Damping Capacity Damping Capacity Investigation of some Copper Investigation of some Copper based alloys through Thermal based alloys through Thermal

Analysis Analysis

PhD studentPhD student Nicanor Cimpoesu Nicanor Cimpoesu

FacultFacultyy S.I.M. Ia S.I.M. Iașiși

ContentsContents Damping capacityDamping capacity Materials with big internal friction and applicationsMaterials with big internal friction and applications Investigated alloys characterizationInvestigated 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 ConclusionsConclusions

Damping capacity Damping capacity

Materials with damping capacityMaterials with damping capacity

Rubber membrane with 0.8 value of internal friction Rubber membrane with 0.8 value of internal friction Steel sample with internal friction 0.005 1 Hz frequency.Steel sample with internal friction 0.005 1 Hz frequency.

Adhesive with low viscosity Adhesive with low viscosity with with 6 the value of internal friction at –20 6 the value of internal friction at –20 °C temperature.°C temperature.

A quartz with 0.2 and a shape memory alloy TiNiCu with 0.12A quartz with 0.2 and a shape memory alloy TiNiCu with 0.12

Shape memory alloys applications as Shape memory alloys applications as

materials with damping capacity materials with damping capacity

Analiza chimica a AMF urilorAnaliza chimica a AMF urilor

Dilatometry tests Dilatometry tests

Differential Scanning CalorimetryDifferential Scanning Calorimetry (DSC) of studied alloys (DSC) of studied alloys

Optical micrographs Optical micrographs

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

EDAX study of investigated alloys EDAX study of investigated alloys

Studiu EDX a aliajelor investigateStudiu EDX a aliajelor investigatePart. IIIPart. III

Damping capacity investigation with Damping capacity investigation with a DMA (dynamic mechanical a DMA (dynamic mechanical

analyzer) equipment analyzer) equipment

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

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

ConclusionsConclusions Two alloys from copper-zinc system was obtain in Two alloys from copper-zinc system was obtain in

classical conditions, and after investigation with a classical conditions, and after investigation with a differential dilatometer reveals nice shape memory differential dilatometer reveals nice shape memory effect.effect.

Using combined equipments we can analyze and Using combined equipments we can analyze and conclude on thermal behavior at heating and cooling of a conclude on thermal behavior at heating and cooling of a shape memory alloy like transformation points, damping shape memory alloy like transformation points, damping capacity and elastic modulus variation with temperature. capacity and elastic modulus variation with temperature.

Small value of internal friction at room temperature of a Small value of internal friction at room temperature of a shape memory alloy can’t be used in energy dissipation shape memory alloy can’t be used in energy dissipation applications. Contrarily the same Cu-Zn-Al SMA applications. Contrarily the same Cu-Zn-Al SMA presents a nice peak of internal friction around presents a nice peak of internal friction around temperature of 90 ºC, in transformation points range, of temperature of 90 ºC, in transformation points range, of 0,116 which can be use for practical applications.0,116 which can be use for practical applications.

Paper was sustain by PCE-IDEI grant 616, project 83/01.10.2007Paper was sustain by PCE-IDEI grant 616, project 83/01.10.2007

ThanksThanks::

- Prof. Dr. Ing. Hopulele IonProf. Dr. Ing. Hopulele Ion

- Conf. Dr. Ing. Stanciu Sergiu Conf. Dr. Ing. Stanciu Sergiu

THE END THE END