Wednesday  |  Carnegie III  |  05:00 PM–05:20 PM

#13892, The Effect of Aging on Delamination Strength Utilizing an Embedded Digital Image Correlation Scheme

We utilize an in-situ/embedded digital image correlation (DIC) technique to evaluate the effect of natural aging on interface delamination strength on an idealized model system. The system consists of a single ~500-650 μm glass bead inclusion at the center of a Sylgard 184 dog-bone tensile sample along with an embedded DIC speckle pattern at the midplane of the sample. The speckle pattern enables the measurement of the evolving strain field in the region surrounding the embedded glass bead while the sample undergoes a tensile load to failure. During the tensile loading of the sample, the applied stresses at the particle-binder interface force a debonding event to occur before the ultimate tensile failure of the sample. The measured strain field at the moment of the forced debonding event is then utilized to characterize the localized stress required to induce a failure at the interface. Through repetition of the experiment, the debonding behavior can be described in a statistically meaningful fashion. This approach is then extended to capture the effect of natural aging on the delamination behavior through a time period of approximately 24 days.

Tomislav Kosta   U.S. Air Force Research Laboratory
Jesus Mares Jr.   U.S. Air Force Research Laboratory
Marcel Hatter   University of Dayton Research Institute
Brett Resue   University of Dayton Research Institute
Claron Ridge   U.S. Air Force Research Laboratory