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

2. 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

3. Damping capacity 

4. Materials with damping capacity  Rubber membrane with 0.8 value of internal friction  Steel sample with internal friction 0.005 1 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

5. Shape memory alloys applications as materials with damping capacity

6. Analiza chimica a AMF urilor

7. Dilatometry tests

8. Differential Scanning Calorimetry (DSC) of studied alloys

9. Optical micrographs Optical micrographs

10. Scanning electron micrographs (SEM) Scanning electron micrographs (SEM)

11. EDAX study of investigated alloys

13. Studiu EDX a aliajelor investigate Part. III

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

15. Frecarea interna a unui aliaj cu memoria formei tip CuZnAl

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

17. 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.

18.  Paper was sustain by PCE-IDEI grant 616, project 83/01.10.2007 Thanks: Thanks: - Prof. Dr. Ing. Hopulele Ion - Conf. Dr. Ing. Stanciu Sergiu THE END