Issue 71

L. Varghese et alii, Fracture and Structural Integrity, 71 (2025) 49-66; DOI: 10.3221/IGF-ESIS.71.05

Ep/AS-C/5 shows 8 % higher than Ep/AS-C/20. Ep/AS-C/10 and Ep/AS-F/10 have natural frequencies of 30, and 28 Hz, which is 36.36,27.27 % higher than the control specimen, which is 22 Hz. Similarly, Ep/AS-VF/10 has a 28 Hz natural frequency, which is again 27.27% higher than the control specimen; this should be due to the optimum bonding in the Ep/AS-VF series.

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Figure 13: (a) Experimental setup (b) control specimen time-frequency of composites.

Damping factor of particulate composites The graph in Fig. 14 (a) is used to find damping factor values using the half-power bandwidth method. This figure shows how to find the half-power points by seeing where the line crosses the Frequency Response Function (FRF) curve. A is the

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