Crack propagation under mode II dominance at stainless steel-epoxy interfaces with residual stresses and micro-scale roughness

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:50

Article

Kanerva, M.¹  Jokinen, J.¹  Sarlin, E.²  Saarela, O.¹ 

[1] Aalto Univ, Sch Engn, Dept Appl Mech, FI-00076 Aalto, Finland

[2] Tampere Univ Technol, Dept Mat Sci, FI-33101 Tampere, Finland

关键词: Interface toughness;    Crack growth;    Bi-material layers;    Atomic force microscopy;   

DOI  :  10.1016/j.ijsolstr.2013.06.008

来源: Elsevier

【 摘 要 】

This report describes investigations of grain boundary groove effects on mode II dominated interface fracture. The study focused on a specific interface between stainless steel and an epoxy adhesive. First, a finite element model was developed to simulate residual stresses and crack propagation. Second, the simulation results were compared with the experimental results from a previous study (Kanerva et al., 2013. Eng. Fract. Mech. 99, 147-158). Additional measurements were performed using atomic force microscopy. Based on the simulation, a 100-fold toughening effect due to the grain boundaries was determined. Implementation of flaws, in the form of interfacial voids, decreased the toughening effect by 35% and increased the mode II dominance significantly. The work underlines the practical importance of complete wetting by the adhesive and its necessary adherence to the grain boundary groove walls. (C) 2013 Elsevier Ltd. All rights reserved.

【 授权许可】

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