Mixed mode I/III fracture behavior of adhesive joints

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:199

Article

Akhavan-Safar, A.¹  Ayatollahi, M. R.²  Safaei, S.²  da Silva, L. F. M.³ 

[1] Inst Sci & Innovat Mech & Ind Engn INEGI, Rua Dr Roberto Frias, P-4200465 Porto, Portugal

[2] Iran Univ Sci & Technol, Ctr Excellence Expt Solid Mech & Dynam, Sch Mech Engn, Fatigue & Fracture Res Lab, Tehran 16846, Iran

[3] Univ Porto, Dept Engn Mecan, Fac Engn, Rua Dr Roberto Frias S-N, P-4200465 Porto, Portugal

关键词: Adhesive joints;    Mixed mode I/III;    Fracture energy;    Out-of-plane crack propagation;    XFEM;   

DOI  :  10.1016/j.ijsolstr.2020.05.007

来源: Elsevier

【 摘 要 】

In this paper, the mixed mode (I/III) fracture behavior of an epoxy based adhesive is investigated using a modified mixed mode I/III apparatus. The fracture tests are performed on adhesively bonded aluminum rectangular specimens with different adhesive thicknesses. Based on the obtained experimental data, the critical stress intensity factors (SIFs) of the adhesive are calculated by performing a 3D finite element analysis (FEA). Then, the fracture energy of modes I and III of the adhesive were extracted using SIFs. To verify the obtained fracture energy, an extended finite element model (XFEM) was employed. The obtained numerical results were in good agreement with the experimental data. It shows that the proposed apparatus can be applied for measuring the mixed mode I/III fracture energy of brittle or semi brittle adhesives where a small scale yielding around the crack tip is observed. The crack propagation path was also analyzed and the out-of-plane angle of crack propagation in the adhesive layer was estimated using XFEM. By comparing the experimental fracture surfaces with the crack propagation path obtained out of the numerical results, it is observed that the XFEM can provide an appropriate estimation of the crack propagation path in adhesive joints under mixed I/III loading. (C) 2020 Elsevier Ltd. All rights reserved.

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