Abstract
The failure hyperelastic structural sealant joints is a fracture mechanics problem. Its modeling requires knowledge of the material property fracture toughness. The present work describes a methodology for determining the mode I bulk material fracture toughness of structural silicone sealants. The concept is demonstrated using DOWSIL™ 993 as an example. In total we manufactured, tested and evaluated 13 DCB specimens of 6 mm and 12 mm adhesive thickness. The fracture toughness is identified from J-integral measurements. The theory for determining the J-integral at finite deformations is laid out and an automated data analysis procedure is suggested. The presented approach further allows for determining traction-separation laws to be used in cohesive zone models formulated with respect to the reference configuration. The theory and methodology presented are applicable to arbitrary hyperelastic structural sealants and adhesives. For DOWSIL™ 993 we determined a mode I bulk material fracture toughness of Gc=4.22±0.60 N/mm independent of adhesive layer thickness.
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