Damping measurements of laminated composite materials and aluminum using the hysteresis loop method

Abramovich, Haim; Govich, D.; Grunwald, A.

doi:10.1016/j.paerosci.2015.05.006

Cited by 21 publications

(11 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To characterize the damping capacity of a hybrid material, it is noted that the damping characteristics of viscoelastic materials are dependent on frequency and they are defined by the variable complex modulus T* ( ω ) [53,54,55], as shown in Equation (4):

T * (ω) = T^{'} (ω) + i \cdot T^{″} (ω) = T (ω) \cdot (1 + i \cdot η (ω)),

where T ( ω ) = T’ ( ω ) is the storage modulus, T’’ ( ω ) is the loss modulus and η ( ω ) is the loss factor that is defined by the Equation (5):

η false(ω false) = \frac{T^{″} false(ω false)}{T^{'} false(ω false)},

…”

Section: The Modal Analysis Of the Lightweight Structuresmentioning

confidence: 99%

Vibration Damping Analysis of Lightweight Structures in Machine Tools

et al. 2017

View full text Add to dashboard Cite

The dynamic behaviour of a machine tool (MT) directly influences the machining performance. The adoption of lightweight structures may reduce the effects of undesired vibrations and increase the workpiece quality. This paper aims to present and compare a set of hybrid materials that may be excellent candidates to fabricate the MT moving parts. The selected materials have high dynamic characteristics and capacity to dampen mechanical vibrations. In this way, starting from the kinematic model of a milling machine, this study evaluates a number of prototypes made of Al foam sandwiches (AFS), Al corrugated sandwiches (ACS) and composite materials reinforced by carbon fibres (CFRP). These prototypes represented the Z-axis ram of a commercial milling machine. The static and dynamical properties have been analysed by using both finite element (FE) simulations and experimental tests. The obtained results show that the proposed structures may be a valid alternative to the conventional materials of MT moving parts, increasing machining performance. In particular, the AFS prototype highlighted a damping ratio that is 20 times greater than a conventional ram (e.g., steel). Its application is particularly suitable to minimize unwanted oscillations during high-speed finishing operations. The results also show that the CFRP structure guarantees high stiffness with a weight reduced by 48.5%, suggesting effective applications in roughing operations, saving MT energy consumption. The ACS structure has a good trade-off between stiffness and damping and may represent a further alternative, if correctly evaluated.

show abstract

T * (ω) = T^{'} (ω) + i \cdot T^{″} (ω) = T (ω) \cdot (1 + i \cdot η (ω)),

where T ( ω ) = T’ ( ω ) is the storage modulus, T’’ ( ω ) is the loss modulus and η ( ω ) is the loss factor that is defined by the Equation (5):

η false(ω false) = \frac{T^{″} false(ω false)}{T^{'} false(ω false)},

…”

Section: The Modal Analysis Of the Lightweight Structuresmentioning

confidence: 99%

Vibration Damping Analysis of Lightweight Structures in Machine Tools

et al. 2017

View full text Add to dashboard Cite

show abstract

Section: The Modal Analysis Of the Lightweight Structuresmentioning

confidence: 99%

Vibration Damping Analysis of Lightweight Structures in Machine Tools

Aggogeri

Borboni

Merlo

et al. 2016

Preprint

View full text Add to dashboard Cite

Abstract:The dynamic behaviour of a machine tool (MT) directly influences the machining performance. The adoption of lightweight structures may reduce the effects of undesired vibrations and increase the workpiece quality. This paper aims to present and compare a set of hybrid materials that may be excellent candidates to fabricate the MT moving parts. The selected materials have high dynamic characteristics and capacity to dampen mechanical vibrations. In this way, starting from the kinematic model of a milling machine, this study evaluates a number of prototypes made of Al foam sandwiches (AFS), Al corrugated sandwiches (ACS) and composite materials reinforced by carbon fibres (CFRP). These prototypes represented the Z-axis ram of a commercial milling machine. The static and dynamical properties have been analysed by using both finite element (FE) simulations and experimental tests. The obtained results show that the proposed structures may be a valid alternative to the conventional materials of MT moving parts, increasing machining performance. In particular, the AFS prototype highlighted a damping ratio that is 20 times greater than a conventional ram (e.g., steel). Its application is particularly suitable to minimize unwanted oscillations during high-speed finishing operations. The results also show that the CFRP structure guarantees high stiffness with a weight reduced by 48.5%, suggesting effective applications in roughing operations, saving MT energy consumption. The ACS structure has a good trade-off between stiffness and damping and may represent a further alternative, if correctly evaluated.

show abstract

“…15 It was found that the loss factor, h, obtained via the hysteresis loop method was linearly dependent only on the applied excitation frequency and was independent of the preloading and the stress amplitudes. 16 In Bulut et al, 18 the results revealed that the position and the percentage of the fibres in composites were the most effective parameters for natural-frequency and damping characteristics. Even in cutting, the amount of wooden reinforcement in wood-plastic composites affects the shape of the formed chips.…”

Section: Introductionmentioning

confidence: 98%

“…Research on damping and vibration characteristics with respect to the effect of fibre orientations in different lay-up was conducted in Bozkurt et al, 15 Abramovich et al 16 and Nagasankar et al 17 It was observed that damping and vibration characteristics of the composite samples were strongly affected by the fibre orientation of the basalt/epoxy composite. The increase in the angle of the fibre orientation from 0°to 45°resulted in a decrease in the natural frequencies and an increase in the damping ratios.…”

Section: Introductionmentioning

confidence: 99%

Damping properties of fibre composite and conventional materials measured by free damped vibration response

Murčínková

Vojtko

Halapi

et al. 2019

Advances in Mechanical Engineering

View full text Add to dashboard Cite

The present work contributes to the research on the damping properties of fibre composites through an experimental approach by using the free damped vibration measurement based on impulse-force system response, the developed measurement stand and laser Doppler vibrometry. Moreover, the influence of the material configuration on the damping properties was investigated and was compared with conventional homogeneous isotropic materials. The measurement was based on the analysis of flexural vibrations generated by the Dirac impulse force, as well as on the free decayingvibrations response; the time-and frequency-domain modal identification was employed. The fibre composites were represented as layered bidirectional long carbon-and glass-fibre composites (laminates) with different material configurations and as short carbon-fibre composites.

show abstract

Damping measurements of laminated composite materials and aluminum using the hysteresis loop method

Cited by 21 publications

References 22 publications

Vibration Damping Analysis of Lightweight Structures in Machine Tools

Vibration Damping Analysis of Lightweight Structures in Machine Tools

Vibration Damping Analysis of Lightweight Structures in Machine Tools

Damping properties of fibre composite and conventional materials measured by free damped vibration response

Contact Info

Product

Resources

About