energy storage stiffness and energy dissipation stiffness
Experimental assessment of stiffness and energy dissipation properties ...
Table 3, Table 4, Table 5 report the storage stiffness values for each test of the UD specimen, respectively for the two tested configurations UD-0° and UD-90°. Similarly to the QI case, the stiffness presents a decreasing trend with frequency as well as amplitude the imposed displacement, as shown in Fig. 11. It is also worth noticing that ...
Read MoreTunable Mechanical Metamaterial with Constrained Negative …
without decreasing the stiffness by embedding a small volume fraction of negative stiffness (NS) inclusions within it. Unlike other systems that dissipate energy primarily through large-amplitude deformation of nonlinear structures, this metamaterial dissipates energy by amplifying linear strains in the viscoelastic host material.
Read MoreProgrammable Bidirectional Mechanical Metamaterial with Tunable Stiffness and Frictional Energy Dissipation …
Energy‐dissipating mechanical metamaterials possess broad applications where absorbing shocks and isolating vibrations within monolithic and sandwich composite structures are required. This study presents the design of a novel bidirectional mechanical metamaterial with tunable stiffness and energy dissipation.
Read MoreEnergy spectra and performance assessment of isolated
Energy spectra for negative stiffness amplification system NSAS in isolation system. • Enhanced energy dissipation design for NSAS-based isolation technology. • Energy-based performance assessment for NSAS-based isolated structure. • Easy-to-use formulae for quick performance assessment in classified ground motions.
Read MoreTunable Mechanical Metamaterial with Constrained Negative Stiffness …
The main objectives are to examine the tradeoff between the stiffness and energy dissipation of the composite and to identify the mechanisms for enhanced energy dissipation.Methods To achieve this ...
Read MoreSILICOMB PEEK Kirigami cellular structures: mechanical response …
A zero stiffness regime can be observed for the higher maximum strain applied at 1 mm min −1 (figure 8(a)), similarly to the behaviour recorded for the quasi-static tests. The energy lost during the cycle tends to increase significantly as soon the ZS part of the force–displacement curve is reached.
Read MoreStiffness and Energy Dissipation of Polymer Matrix Composites …
Recent research demonstrates that it is possible to simultaneously achieve increased stiffness and energy dissipation for a configuration of a viscoelastic polymer …
Read MoreMechanical design and energy storage efficiency …
The energy storage efficiency is an important performance of a robot or a man–machine interaction device. This …
Read MoreThe effect of ankle foot orthosis stiffness on the energy cost of ...
A: Low AFO stiffness, resulting in high energy cost, and low energy storage by the AFO. B: The lowest AFO stiffness for which heel rise occurs before contralateral heel strike. C: AFO stiffness at which the most energy is stored and released by the AFO. D: AFO stiffness resulting in the lowest energy cost of walking.
Read MoreEnergy spectra and performance assessment of isolated
Enhanced energy dissipation design for NSAS-based isolation technology. ... coordination with a tuning spring and energy dissipation device can result in a complete solution for energy storage and dissipation. By connecting the negative stiffness device in series with a subsystem including a tuning spring and a linear viscous damper, a negative ...
Read MoreEQCM-D technique for complex mechanical characterization of energy …
The physical origin of the frequency and resonance width changes in these both cases is due to the specific pathways of the oscillation energy dissipation. For stiff electrodes the dissipation is due to the hydrodynamic solid-liquid interactions within the boundary layer (dependent on the electrode structure) whereas for softer electrodes the ...
Read MoreExperimental assessment of stiffness and energy dissipation properties of disk-shaped polymer-based composite specimens …
Highlights. •. A novel approach was proposed to exert cyclic in-plane torsion loads on composites. •. The loads were provided by combining a testing machine and a dedicated structure. •. The approach enables the assessment of material stiffness and damping properties. •. Sine signals were used to assess high frequency and amplitude …
Read MoreEnhance the energy dissipation ability of sleeve-type negative stiffness structures via …
The results show that the proposed strategy can significantly improve the energy dissipation ability of parallel structures using a small number of negative …
Read MoreEffect of frequency and amplitude on dynamic behaviour, stiffness ...
Evaluation of strength loss under such loading conditions is essential for soil stability analysis. The present study investigates the cyclic response, stiffness degradation behaviour with number of loading cycles and cumulative energy dissipation characteristics within the soil mass of cohesive geomaterial.
Read More3D-printed polymer foams maintain stiffness and energy …
unique energy dissipation and fatigue performance. These thermally-activated 3D-printed foams are remarkably resilient under high strain cyclic loading, maintaining energy dissipation capability and stiffness. Our results establish that 3D-printed polymer foams are good candidates for use as lightweight, energy-absorbing materials. Figure 1.
Read MoreTest Study on Failure and Energy Supply Characteristics of Rock under Different Loading Stiffness …
Aiming at the above problems, this paper improved the rock mechanics testing machine, and developed several sets of low stiffness flexible rings, which realized laboratory test under five ...
