Issue 68

V. O. Alexenko et alii, Frattura ed Integrità Strutturale, 68 (2024) 390-409; DOI: 10.3221/IGF-ESIS.68.26

PEI/CF-fabric ratio

USW duration, ms

23/77

30/70

43/57

400 500 600 700 800

41.9 48.7 46.6 47.5 44.6

44.5 47.6 39.0 37.5 36.1

12.7 16.1 16.5 21.0

28.6 Table 2: Tensile strength levels for different USW duration vs PEI/CF-fabric ration combinations.

PEI/CF-fabric ratio

USW duration, ms

23/77

30/70

43/57

400 500 600 700 800

0.10 0.13 0.12 0.13 0.15

0.05 0.11 0.11 0.12 0.15

0.04 0.05 0.11 0.15

0.21 Table 3: The USW lap-joint thinning values for different USW duration vs PEI/CF-fabric ration combinations.

PEI/CF-fabric ratio

USW duration, ms

23/77

30/70

43/57

400 500 600 700 800

0

+0

-50

-50

-40 -20

-100 -150 +20

+50 +80

+40 +80

+140 +120 Table 4: Mean changes in the ‘CF-fabric layer’ thickness for different USW duration vs PEI/CF-fabric ratio combinations.

φ

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

σ , MPa

t

φ

t УЗ

0 010203040506070809 1 0

a)

b) Figure 11: The tensile strength vs USW duration dependences.

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