Abstract
The dynamics of carbon fiber-reinforced plastic (CFRP) change according to the carbon fiber angle, and a mode order shift may occur in CFRP specimens. The variation trends in modal parameters differ in each mode; thus, an efficient mode-tracking method is needed to identify the reliable dynamic behavior of the CFRP structure. The mode-tracking method was assumed to be applicable for the same configuration of the tested specimen except for the differences in carbon fiber angle of the CFRP specimen. Simple rectangular specimens were prepared for one isotropic material, SS275, and five anisotropic CFRP specimens with five carbon fiber angles ranging from 0° to 90°. An experimental impact test was conducted to obtain all the modal parameters. The proposed mode-tracking method was applied using three indicators: the modal assurance criterion (MAC) and two modal parameters (resonance frequency and modal damping ratio). The MAC value was valid for the three bending modes at 0°, 30°, and 90°, but not for the two torsional modes. However, the variation in the resonance frequencies was a more efficient indicator with which to track all the modes of interest, except for the second torsional mode. The variation in the modal damping ratio was also a valid indicator for the two torsional modes. Therefore, the proposed three indicators were all required to derive reliable mode tracking for the CFRP specimens considering the mode order shift.
Highlights
Carbon fiber-reinforced plastic (CFRP) materials are widely used in many industries, owing to their superior strength-to-weight ratio (SWR) compared to conventional steel materials
The effects of the three parameters, carbon fiber angle, temperature, and spectral loading pattern, on CFRP materials were investigated using a uniaxial excitation test for simple rectangular specimens [22,23,24]. Both the resonance frequency and modal damping ratio were obtained from the representative frequency response functions (FRFs), and the variations in the two modal parameters were discussed based on the different carbon fiber angles
We proposed a mode-order tracking method for CFRP specimens with five different carbon fiber angles by using three indicators: modal assurance criterion (MAC) value and two modal parameters
Summary
Carbon fiber-reinforced plastic (CFRP) materials are widely used in many industries, owing to their superior strength-to-weight ratio (SWR) compared to conventional steel materials. The effects of the three parameters, carbon fiber angle, temperature, and spectral loading pattern, on CFRP materials were investigated using a uniaxial excitation test for simple rectangular specimens [22,23,24]. Both the resonance frequency and modal damping ratio were obtained from the representative frequency response functions (FRFs), and the variations in the two modal parameters were discussed based on the different carbon fiber angles. The novelty of this study is the use of the mode tracking method for the highly sensitive CFRP structure over the carbon fiber angle using three indicators, namely the variation in resonance frequency, the modal damping ratio, and the MAC value. The sensitivity results may change if the configuration of the specimen changes from the study case
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