-Mack-Str. 77\, Fürth
DTSTAMP:20260425T003506Z
END:VEVENT
END:VCALENDAR