88 T. Kosta and J. O. Mares Jr. adhesion strength, which allows for specific interrogation of surface modifications or binder additives targeted to increase adhesion. It is also suggested that this technique can be extended for use with non-transparent binders through the use of X-ray interrogation. 11.4 Conclusion We have presented a methodology to characterize the debonding behavior between a binder and a material of interest. This was accomplished by extending an experiment conducted by Gent and Park [5] by incorporating Digital Image Correlation to obtain an in situ planar strain field measurement near the debonding event. We have successfully demonstrated that the strain information of the binder material surrounding a single particle leading up to and through a debonding event can be measured as a function of applied load. The strain field measurements allow for the characterization of interface strength as well as provide data useful to parameterize and validate computational models. Through experimental repetition over a large number of samples, distributions of debonding strength can be obtained for a given binder and particle material. Additionally, it is suggested that the method can be extended to investigate non-transparent binder materials through the use of X-ray interrogation. This technique is well-suited to quantify the effect of subtle changes in the adhesion at the particlebinder interface due to surface modification or the addition of surfactants. Acknowledgments DISTRIBUTION A. Approved for public release; distribution unlimited. 96TW-2020-0040. This work was supported by research grant 17RWCOR469 from the Air Force Office of Scientific Research; Program Officer Dr. Martin Schmidt. References 1. ASTM D4541-17: Standard Test Method for Pull-Off Strength of Coatings Using Portable Adhesion Testers. ASTM International, West Conshohocken (2017) 2. ASTM D1876-08(2015)e1: Standard Test Method for Peel Resistance of Adhesives (T-Peel Test). ASTM International, West Conshohocken (2015) 3. ASTM D6900-10(2015): Standard Test Method for Wet Adhesion of Latex Paints to a Gloss Alkyd Enamel Substrate. ASTM International, West Conshohocken (2015) 4. Tan, H., Liu, C., Huang, Y., Geubelle, P.H.: The cohesive law for the particle/matrix interfaces in high explosives. J Mech Phys Solids. 53(8), 1892–1917 (2005) 5. Gent, A., Park, B.: Failure processes in elastomers at or near a rigid spherical inclusion. J Mater Sci. 19(6), 1947–1956 (1984) 6. Lauke, B.: Determination of adhesion strength between a coated particle and polymer matrix. Composites Science and Technology. 66(16), 3153–3160 (2006) 7. Lauke, B.: Stress field calculation around a particle in elastic–plastic polymer matrix under multiaxial loading as basis for the determination of adhesion strength. Composite Interfaces. 23(1), 1–14 (2016) 8. Chu, T., Ranson, W., Sutton, M.A.: Applications of digital-image-correlation techniques to experimental mechanics. Experimental mechanics. 25(3), 232–244 (1985)
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