Damping Capacity Investigation of some Copper based alloys through Thermal Analysis PhD student Nicanor Cimpoesu Faculty S.I.M. Iai

Contents  Damping capacity  Materials with big internal friction and applications  Investigated alloys characterization - spectrometer - spectrometer - D.I.L. - D.I.L. - D.S.C. - D.S.C. - optical micrographs - optical micrographs - S.E.M. and E.D.X. - S.E.M. and E.D.X. - D.M.A - D.M.A  Conclusions

Damping capacity 

Materials with damping capacity  Rubber membrane with 0.8 value of internal friction  Steel sample with internal friction Hz frequency.  Adhesive with low viscosity with 6 the value of internal friction at –20 °C temperature.  A quartz with 0.2 and a shape memory alloy TiNiCu with 0.12

Shape memory alloys applications as materials with damping capacity

Analiza chimica a AMF urilor

Dilatometry tests

Differential Scanning Calorimetry (DSC) of studied alloys

Optical micrographs Optical micrographs

Scanning electron micrographs (SEM) Scanning electron micrographs (SEM)

EDAX study of investigated alloys

Studiu EDX a aliajelor investigate Part. III

Damping capacity investigation with a DMA (dynamic mechanical analyzer) equipment

Frecarea interna a unui aliaj cu memoria formei tip CuZnAl

Applications of S.M.A.-s with big internal friction and shape memory effect

Conclusions Conclusions  Two alloys from copper-zinc system was obtain in classical conditions, and after investigation with a differential dilatometer reveals nice shape memory effect.  Using combined equipments we can analyze and conclude on thermal behavior at heating and cooling of a shape memory alloy like transformation points, damping capacity and elastic modulus variation with temperature.  Small value of internal friction at room temperature of a shape memory alloy can’t be used in energy dissipation applications. Contrarily the same Cu-Zn-Al SMA presents a nice peak of internal friction around temperature of 90 ºC, in transformation points range, of 0,116 which can be use for practical applications.

 Paper was sustain by PCE-IDEI grant 616, project 83/ Thanks: Thanks: - Prof. Dr. Ing. Hopulele Ion - Conf. Dr. Ing. Stanciu Sergiu THE END