Abstract
In this paper results of experimental analysis of elastic guided wave mode conversion phenomenon in glass fibre reinforced polymers GFRP are presented. Results of research presented in this paper are strictly focused on S0/A0' mode conversion caused by discontinuities in the form of circular teflon insert simulating damage and impact damage. Experimental research is based on non-contact elastic wave sensing with utilisation of scanning laser Doppler vibrometer SLDV and full wave-field measurements. In presented research influence of location of circular teflon insert on S0/A0' mode conversion is investigated. Teflon inserts were located between layers of composite material at different depth. Moreover influence of impact damage with different energy on S0/A0' mode conversion is investigated. Analysis of influence of investigated discontinuities on S0/A0' mode conversion are based on the elastic wave mode filtration in frequency-wavenumber domain. Mode filtration process allows to remove effects of unwanted type of mode propagation in forward or backward direction. Effects of S0/A0' mode conversion are characterise by mode conversion indicator based on amplitude of new mode A0'.
Highlights
Structural Health Monitoring (SHM) is more and more attracted attention of many researchers
Application of SHM systems allows to reduce the number of unexpected maintenance and service operation related to structural degradation of exploited structure
Among many diagnostic techniques that could be utilized in SHM very popular is guided wave propagation method. It is based on propagation of elastic waves that are guided in structural elements
Summary
Structural Health Monitoring (SHM) is more and more attracted attention of many researchers. There is still limited number of works related to the analysis of elastic waves mode conversion phenomenon especially for composite structures. This topic was investigated by authors of work [2] where the effect of continuous mode conversion in CFRP plate were analyzed. Authors of work [9] analyzed the mode conversion phenomenon for teflon insert located symmetrically in respect to the thickness of composite panels. Experimental results presented in this paper indicated that in the case of teflon insert symmetrically located (the same number of plies above and below the insert) mode conversion S0/A0’ was noticed. Influence of impact damage with different energies on S0/A0’ mode conversion is investigated
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