Abstract
The dynamic properties of carbon-fiber-reinforced plastic (CFRP) can be efficiently estimated through a modal damping coefficient and a resonance frequency, and the modal parameters can be calculated using a frequency response function (FRF). The modal parameters used in an CFRP FRF are influenced by the carbon fiber direction, temperature, and spectral loading pattern, as well as the operating conditions. In this study, three parameters—temperature, spectral loading pattern, and carbon fiber direction—were selected as the influential factors for CFRP dynamics, and the sensitivity index formulation was derived from the parameter-dependent FRF of the CFRP structure. The derivatives of the parameter-dependent FRF over the three considered parameters were calculated from the measured modal parameters, and the dynamic sensitivity of the CFRP specimens was explored from the sensitivity index results for five different directional CFRP specimens. The acceleration response of a simple CFRP specimen was obtained via a uniaxial excitation test at temperatures ranging from −8 to 105 °C for the following two spectral loading cases: harmonic and random.
Highlights
Carbon-fiber-reinforced plastic (CFRP) can be used as an excellent lightweight replacement for steel in mechanical industries [1,2,3,4,5] due to its outstanding specific strength characteristics [6,7,8,9,10,11], as well as its sound damping characteristics [12,13,14,15,16,17]
The dynamic response of a carbon-fiber-reinforced plastic (CFRP) structure varies with the changes in structural stiffness with respect to the direction of the carbon fiber; CFRP is anisotropic in nature due to the different orientations of the carbon fiber [18,19,20,21,22,23,24]
In some previous studies [22,28,29], sensitivity to the frequency response function (FRF) was assessed according to different carbon fiber directions and specific loading patterns to evaluate the dynamic properties of CFRP
Summary
Carbon-fiber-reinforced plastic (CFRP) can be used as an excellent lightweight replacement for steel in mechanical industries [1,2,3,4,5] due to its outstanding specific strength characteristics [6,7,8,9,10,11], as well as its sound damping characteristics [12,13,14,15,16,17]. In some previous studies [22,28,29], sensitivity to the FRF was assessed according to different carbon fiber directions and specific loading patterns to evaluate the dynamic properties of CFRP. Previous studies have revealed that the dynamics of CFRP specimens are highly sensitive to the three parameters of interest: temperature, loading pattern, and carbon fiber direction. The investigation of the dynamics of CFRP was extended to consider all three parameters—temperature, loading pattern, and carbon fiber direction—and the variations in modal parameters, i.e., the resonance frequency and damping coefficient, were evaluated using the sensitivity index of the FRF of the CFRP specimen. The FRFs were calculated using the measured data and modal parameters of the CFRP specimen Both the resonance frequency and the damping coefficient were estimated from these FRFs
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