Static strains in the vicinity of 1.0 X 10(-4) caused the formation of a damping peak, which accelerated the increase of the damping capacity in the M2052 alloy, but softened the decrease of the
Characterization of the Strain-amplitude and Frequency The loss factor results were described in a contour map as the function of both strain-amplitude and frequency. Logarithmic decrement and loss factor were also obtained from the free-decaying oscillations at the first resonant frequency and different strain-amplitudes. The damping capacity of the alloy at larger strain-amplitudes could be also affected by the damping mode.
Based on the damping alloy Fe-13Cr-6Al, five types of alloys are prepared in the present study with 1 at.% of Cr replaced by Mo, Mn or Nb, and 0.5 at.% of Al replaced by Cu. The effects of annealing temperature, vibrating frequency, strain-amplitude and static load on the damping capacity of these alloys are studied through damping capacity measurement and optical microscope observation.
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
Mn segregation dependence of damping capacity of as-cast A maximum in the strain-amplitude-dependent damping was obtained for the 4-hour-aged sample for which a magnetostriction constant, , equal to 4.65 × 10-4, was derived.
Damping 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 Damping Behavior of Ni Added MnCu Damping the strain-amplitude dependent damping behavior in the alloys. However, the update magenetoelastic damping mod- dependent variation of damping capacity in the three alloys. One is the phase-transformation damping peak, occurred at a temperature about 20K lower than the respective phase Alloy Mn Cu Ni Fe
The Effects of Static Strain on the Damping Capacity of The damping capacities of Fe-13Cr-6AI, Fe-12Cr-1Mo-6AI and Fe-12Cr-1Mn-6AI (at.%) alloys as a function of strain-amplitude tested in a given static load are characterized in the 3-point bending
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.Strain amplitude dependence of the damping capacity in Fe OSTI.GOV Journal Article:Strain amplitude dependence of the damping capacity in Fe-17%Mn alloy Title:Strain amplitude dependence of the damping capacity in Fe-17%Mn alloy Full Record