The strain amplitude dependent internal friction at room temperature and the transition temperatures of CuAlMn-shape memory alloys with Al contents from 8.9 wt.% to 12.7 wt.% and Mn contents from 4.7 wt.% to 9.3 wt.% were investigated. The investigated strain range was 10-6 - 10-3. Rods of various compositions were die cast and machined to single clamped damping bars.
Analysis of Amplitude Dependence of Internal Damping Analysis of Amplitude Dependence of Internal Damping of AZ31 and AZ61 Alloys in Initial State and after Deformation The damping capacity, characterized by dissipation of mechanical energy, was examined in magnesium Elements Al Zn Si Mn P Fe Cu Mg
The damping capacity of high damping metals is st.rain dependent because the primary damping mechanisms function over a finite strain range. Such effects give rise to a weil defined peak in the plot of measured damping vs. specimen strain "amplitude. Examples of magne'ostrictive metallic materials exhibiting strain-dependent
Damping in Ruthenium Alloys Johnson Matthey Technology Fe-25% Ru undergoes a martensite transformation and has high damping capacity, dependent on the strain amplitude. For Fe-25% Ru, damping capacity increases with increasing E martensite content at < 3 × 10 4 strain amplitude. At strain amplitude > 4 × 10 4 it reached a peak for a volume fraction of 42 per cent of
Effect of precipitations on the damping capacity of Fe Jul 01, 2009 · But at higher strain amplitude, damping capacity increases more rapidly and Fe- Cr-Mo-1Nb possesses the highest damping capacity. This result reveals that larger amount of precipitations in Fe-Cr-Mo based alloys can interact with dislocations and generate an amplitude-dependent dislocation damping Q-1 dis at high strain amplitude.
The effect of heat treatment and grain size on the damping capacity of an FeCrAl alloy with composition of (wt%) Fe25Cr5Al has been investigated. It has been shown that annealing temperature and grain size have a significant influence on the damping capacity and
Internal Friction of Fe-Mn-Si-Based Shape Memory Alloys The damping behavior of an Fe-28Mn-6Si-5Cr-0.5NbC (mass%) shape memory alloy was measured by low cycle fatigue tests during tension-compression loadings. A remarkable damping capacity was observed above the strain amplitude of 0.1%, and the specific damping capacity (SDC) parameter reached saturation at ~ 80% above 0.4%. The reversible motion of the / interfaces is considered to
NAVAL POSTGRADUATE SCHOOL. Monterey, CaliforniaDamping capacity is found to be dependent on both strain amplitude and frequency. A comparison is made between these results and previous work which evaluated the strain dependence of damping in these alloys using more conventional experimental methods. Acossion For NTIS GRA&I DTIC TAB * Unannounood I J,3ustification By Distribution/
The results indicated that with the strain amplitude increasing above a critical value, the damping capacity of Fe19.35Mn alloy increased rapidly which could be explained using the breakaway
The dependence of damping capacity of PMMCs on strain It can be concluded that the dependence of the damping capacity on the strain amplitude 0 is due to the energy dissipation caused by local micro-plastic deformation near the interface of Al/SiC Temperature dependence of the damping capacity in Fe19 May 08, 2008 · The moving mode of damping sources was realized by the moving of Shockley partial dislocations, and the variation of damping capacity with strain amplitude at different temperatures was in accord with the breaking away model of Shockley partial dislocations (GL model). With the temperature increasing (25280 °C), the damping capacity of Fe19.35Mn alloy was improved greatly because of the effect of thermo-assisted unpinning, which decreased the binding force between Shockley partial