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Table 2 Resonance frequencies obtained by experimental tests for Model 1 and Model 3

From: Experimental analyses of metal-composite bonded joints: damage identification

  Mode ω1[Hz] ω2[Hz] ω3[Hz] ω4[Hz] ω5[Hz] ω6[Hz]
Model 1 H 12 33.44 81.25 135.9 208.1 313.4 416.9
H 13 33.75 79.69 125.9 205.0 292.2 412.5
Model 3 H 12 33.13 84.38 139.1 211.9 318.1 423.1
H 13 33.13 81.88 124.1 212.5 296.3 418.8
Δ (*) : H 12 0.93% 3.85% 2.35% 1.83% 1.50% 1.49%
Δ (*) : H 13 1.84% 2.75% 1.43% 3.66% 1.40% 1.53%
  1. *Δ = |H(M1) – H(M3)| / H(M1).