Read MoreEnergy Transfer and Dissipation in Combined-Stiffness
The impacts of the stiffness gap, piecewise linear stiffness coefficient, and cubic stiffness coefficient on the system are analyzed by studying the energy transfer efficiency equation.
Read MoreVariable Stiffness Springs for Energy Storage Applications
Abstract: Theory suggests an inverse relation between the stiffness and the energy storage capacity for linear helical springs: reducing the active length of the spring by 50% increases its stiffness by 100%, but reduces its energy storage capacity …
Read MoreOptimizing elastic potential energy via geometric nonlinear stiffness ...
The elastic storage of energy in hopping kangaroos ... and energy dissipation ... Fig. 9 (b) and (d) show the normalized energy as a function of the stiffness ratio, and markers denote the energy corresponding to the case illustrated in the corresponding panel on top. It can be seen that, despite the stiffness values are …
Read MoreSeismic resilience assessment of self-centering prestressed concrete frame with different energy dissipation ratio and second stiffness ...
Fig. 2 (a) shows a simplified schematic diagram of the SCPC node. Among the parameters, R represents the rotation center, θ represents the node rotation angle, T i, F j, d i, r j represents the tensile force of the i-th post-tensioned tendon (PT tendon), the friction force of the j-th damper, and their respective arm length to the center of rotation.
Read MoreStorage stiffness and loss factor versus a: (a) storage stiffness, (b ...
The storage stiffness K d = F d /u d,max related to energy absorbing characteristic and the loss factor η d related to the damping characteristic are determined, where F d is the damper force at ...
Read MoreEnergy Transfer and Dissipation in Combined-Stiffness Nonlinear Energy …
Abstract. Nonlinear energy sinks (NES) are highly efficient vibration energy absorption and dissipation devices, and play an important vibration-suppression role in many types of structures. In this study, the influence of parameters on the combined stiffness nonlinear energy sink system is revealed from the perspective of energy, in …
Read MoreComparison of mean values of roughness, adhesion, energy dissipation…
Comparison of mean values of roughness, adhesion, energy dissipation, and stiffness, from statistical evaluation of AFM images measured under identical conditions at the cathodes before and after ...
Read MoreThe loss factor, energy dissipation, and dynamic average stiffness ...
The dynamic stress-strain curve of metal rubber is divided into three stages: elastic stage, plastic stage, and failure stage. The optimal energy absorption efficiency is greater than 0.5, and the ...
Read MoreExperimental investigation on static and dynamic energy dissipation …
The dynamic energy dissipation, specific energy absorption, average impact stiffness, and impact energy loss rate are used to evaluate the dynamic mechanical properties of buffer structures (DSS and EMWM/DS.).
Read MoreDecreased Elastic Energy Storage, Not Increased Material Stiffness…
As expected, Fbln5 +/ + arteries had a good structure–function relation, with systolic energy storage increasing with higher ϕ e (R 2 = 0. 62) and energy dissipation increasing with higher ϕ c (R 2 = 0. 73).
Read MoreStiffness and energy dissipation in polyurethane auxetic foams
Conclusions. An established manufacturing process for producing thermoplastic auxetic cylinder foam from flexible PU foams specimens with an initial diameter of 30 and 48 mm has been modified, and the resulting auxetic foam mechanically tested. Density, Poisson''s ratio, stiffness and dissipation of energy were identified for …
Read MoreTunable Mechanical Metamaterial with Constrained Negative Stiffness …
This paper presents the computational design, fabrication, and experimental validation of a mechanical metamaterial in which the damping of the material is significantly increased without decreasing the stiffness by embedding a small volume fraction of negative stiffness (NS) inclusions within it. Unlike other systems that dissipate energy …
Read MoreProgrammable Bidirectional Mechanical Metamaterial with …
Energy‐dissipating mechanical metamaterials possess broad applications where absorbing shocks and isolating vibrations within monolithic and sandwich composite structures are required. This study presents the design of a novel bidirectional mechanical metamaterial with tunable stiffness and energy dissipation.
Read MoreIdentification of Structural Stiffness and Energy Dissipation Parameters …
Established high temperature operation of gas foil bearings (GFB) is of great interest for gas turbine applications. The effects of (high) shaft temperature on the structural stiffness and mechanical energy dissipation parameters of a foil bearing (FB) must be assessed experimentally. Presently, a hollow shaft warmed by an electric heater …
Read MoreAdvanced Theory and Simulations
The true energy loss of the metamaterial can be approximated with a fine-meshed finite element simulation. A finite element model with 34 074 elements was run and produced a volumetric energy dissipation of 0.751 kJ m −3. However, the simulation took 445 min to run on a single core, highlighting the need for an optimized mesh.
Read MoreStorage stiffness and loss factor versus a: (a) storage …
The storage stiffness K d = F d /u d,max related to energy absorbing characteristic and the loss factor η d related to the damping characteristic are determined, where F d is the damper force at ...
Read MoreEnergy spectra and performance assessment of isolated structures …
The developed energy spectra are effective in evaluating the energy dissipation enhancement and structural energy dissipation reduction levels of NSASs …
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