Abstract
In this study, the hole quality was investigated in the drilling of CARALL composite. In addition, the delamination factor calculation approaches of Chen, Davim, and Machado were compared in terms of the delamination damage at the hole entrance surface. Chen's approach is based on the conventional delamination factor (F d) and Davim's on the adjusted delamination factor (F da). Finally, Machado's approach is based on the minimum delamination factor (F min). The values closest to the nominal hole diameter value were obtained with the uncoated (T1), followed by the TiN-TiAlN-coated (T2) and TiAl/TiAlSiMoCr-coated (T3) carbide drills, respectively. The average circularity error values for the hole top and bottom surfaces were 6.184 µm, 7.647 µm, and 8.959 µm for T1, T2, and T3 tools, respectively. Delamination factor values varied between 1.174 and 1.804. The F da values were found to be the highest, followed by F d values, with F dmin values determined as the lowest.
Highlights
While research on traditional carbon and glass fiber reinforced polymer (CFRP and GFRP) composites [1,2,3,4,5] and sandwich composite materials [6,7,8,9,10] is still ongoing, fiber metal laminates (FMLs) have been introduced as a new composite family in recent years in order to meet the different mechanical property demands of engineers
We focused on the hole quality and hole entrance delamination damage
A comparison of the different approaches for calculating the delamination factor is shown in Figure 7, and damage images are given in Figures 8 and 10
Summary
While research on traditional carbon and glass fiber reinforced polymer (CFRP and GFRP) composites [1,2,3,4,5] and sandwich composite materials [6,7,8,9,10] is still ongoing, fiber metal laminates (FMLs) have been introduced as a new composite family in recent years in order to meet the different mechanical property demands of engineers. During the assembly of the composite/metal components, tens of thousands of holes must be drilled to meet the demand for mechanical bolting or riveting. Their assembly accuracy is critical to the flight performance of aircraft and is highly dependent on the quality of the machined holes [12].
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