Influence of Layer Thickness on Cohesive Properties of an Epoxy-Based Adhesive : An Experimental Study

• Cohesive laws are determined for different layer thicknesses of an engineering adhesive. The shape of the cohesive law depends on the adhesive layer thickness. Of  the  two  parameters  of  the  cohesive  law—the  fracture  energy  and  thestrength—the fracture energy is more sensitive to thickness variation than the strength. The fracture energy in peel mode (Mode I) increases monotonically as the thickness is increased from 0.1 to about 1.0 mm. At an adhesive thickness of 1.5 mm, the fracture energy is slightly lower than for a 1.0 mm adhesive thickness, indicating a maximum between 1.0 and 1.5 mm. In shear mode (Mode II), the thickness dependence is not as strong, but an increasing trend in fracture energy with increasing adhesive thickness is evident. A slight decrease in strength with increasing adhesive thickness is found in both loading modes.

Nyckelord

Adhesive joining

Cohesive zone model

Experimental

Fracture

Thickness dependence

Teknik

Technology

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