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Open AccessArticle

Modal Damping Coefficient Estimation of Carbon-Fiber-Reinforced Plastic Material Considering Temperature Condition

1
Rail&Vehicle Technology Team, Smart Manufacturing Innovation Center, #8, Jisiksaneop5-ro, Hayang-eup, Gyeongbuk 38408, Korea
2
Department of Mechanical Design Engineering, Pukyong National University, 45 Yongso-ro, Nam-gu 48513, Korea
3
Department of Fiber System Engineering, Yeungnam University, Gyeongsansi, Gyeongsanbokdo 38541, Korea
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(12), 2872; https://doi.org/10.3390/ma13122872
Received: 1 June 2020 / Revised: 21 June 2020 / Accepted: 24 June 2020 / Published: 26 June 2020
Excellent mechanical properties of carbon-fiber-reinforced plastic material (CFRP) demonstrates many possibilities in industries using lightweight materials, but unlike isotropic materials, such as iron, aluminum, and magnesium, they show direction-sensitive properties, which makes it difficult to apply for them. The sensitivity of a modal damping coefficient of a CFRP material over the direction of carbon fiber was examined on spectral input patterns in recent research, but the effect of temperature was not considered up to now. To overcome this, uniaxial vibration tests were conducted using five simple specimens with different direction of carbon fiber in a CFRP specimen, the frequency response functions were experimentally determined and the modal damping coefficients were calculated. It was revealed that the resonance point and the modal damping of the specimen changed according to the change in temperature condition. Based on the experimental results, it was demonstrated that the theoretical frequency response function of the carbon composite material is a function of temperature, and it was confirmed that the nonlinear characteristic of the modal damping was the smallest under the 0 degree of direction of carbon fiber. View Full-Text
Keywords: modal damping coefficient; temperature condition; direction of carbon fiber; resonance frequency; carbon-fiber-reinforced plastic material modal damping coefficient; temperature condition; direction of carbon fiber; resonance frequency; carbon-fiber-reinforced plastic material
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MDPI and ACS Style

Kang, H.-Y.; Kim, C.-J.; Lee, J. Modal Damping Coefficient Estimation of Carbon-Fiber-Reinforced Plastic Material Considering Temperature Condition. Materials 2020, 13, 2872.

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