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strain amplitude dependence of the damping capacity in fe

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DAMPING CAPACITY OF Fe-Cr AND Fe-Cr BASED HIGH

The high damping capacity, P, of these alloys (typically P > 30 is caused by a large magneto-mechanical hysteresis loss. As such, the damping capacity does not depend on the frequency of the vibration but, on the other hand, strongly depends on the strain amplitude and on Damping Capacity of Fe17mass%Mn High Damping by bend mode vibrations in elastic amplitude. It is reported that an Fe­17mass%Mn alloy exhibits the highest damping capacity in Fe­Mn binary system.6) In this study, the effects of the thermo-mechanical training featured by bending mode on microstructure, hardness and damping capacity in an Fe­ 17mass%Mn alloy have been studied. 2.

Damping in Ruthenium Alloys Johnson Matthey

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 Ni Doping on Strength and Damping Capacity of Fe At low strain amplitudes and ambient temperature, the high damping capacity of FeAl alloys is usually attributed to the magneto-mechanical damping associated with the irreversible motion of magnetic domain walls. 5,6,7,8,9,10,11,12) However, the ultimate tensile strength of binary FeAl alloys was approximately 500 MPa, not enough to use Effect of precipitations on the damping capacity of Fe Oct 20, 2009 · Addition of 1.0% Nb can significantly decrease damping capacity of Fe-Cr-Mo-1Nb at low strain amplitude. 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

Fatigueresistant FeMnSibased alloy seismic dampers to

Sep 17, 2020 · The bracetype dampers were designed to bear loads of approximately ±2600 kN with a strain amplitude of ±0.5%, thereby dependent on the assumed building design conditions. The strain distribution of the damper during axial deformation, as calculated by a nonlinear elastoplastic finite element method under monotonic loading using LSDYNA High-damping metals and alloys SpringerLinkHigh-Damping Metals (HIDAMETS) are the physical metallurgists answer to unwanted noise and vibrations. However, the characterization of the damping properties of metals and alloys is neither simple nor straightforward. This is mainly because the damping mechanisms involved depend upon the stress-induced movement of defects in the metal in question which, in turn, implies a dependence Influences of Heat Treatment and Grain Size on the Damping 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 strain amplitude dependence

Lijian Rong's research works Chinese Academy of Sciences

The precipitating behavior of Cu-riched particles during isothermally aging and its effect on hardness and damping capacity of Fe-16Cr-2.5Mo-1.0Cu damping alloy have been investigated by atom MAGNETOSTRICTIVE DAMPING TO REDUCE NOISE Fig. 1:Damping capacity versus strain amplitude in cast alloys, a) Fe-16Cr annealed 1 h at temperatures indicated, b) Fe-16Cr-2A1 annealed at 1100 0 Mechanism of heat-induced damping attenuation for Fe Nov 18, 2020 · The range of strain amplitude for IF is from 0 × 10 6 to 1000 × 10 6, and the vibration frequency is 1 Hz. In our experiment, we take the IF value at the strain amplitude of 800 × 10 6 as the damping capacity of these specimens.

Strain Amplitude Dependence of Damping Capacity in

An investigation on low frequency strain amplitude dependence damping characteristic of as-cast high damping Mg-based alloys continuously extending to microplastic strain was carried out. Two-stage damping behavior via strain amplitude was particularly reported. The first is the strain amplitude strongly dependent part due to breakaway loss and the second is the strain amplitude weakly The inuence of heat treatment on damping response of 3.2. Damping capacity 3.2.1. The inuence of heat treatment on damping capacity of AZ91D at room temperature The strain dependence of damping capacity was investi-gated by DMA at room temperature at a vibration frequency Fig. 1. Optical micrographs of the damping specimens:(a) As-cast; (b) T4; (c) T6, 4h; (d) T6, 8h and (e) T6, 12h. Transformation Behavior and its Effect on Damping [9] are reported to exhibit the same behavior. But Fe-Mn alloys shows stronger strain amplitude dependence. As heat treatment temperature increases, damping capacity improves, reaching its maximum around 1000'C. Further increase in the temperature, however, aggravates damping capacity.

Ultrahigh damping in R-phase state of TiNiFe alloy

Developing high damping materials with high strength is of significant technological importance, and TiNi-based alloys are attracting much attention in this respect. The high damping peak in martensite state has been shown to be related to the interaction between twin boundary and hydrogen according to recent studies. In this letter the authors studied damping capacity of R phase in Ti 50 Ultrahigh damping in R-phase state of TiNiFe alloy Developing high damping materials with high strength is of significant technological importance, and TiNi-based alloys are attracting much attention in this respect. The high damping peak in martensite state has been shown to be related to the interaction between twin boundary and hydrogen according to recent studies. In this letter the authors studied damping capacity of R phase in Ti 50 The effect of grain size on the damping capacity of Fe-17 Jan 23, 2017 · The grain size dependence of the damping capacity of Fe-17 wt%Mn steel was investigated. A high damping capacity was measured in the ultra-fine grained steel, despite its lower volume fraction of martensite and lower density of variant boundaries and / phase boundaries.

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