Issue 48

F.A.L. Viana et alii, Frattura ed Integrità Strutturale, 48 (2019) 286-303; DOI: 10.3221/IGF-ESIS.48.29 302 behaviour of the joints was highly dependent on the adhesive type and L O , and this was conveniently explained by a stress analysis. The brittle Araldite ® AV138 was only competitive for short L O due to high peak stresses, whilst less strong but more ductile adhesives gradually gain ground by increasing L O due to their plasticization ability. The DLJ showed a significantly improved behaviour over the SLJ, although these were affected by adherends’ yielding, which limited P m for some joint configurations. The validation process showed accurate P m predictions for the Araldite ® AV138 and 2015, whilst the P m predictions for the Sikaforce ® 7752 overshot the experimental results. A detailed analysis revealed that this was due to using a triangular CZM law, which in this case is not the most adequate. As a main conclusion, the inverse CZM parameter identification showed to be a valid an accurate technique for not too ductile adhesives, for which a different CZM law shape could provide a good solution. A CKNOWLEDGMENTS he authors would like to thank Sika ® Portugal for supplying the adhesive. R EFERENCES [1] Petrie, E.W. (1999). Handbook of adhesives and sealants. 2nd ed ed. New York: McGraw-Hill. [2] Brockmann, W., Geiß, P.L., Klingen, J., Schröder, K.B., Mikhail, B. (2008). Adhesive Bonding: Materials, Applications and Technology: Wiley. [3] da Silva, J.F.M.G., Öchsner, A., Adams, R.D. (2011). Handbook of Adhesion Technology. Heidelberg: Springer. [4] Adams, R.D. (2005). Adhesive Bonding, Science, technology and applications. Cambridge England: Woodhead Publishing. [5] Ávila, A.F., Bueno, P.n.d.O. (2004). Stress analysis on a wavy-lap bonded joint for composites. International Journal of Adhesion and Adhesives.24, pp. 407-414. DOI: 10.1016/j.ijadhadh.2003.12.001. [6] Volkersen, O. (1938). Die nietkraftoerteilung in zubeanspruchten nietverbindungen konstanten loschonquerschnitten. Luftfahrtforschung.15 pp. 41-47. [7] Barenblatt, G.I. (1959). The formation of equilibrium cracks during brittle fracture. General ideas and hypotheses. Axially-symmetric cracks. Journal of Applied Mathematics and Mechanics.23, pp. 622-636. DOI: 10.1016/0021-8928(59)90157-1. [8] Dugdale, D.S. (1960). Yielding of steel sheets containing slits. J Mech Phys Solids.8, pp. 100-4. DOI: 10.1016/0022-5096(60)90013-2. [9] da Silva, L.F.M., Campilho, R.D.S.G. (2012). Advances in Numerical Modelling of Adhesive Joints. Advances in Numerical Modeling of Adhesive Joints: Springer Berlin Heidelberg, pp. 1-93. [10] Rocha, R.J.B., Campilho, R.D.S.G. (2018). Evaluation of different modelling conditions in the cohesive zone analysis of single-lap bonded joints. J Adhesion 94, pp. 562-582. DOI: 10.1080/00218464.2017.1307107. [11] Pandya, K.C., Williams, J.G. (2000). Measurement of cohesive zone parameters in tough polyethylene. Polymer Engineering & Science 40, pp. 1765-1776. DOI: 10.1002/pen.11308. [12] da Silva, L.F.M., Campilho, R.D.S.G. (2012). Advances in numerical modelling of adhesive joints. Heidelberg: Springer. [13] Xu, Y., Guo, Y., Liang, L., Liu, Y., Wang, X. (2017). A unified cohesive zone model for simulating adhesive failure of composite structures and its parameter identification. Composite Structures.182, pp. 555-565. DOI: 10.1016/j.compstruct.2017.09.012. [14] Azevedo, J.C.S., Campilho, R.D.S.G., da Silva, J.F.G., Faneco, T.M.S., Lopes, R.M. (2015). Cohesive law estimation of adhesive joints in mode II condition. Theor Appl Fract Mec.80, pp. 143-154. [15] Bouhala, L., Makradi, A., Belouettar, S., Younes, A., Natarajan, S. (2015). An XFEM/CZM based inverse method for identification of composite failure parameters. Computers & Structures.153, pp. 91-97. DOI: 10.1016/j.compstruc.2015.02.035. [16] Campilho, R.D.S.G., Banea, M.D., Pinto, A.M.G., da Silva, L.F.M., de Jesus, A.M.P. (2011). Strength prediction of single- and double-lap joints by standard and extended finite element modelling. Int J Adhes Adhes. 31, pp. 363-372. DOI: 10.1016/j.ijadhadh.2010.09.008. T