Detecting Damage in Carbon Fibre Composites using Numerical Analysis and Vibration Measurements

Moustafa, Essam B.; Almitani, Khalid H.

doi:10.1590/1679-78256294

Cited by 7 publications

(9 citation statements)

References 36 publications

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“…All samples were analyzed using an average of five samples for each alloy. In order to calculate the damping ratio (ζ), the first resonant frequency (F n ), and the dynamic modulus (E d ), the following equations were used depending on the free vibration decay curves of a cantilever beam (Moustafa, 2018;Ahmed et al, 2021;Moustafa and Almitani, 2021).…”

Section: Methodsmentioning

confidence: 99%

The influence of the modifying elements on the microstructure, mechanical, and deformation properties of aluminum alloys

et al. 2022

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In the current work, the standard A242 aluminum cast alloy is modified using the stir casting method with titanium (Ti) (0.5% wt.) and boron (B) (0.1% wt.) modifiers. Polarized optical and scanning electron microscopy were utilized to examine the A242 base microstructure, and A242 + TiB modified alloys; the results revealed that the modified A242 + TiB alloy was refined by 13.5 times more than the as-cast alloy. The mechanical properties were investigated experimentally using compression test in addition to the hardness test; the results revealed that the ultimate compressive strength of the A242 + TiB modified alloy was increased by 9.0% more than those of the A242 standard alloy. Moreover, the yield stress was enhanced by 40% at room temperature and 20% at 250 °C. The dynamic properties were studied using a free vibration impact test to study the modifiers’ effect on the dynamic behavior. The grain refinement notably impacted the damping capacity; due to the as-cast inhomogeneity, the conventional alloy A242 exhibited a greater FRF than the modified alloy A242 + TiB. The modified alloy displayed fewer resonance peaks due to grain refinement and excellent intermetallic phase distribution. The simulation process of the investigated alloys was performed using ABAQUS finite element software to predict the deformation behavior under different temperatures. The FE results showed that the modified alloy was more resistant to deformation by 9.1% than the reference alloy, A242, at room temperature and 7.6% at 250 °C, which agreed with the experimental findings.

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Section: Methodsmentioning

confidence: 99%

The influence of the modifying elements on the microstructure, mechanical, and deformation properties of aluminum alloys

et al. 2022

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“…A logarithmic decrement, Equations ( 1) and ( 2), were used to compute the damping ratio (ζ). The quality factor (Q) is obtained from Equation (3) [24,34]. Figure 3 shows the principal idea in which the logarithmic decrement is calculated from the time-domain graph.…”

Section: Determination Of the Natural Frequency And Damping Ratio By Experimentsmentioning

confidence: 99%

“…The methods used to identify the dynamic properties of the metals and the role of reinforcement elements to enhance the structural properties were investigated in many works of literature [24,25]. The most simple and accurate method is the free vibration test, which depends on the excitation of the structure to obtain the dynamic properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of Grain Refinement on the Dynamic, Mechanical Properties, and Corrosion Behaviour of Al-Mg Alloy

Ahmed

Hefni

et al. 2021

Metals

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In this investigation, aluminium Al-2.5% Mg cast alloy was modified by adding 0.5 Ti and 0.1 B wt % modifiers to investigate their impact on the dynamic behaviour, as well as the mechanical and microstructure properties. The dynamic properties were analysed experimentally using a free vibration impact test and predicted using finite element methods. This study used a high-resolution polarised optical microscope to analyse the microstructure of the studied alloys and X-ray Powder Diffraction (XRD) analysis to determine the developed phases. Microstructure and mechanical properties were mostly enhanced as a result of grain refining during solidification and through the metal segregation process. The microstructure analysis of the modified alloy showed a significant improvement in the grain refinement; hence, the grains were 10 times finer than the cast alloy. The modified Al-2.5% Mg/Ti-B alloy demonstrated reduced inter-granular corrosion (IGC) than the Al-2.5% Mg standard cast alloy. By incorporating Ti-B modifiers into the composition of the cast Al-Mg alloy, the ultimate tensile strength (UTS), strain (ε), and hardness values (HV) were increased by 30.5%, 100%, and 18.18%, respectively. The dynamic properties of the modified alloy showed an enhancement in the resonant (fn) and damping ratio (ζ) by 7% and 68%, respectively. The predicted resonance frequencies of the investigated alloys showed results close to the experimental dynamic tests.

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“…The dynamic behavior of the UFSC panel system was investigated concerning vibrations induced by human movements such as walking and jumping. The free vibration of composite structures is widely used to characterize the dynamic properties [28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

The Dynamic and Flexural Behavior of Coated GFRP Rebars after Exposure to Elevated Temperatures

2022

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The dynamic and flexural behavior of pultruded glass fiber reinforced polymer GFRP rebars were investigated after exposure to elevated temperatures ranging from room temperature to 290 °C. The rebars were cut and grouped into two sets. The first set contained the uncoated specimens, and the second set enclosed the specimens that had been coated with a gun-sprayed thin layer of silicon matrix mixed with ceramic nanoparticles as an insulation medium. All specimens’ dynamic and flexural performances were experimentally performed after heating them inside the oven for 6 h and later cooled down outside the oven at room temperature for 24 h. The dynamic results of the coated specimens showed slight changes in the damping ratio due to the effectiveness of the coating layer. In contrast, the uncoated specimens showed a gradual increase in the damping ratio ranging from 12.5% to 43.1%. Similarly, the tested flexural strength of the coated specimens provided slight changes within the elevated temperatures, while the uncoated specimens showed a gradual decrease ranging from 3.9% to 6.4%.

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Detecting Damage in Carbon Fibre Composites using Numerical Analysis and Vibration Measurements

Cited by 7 publications

References 36 publications

The influence of the modifying elements on the microstructure, mechanical, and deformation properties of aluminum alloys

The influence of the modifying elements on the microstructure, mechanical, and deformation properties of aluminum alloys

Effect of Grain Refinement on the Dynamic, Mechanical Properties, and Corrosion Behaviour of Al-Mg Alloy

The Dynamic and Flexural Behavior of Coated GFRP Rebars after Exposure to Elevated Temperatures

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