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Applied Adhesion Science

Table 2 Results of average initiation, rest state, and G m −G i fracture toughness and crack propagation length for the DCB tests

From: Fracture toughness of adherends bonded with two-part acrylic-based adhesive: double cantilever beam tests under static loading

Specimens

Fracture toughness (Jm−2)

Initiation fracture toughness (Jm−2)

Rest-state fracture toughness (Jm−2)

Difference between maximum and initiation fracture toughness (Jm−2)

Crack propagation length (mm)

G max  = G IC

G i

G r

G m −G i

a m −a i

a r −a m

a r −a i

Aluminum alloy

1071  (195.4)

826.4 (144.9)

843.3 (120.2)

244.3 (95.9)

7.1 (2.9)

3.7 (2.5)

10.7 (2.4)

GF/PP

1438 (271.6)

1185 (270.2)

1059 (179.1)

253 (181.2)

3.1 (2.3)

9.1 (4.5)

12.2 (4.2)

CF/EP

1652 (225.2)

1344 (203.5)

1308  (197.3)

307  (149.7)

4.0 (0.8)

7.5 (5.4)

11.5 (5.6)

  1. The relatively high standard deviation (SD) value for the crack propagation length of the GF/PP specimens was attributed to adherend failure involving weak bonding between the glass fibers and PP. Glass fibers present at various depths from the surface caused a variation in the crack propagation length (a m −a i ) because a crack will stop propagating when it reaches such obstacles
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