PSI - Issue 25

Angelika Wronkowicz-Katunin et al. / Procedia Structural Integrity 25 (2020) 13–18 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

18

6

the test, before opening of the initial crack. In order to overcome the decohesion of hinges during tests it is recommended to use similar adhesive as the adhered material (the polymer of the composite’s matrix), an d, if possible, excess the adhesive over the holes of hinges tabs. • Registration of the results during the fracture toughness tests – in order to fulfil the requirements of the procedures of testing according to (Standard, 2013) the accuracy of monitoring of the delamination propagation can be significantly improved by using two cameras on both sides of the specimen, which are synchronized with each other as well as with the testing machine. The recordings should be carefully analyzed frame by frame in order to determine the delamination propagation lengths. This allows for a more precise determination of the delamination length and its connection with the loading force, which sufficiently minimizes measurement errors during the determination of load-displacement curves necessary for the calculation of the critical energy release rate.

Acknowledgements

The results presented in this paper were obtained within the framework of research grant No. 2017/25/N/ST8/01009 financed by the National Science Centre, Poland.

References

Bin Mohamed Rehan, M.S., Rousseau, J. Fontaine, S., Gong, X.J., 2017. Experimental study of the influence of ply orientation on DCB mode-I delamination behavior by using multidirectional fully isotropic carbon/epoxy laminates. Composite Structures 161, 1-7. Franklin, V. A., Christopher, T., 2013. Fracture energy estimation of DCB specimens made of glass/epoxy: an experimental study. Advances in Materials Science and Engineering 2013, 412601. Heidari-Rarani, M., Shokrieh, M.M., Camanho, P.P., 2013. Finite element modeling of mode I delamination growth in laminated DCB specimens with R-curve effects. Composites: Part B 45, 897-903. Hufenbach, W., Hornig, A., Gude, M., Böhm, R. , Zahneisen, F., 2013. Influence of interface waviness on delamination characteristics and correlation of through-thickness tensile failure with mode I energy release rates in carbon fibre textile composites. Materials and Design 50, 839-845. Mouritz, A., P., 2012. Chapter 19 - Fracture Toughness Properties of Aerospace Materials , in “ Introduction to Aerospace Materials ” . Woodhead Publishing. Pawłowski, R., 2019. Determination of mechanical properties of composite materials during static tensile and compression tests. Performing DCB (Dual Cantilever Beam) tensile testing. Report no. CL/02a/04/2019, Silesian Science and Technology Centre for Aviation Industry Ltd., Czechowice-Dziedzice, Poland. Shokrieh, M. M., Heidari-Rarani, M., Ayatollahi, M.R., 2012. Delamination R-curve as a material property of unidirectional glass/epoxy composites. Materials and Design 34, 211-218. Simon, I., Banks-Sills, L., Fourman, V., 2017. Mode I delamination propagation and R-ratio effects in woven composite DCB specimens for a multi-directional layup. International Journal of Fatigue 96, 237-251. Standard PN-EN ISO 527-4, 2000. Plastics – Determination of tensile properties – Part 4: Test conditions for isotropic and orthotropic fibre reinforced plastic composites. Polish Committee for Standardization, Warsaw. Standard ASTM D3410/D3410M-16, 2016. Standard test method for compressive properties of polymer matrix composite materials with unsupported gage section by shear loading. ASTM International, West Conshohocken, PA. Standard ASTM D5528-13, 2013. Standard test method for mode I interlaminar fracture toughness of unidirectional fiber-reinforced polymer matrix composites. ASTM International, West Conshohocken, PA. Standard ASTM E132-17, 2017. Standard test method for P oisson’s ratio at room temperature . ASTM International, West Conshohocken, PA.