PSI - Issue 33

Sergey Smirnov et al. / Procedia Structural Integrity 33 (2021) 259–264 Author name / Structural Integrity Procedia 00 (2019) 000–000 5 complex stress state. In the normalized coordinates � � � � �∗ , � � � � ∗ � the fracture locus has a generalized form in Fig. 2, b. Note that the linear failure criterion similar to (6) is used to predict crack propagation conditions, but with energy release rate G used instead of strain energy density (see, e.g., Lucas F. M. da Silva (2006)). 263

a

b

Fig. 2. Diagrams of the ultimate strain energy density in adhesive failure (a) and a graphical representation of the adhesive failure criterion (b)

4. Conclusion Experiments with modified Arcan device have been made with the variation of the load application angle. It has been demonstrated that this method is applicable to estimating the effect of the stress state, that the experimental data are repeatable, and that the degree of data dispersion does not exceed 10% for the most part. The analysis of the results has enabled us to formulate a linear failure criterion, which takes into account the balance between the characteristics of the elastic properties of the adhesive and the substrate, and to plot a diagram of ultimate adhesive fracture energy. The proposed method can be used for plotting diagrams allowing one to determine a safe stress state, not leading to This study was partially financially supported by the Russian Scientific Foundation (project 19-19-00571) and the IES UB RAS research plan (theme AAAA-A18-118020790145-0). The equipment of the Plastometriya multiple-access center affiliated to the IES UB RAS was used in the experiments. . References Smirnov, S.V., Veretennikova, I.A., Fomin, V.M., Filippov, A.A., Brusentseva, T.A., 2019. Studying the viscoelastic properties of an epoxy resin strengthened with silicon dioxide nanoparticles by instrumented microindentation. Mechanics of Composite Materials 55 (3), 337-348. Barroso, G., Li, Q., Bordia, R. K., Motz, G., 2019. Polymeric and ceramic silicon-based coatings – a review. Journal of Materials Chemistry A 7, 1936-1963. Sharma, R.; Sims, R. A., Mazumder, M. K., 2002. Modification of Surface Properties of Polymeric Materials. Journal of the Arkansas Academy of Science 56, 157-161. Licari, J., 2003. Chemistry and Properties of Polymer Coatings, in “Materials and Processes for Electronic Applications,Coating Materials for Electronic Applications”. William Andrew Publishing, New York, pp.65-200. Campbell, F.C., 2004. Adhesive Bonding and Integrally Cocured Structure: A Way to Reduce Assembly Costs through Parts Integration, in “Manufacturing Processes for Advanced Composites”. Elsevier Science, pp. 241-301. Duncan, B., Crocker, L.. Review of Tests for Adhesion Strength. Technical Report of Project MMS8. National Physical Laboratory Teddington, Middlesex, UK, Dec. 2001. Smirnov, S.V., Veretennikova, I.A., Smirnova, E.O., Pestov, A.V., 2019. Studying the mechanical properties of epoxy adhesive coating by instrumented indentation. AIP Conference Proceedings 2176, 020008 (1-4). adhesive joint failure. Acknowledgements