Abstract
For soft adhesives, a Rigid Double Cantilever Beam (RDCB) experiment has recently been shown to be a convenient way for extracting traction-separation (σ-δ) relationships. An implicit expression of the σ-δ relationship is derived by Brock et al. (J. Adhesion, 2018) assuming small rotation of the beams and a linear traction separation relationship in the compressive zone. In this work, an explicit expression of the σ-δ relationship for a Rigid Double Cantilever beam (RDCB) for large deformation of the adhesive including the effect of a compressive zone ahead of the cohesive zone is used for direct extraction of σ-δ relationship. The expression for the σ-δ relationship is in terms of quantities that can be directly measured using the full-field deformation measurement technique, StereoDIC. Using RDCB analysis, the traction at the Sylgard 184-aluminum interface where adhesive failure occurs is obtained by simultaneous measurement of separation of the adherends at the crack tip, separation at the end of the compressive zone (far end of the beam ahead of the crack tip) and load. The true separation of the crack surfaces at the interface is obtained by measuring δ, the relative displacement of two points separated by 0.05 mm across the interface. It is shown that the compressive zone in the adhesive has a significant effect on the σ-δ relationship. The maximum traction and maximum separation are found to be 0.33 MPa and 5.5 μm respectively. The energy release rate obtained by calculating the area under the σ-δ curve is 1.13 J/m2.KeywordsRigid Double Cantilever beamTraction-separationCohesive zoneSoft adhesiveSylgardStereoDIC
Published Version
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