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

Murčínková, Zuzana; Adamčík, Pavel; Živčák, Jozef

doi:10.3390/ma14226913

Cited by 4 publications

(4 citation statements)

References 31 publications

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“…Subsequent biochemical, biomechanical, and material laboratory testing of the extracted screws revealed information important for designing new screws; see [33]. The long-term goal is to The study of dynamic properties of screws and bone interaction via experiments can also be applied, and screws or their parts can be made of composites as well; see [39].…”

Section: Discussionmentioning

confidence: 99%

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Stochastic Strength Analyses of Screws for Femoral Neck Fractures

et al. 2022

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This paper represents a multidisciplinary approach to biomechanics (medicine engineering and mathematics) in the field of collum femoris fractures, i.e., of osteosyntheses with femoral/cancellous screws with full or cannulated cross-sections. It presents our new numerical model of femoral screws together with their stochastic (probabilistic, statistical) assessment. In the first part of this article, the new simple numerical model is presented. The model, based on the theory of planar (2D) beams on an elastic foundation and on 2nd-order theory, is characterized by rapid solution. Bending and compression loadings were used for derivation of a set of three 4th-order differential equations. Two examples (i.e., a stainless-steel cannulated femoral screw and full cross-section made of Ti6Al4V material) are presented, explained, and evaluated. In the screws, the internal shearing forces, internal normal forces, internal bending moments, displacement (deflections), slopes, and mechanical stresses are calculated using deterministic and stochastic approaches. For the stochastic approach and a “fully” probabilistic reliability assessment (which is a current trend in science), the simulation-based reliability assessment method, namely, the application of the direct Monte Carlo Method, using Anthill software, is applied. The probabilities of plastic deformations in femoral screws are calculated. Future developments, which could be associated with different configurations of cancellous screws, nonlinearities, experiments, and applications, are also proposed.

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Section: Discussionmentioning

confidence: 99%

“…The new, simple, deterministic, and stochastic (probabilistic) 2D model of a cancellous screw in the femur as a beam on an elastic bilateral Winkler foundation, along The study of dynamic properties of screws and bone interaction via experiments can also be applied, and screws or their parts can be made of composites as well; see [39].…”

Section: Discussionmentioning

confidence: 99%

Stochastic Strength Analyses of Screws for Femoral Neck Fractures

et al. 2022

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“…Deep drilling is currently used in various industries, such as mechanical engineering, construction, geological surveying, etc. The main task of this technology of drilling is to correctly determine the drilling process parameters and the correct selection of the tool [1,2].…”

Section: State Of the Artmentioning

confidence: 99%

Influence of Coolant Properties and Chip Former Geometry on Tool Life in Deep Drilling

Kočiško,

Pollák,

Grozav

et al. 2023

Applied Sciences

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The aim of the article is to find a correlation between a change in the properties of the cooling agent and a change in the geometry of the chipformer, as both are reflected in the service life of the tool after deep drilling. The reason for carrying out the research is the requirement of practice to obtain the economic efficiency of the production of such a demanding process as deep drilling. When applying the latest designs of gun drills, it is very important to correctly set the technological parameters to maintain the stability of the cutting process. One of the most important parameters is the correct removal of heat from the cutting site, and this will be ensured by the stability of pressure, temperature, and percentage of emulsion in the cooling medium, as well as the adjustment of the geometry of the chip former. On this basis, a large number of tests were carried out, consisting of testing the number of drilling cycles carried out by new, unfluted gun drills at constant feed rates and spindle rotation frequencies. After testing, it is possible to modify and supplement the existing methodology of deep drilling technology in terms of managing the cooling emulsion and chip-forming geometry. The tests were aimed at increasing the service life and the number of possible re-grindings of the gun drills depending on changes in the percentage of the emulsion concentration, the pressure and temperature of the cooling agent, and the associated chipformer geometry.

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“…In the development of the field of polymer composites, researchers have focused on testing different volume fractions of individual composite constituent phases, filler sizes, and their optimum compositions (more in [ 16 , 17 , 18 ]). 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 ].…”

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

Cited by 4 publications

References 31 publications

Stochastic Strength Analyses of Screws for Femoral Neck Fractures

Stochastic Strength Analyses of Screws for Femoral Neck Fractures

Influence of Coolant Properties and Chip Former Geometry on Tool Life in Deep Drilling

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

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