On the effect of roughness parameters on adherence using the three-point bending test (ISO 14679:1997)

In the present work, a specific three-point bending test is applied to evaluate how roughness can impact bond strength (adherence) and mechanism of interfacial failure initiation. The study conducted using an aluminum alloy 2024-T3 as substrate DGEBA (polyepoxide bisphenol A diglycidyl ether) /DETA (diethylenetriamine) adhesive, considering different abrasive surface treatments. An optimal reached maximize critical force during initiation; besides, impacted propagation initiation area for each treatment. power-law regression considered correlate area, average roughness. Local assessment mechanical profilometer Scanning Electron Microscope (SEM) with Focused Ion Beam (FIB) are measure residual adhesive thickness at zones well initiation-to-propagation transitions. It constated that dependent on substrate. Finally, Weibull’s analysis undertaken demonstrate all groups essentially same, although be different.