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

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 2

H 12

33.13

83.44

131.3

209.4

295.6

418.4

H 13

33.13

80.94

117.2

214.4

275.6

418.8

Δ (*) : H 12

0.93%

2.70%

3.38%

0.62%

5.68%

0.36%

Δ (*) : H 13

1.84%

1.57%

6.91%

4.59%

5.68%

1.53%

  1. *Δ = |H(M1) – H(M2)| / H(M1).