Sensitivity Analysis of the Frequency Response Function of Carbon-Fiber-Reinforced Plastic Specimens for Different Direction of Carbon Fiber as Well as Spectral Loading Pattern

Carbon-fiber-reinforced plastic (CFRP) has been used in many industries owing to its excellent specific-strength characteristics; however, the control of its mechanical properties is difficult owing to the directivity nature of carbon fiber as well as the composition of layered structures. In additi...

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Bibliographic Details
Published inMaterials Vol. 12; no. 18; p. 2983
Main Author Kim, Chan-Jung
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 15.09.2019
MDPI
Subjects
Carbon fiber reinforced plastics
Carbon fibers
Composite materials
Damping
damping coefficient
direction of carbon fiber
Directivity
Frequency response functions
Harmonic excitation
Mathematical analysis
Mechanical properties
resonance frequency
scaled sensitivity index
Sensitivity analysis
Spectra
spectral loading pattern
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Summary:Carbon-fiber-reinforced plastic (CFRP) has been used in many industries owing to its excellent specific-strength characteristics; however, the control of its mechanical properties is difficult owing to the directivity nature of carbon fiber as well as the composition of layered structures. In addition, the damping coefficient of CFRP varies with spectral loading patterns under random and harmonic excitation owing to the high values of damping characteristics compared with conventional steel materials. A scaled sensitivity index was proposed to compare the magnitude of the frequency response function over two parameters of interest: the direction of the carbon fiber and the spectral loading pattern for CFRP specimens. Three specimens with different directions (0°, 45°, and 90°) were prepared and uniaxial excitation testing was conducted for two different spectral loading cases: random and harmonic. The summation of the frequency response was used to calculate the sensitivity index to eliminate the effects of the location of measurement data, and all sensitivity indexes were calculated using the measured responses. Finally, the sensitivity of each CFRP specimen was discussed for two cases, i.e., the direction of carbon fiber and the spectral loading pattern, using the scaled sensitivity index results.
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ISSN:1996-1944
1996-1944
DOI:10.3390/ma12182983