Effect Of Improving Damping Ratio On Surface Finish By Filling Particulate Reinforced Polymer Composites In Machine Tool Structures

Vivek, Anupam; Holla, Vijaya; Krupashankara, M.S.; Vignesh, A.; Kulkarni, Prasanna

doi:10.1016/j.matpr.2018.02.203

Cited by 10 publications

(6 citation statements)

References 13 publications

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“…Ratio of volume of polymer composites to volume of steel in the polymer hybrid structure was increased up to 75% and its response for vibration was investigated. 23 In the present work, EG (x¼0.01 to 0.03) 18 is identified as a suitable material which has a damping ratio one order higher than that of cast iron (x¼0.0015). It also has an edge over polymer and mineral casting in respect of damping characteristics.…”

Section: Introductionmentioning

confidence: 92%

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Design and analysis of epoxy granite vertical machining centre base for improved static and dynamic characteristics

Venugopal

Dhanabal

Thyla

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part L:

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The structural vibration in conventional machine tools which are generally made of cast iron may lead to poor surface finish of the machined components. This has led to the investigations on alternative materials for machine tool structures such as concrete, polymer concrete and epoxy granite which have higher damping properties but lesser Young's modulus. However, higher static stiffness with higher damping is essential for improving the static and dynamic characteristics of machine tool structures. Hence, this work focuses on replacing the vertical machining centre base made of cast iron with steel reinforced epoxy granite to improve the structural static stiffness. A finite element model of the above base is developed and validated against the experimental data obtained using modal analysis. The validated numerical approach is applied for investigating the seven progressive design configurations of base reinforced with steel. It is found that the epoxy granite base of Design configuration-7 with L-channels has significantly reduced the deformation by 56 and 36% considering milling and drilling operations, respectively, in comparison to cast iron base. Further, the natural frequencies of the above configuration are higher in all the modes (by more than 50%) under consideration than those of the existing cast iron structure. Therefore, the proposed configuration of base is a viable alternative for the existing base in order to achieve higher structural damping. The novelty of the present work is the design of epoxy granite vertical machining centre base using steel reinforcements to improve structural rigidity with ease of manufacturing.

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Section: Introductionmentioning

confidence: 92%

“…Ratio of volume of polymer composites to volume of steel in the polymer hybrid structure was increased up to 75% and its response for vibration was investigated. 23…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of epoxy granite vertical machining centre base for improved static and dynamic characteristics

Venugopal

Dhanabal

Thyla

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part L:

View full text Add to dashboard Cite

show abstract

“…Researchers found that polymer composites (both layered and particulate) had a significant effect on the damping for applications of high-frequency vibrations, and they measured a reduction in the resonant peak up to 30%, mainly by using polymer matrices (more in [ 19 , 20 ]). Researchers have investigated the field of applications that use polymer concrete for a machine base frame or to fill existing machine designs to improve the dynamic stiffness in advanced applications of production-machine components for precision-tool machines [ 16 , 21 ], a grinding machine [ 22 ], and a machine-tool worktable [ 23 ]. Polymer-matrix composites can be both machined [ 24 ] and a component part of machine-tool frames.…”

Section: Introductionmentioning

confidence: 99%

Parameters Influence on the Dynamic Properties of Polymer-Matrix Composites Reinforced by Fibres, Particles, and Hybrids

2022

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In this paper, we present an extensive experimental study on the dynamic mechanical properties of composites with polymer matrices, as well as a quantification of the parameters that influence these properties. Polymer-composite matrices make it possible to form any reinforcement arrangement of fibres, particles, and layers, which makes it possible to form composite materials with certain dominant mechanical properties according to the internal arrangement for the application. In this study, we focused on the dynamic properties (i.e., damping parameters, such as the loss factor (tan d), logarithmic decrement (λ), storage modulus (E′), and loss modulus (E″)) of composites with polymer matrices, including parameters such as the fibre material, fabric weaving, fibre orientation, temperature, frequency, particle size, volume of short fibres, and epoxy resin type. If other articles focus on one type of composite and 1–2 parameters, then the benefit of this article lies in our analysis of 8 mentioned parameters in the experimental analysis of 27 different types of composites with polymer matrices. The tested fibre materials were glass, aramid, and carbon; the tested woven fabrics were twill, plain, unidirectional, and satin; the temperature range was from −50 to +230 °C; the frequency was 1 Hz and 10 Hz; the particle size was 0.1–16 mm; the volume percentages of the short fibres were 3, 6, and 12 vol.% of the hybrid polymer composites and the type of polymer matrix. We used the free-damped-vibration method with vibration dynamic signal analysis and the forced-damped vibration of dynamic mechanical thermal analysis for testing. We ranked the parameters that influence the dynamic vibration properties according to the effects. Among sets of results provided in the paper, considering the storage modulus, loss modulus, and loss factor, the best results of the fibre composites were for aramid-fibre-reinforced polymers, regardless of the weave type, with an advantage for unidirectional fabric. The best results of the particle composites were for those with fine filler sizes that incorporated the short fibres.

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“…Depending on the specific application, material engineers develop materials with conflicting properties, namely high rigidity and low increase in the damping capacity, the natural frequency of the corresponding mode shapes of the machine tool body [25][26][27]. The performance of a grinding machine hybrid structure has been evaluated using surface roughness [5]. The use of a polymer concrete bed of the CNC turning centre has resulted in improved behaviour in terms of tool wear and surface roughness [28].…”

Section: Introductionmentioning

confidence: 99%

Re-Design of Machine Tool Joint Components Based on Polymer Fillings for High-Speed Performance

2021

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In this paper, we report the results of an experimental study of a re-design approach using filling polymers and particulate composites with a polymer matrix, thus creating a macroscopic hybrid structure. The re-design is focused on the joint of a textile machine. It is a re-design of already existing machine parts of a joint in order to increase the damping of components, reduce the amplitudes of high-frequency vibrations and acoustic emission for high-speed operation of textile rotors, and to compare individual structural modifications of the rotor housing body and absorber of high-speed textile rotor in a spinning unit with respect to dynamic properties of that measured mechanical system. The experiments included a bump test, determination of logarithmic decrement, measurement of vibration acceleration, a wavelet analysis, and measurement of acoustic emission. When excited by high frequency signal amplitudes up to 5 g, the benefits of polymer filling were manifested by an approximately 50% reduction in amplitude vibrations, a 66% reduction in acoustic emission amplitude, and an 85% reduction of the maximum peak in the acoustic emission FFT spectrum. In the area above 10 g, the stiffness of the component dominated to reduce the magnitude of vibrations.

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Effect Of Improving Damping Ratio On Surface Finish By Filling Particulate Reinforced Polymer Composites In Machine Tool Structures

Cited by 10 publications

References 13 publications

Design and analysis of epoxy granite vertical machining centre base for improved static and dynamic characteristics

Design and analysis of epoxy granite vertical machining centre base for improved static and dynamic characteristics

Parameters Influence on the Dynamic Properties of Polymer-Matrix Composites Reinforced by Fibres, Particles, and Hybrids

Re-Design of Machine Tool Joint Components Based on Polymer Fillings for High-Speed Performance

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