Experimental assessment of stiffness and energy dissipation properties of disk-shaped polymer-based composite specimens by in-plane torsion testing

Cosco, Francesco; Serratore, Giuseppe; Catera, Piervincenzo Giovanni; Gagliardi, Francesco; Luberto, Eduardo; Mundo, Domenico

doi:10.1016/j.polymertesting.2020.106351

Cited by 2 publications

(3 citation statements)

References 22 publications

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“…The experimental setup, derived from the one used in the literature [20] for DMA-based tests, is shown in Figure 1, and consists of a steel structure designed to enable the in-plane vibration excitation of the specimen by impact hammer modal testing. The proposed experimental methods rely on the following equipment: Impact hammer modal testing is a commonly used method in the field of vibration analysis, enabling the measurement of FRFs of a vibrating structure.…”

Section: Impact Hammer Modal Testing Equipmentmentioning

confidence: 99%

“…Besides the well consolidated approach based on exploiting the dynamic mechanical analysis (DMA) [19][20][21], the feasibility of assessing the damping properties through vibration analysis has been recently demonstrated [22][23][24]. V. Anes et al [22] investigated the torsional and axial damping properties of a bar-extruded AZ31B-F magnesium alloy, considering both hysteretic and viscous damping with stress-strain-controlled tests and free vibration analyses.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Cosco et al proposed a dedicated testing setup [20], relying on the DMA approach for the experimental assessment of the stiffness and energy dissipation properties of disk-shaped polymer-based composite specimens by in-plane torsion testing. This paper complements the experimental findings presented in reference [22], with an improved apparatus and a novel approach to evaluate the torsional damping of CFRP specimens using vibration analysis.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Characterization of the Torsional Damping in CFRP Disks by Impact Hammer Modal Testing

et al. 2020

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Composite materials are widely used for their peculiar combination of excellent structural, mechanical, and damping properties. This work presents an experimental study on the dissipation properties of disk-shaped composite specimens exploiting vibration tests. Two different polymer matrix composites with the same number of identical laminae, but characterized by different stacking sequences, namely unidirectional and quasi-isotropic configurations, have been evaluated. An ad-hoc steel structure was designed and developed to reproduce an in-plane torsional excitation on the specimen. The main idea of the proposed approach relies on deriving the damping properties of the disks by focusing on the modal damping of the overall vibrating structure and, in particular, using just the first in-plane torsional deformation mode. Experimental torsional damping evaluations were conducted by performing vibrational hammer excitation on the presented setup. Two methods were proposed and compared, both relying on a single-degree-of-freedom (SDOF) approximation of the measured frequency response function (FRF).

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Section: Impact Hammer Modal Testing Equipmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Characterization of the Torsional Damping in CFRP Disks by Impact Hammer Modal Testing

et al. 2020

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Design of a Spin Test System for Burst Phenomen Considering Nonlinear Rotordynamic Effects

Uğur,

Kopmaz

2024

Applied Sciences

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This study presents the development and evaluation of a spin test rig for high-speed rotating components. The innovation of this study is using a discrete model to determine dynamic positioning during the preliminary design phase based on vibration characteristics. The primary aim is to manage vibrations and alternating stress effects from rotor dynamics to prevent issues such as crack propagation or bursts before achieving desired speeds. MATLAB 2023b Simulink-based tool was developed, which played a role in providing the design of bearing support regions and stiffness values. The system underwent rigorous validation through structural, modal, and harmonic finite element analyses. Testing showed a maximum deviation of 4.2% for 10 kg specimen and 4.85% for 4 kg specimen between Simulink predictions and actual data, due to factors such as contact and bearing damping. For the 10 kg specimen, the maximum equivalent stress was 314.92 MPa with an alternating stress of 64.87 MPa at 0.5% damping ratio, representing 37.27% of the yield limit. For the 4 kg specimen, the maximum equivalent stress was 513 MPa with alternating stress below 40 MPa at 3% damping ratio, corresponding to 54.32% of the yield limit. This research enhances the reliability and performance of high-speed rotating machinery.

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Experimental assessment of stiffness and energy dissipation properties of disk-shaped polymer-based composite specimens by in-plane torsion testing

Cited by 2 publications

References 22 publications

Experimental Characterization of the Torsional Damping in CFRP Disks by Impact Hammer Modal Testing

Experimental Characterization of the Torsional Damping in CFRP Disks by Impact Hammer Modal Testing

Design of a Spin Test System for Burst Phenomen Considering Nonlinear Rotordynamic Effects

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