Abstract
The presented study is related to the application of the composite overlays used in order to decrease the effect of the stress concentrations around the cut-outs in structural metal elements. The proposed approach with the application of the digital image correlation extends the recently presented studies. Such structural elements with openings of various shapes have been accommodated for a wide range of industrial applications. These structures exhibit certain stress concentrations which decrease their durability and strength. To restore their strength, various reinforcing overlays can be used. In the present paper, the flat panel structure without and with the composite overlays made of HEXCEL TVR 380 M12/26%/R-glass/epoxy is under the experimental and the numerical study. Particular attention is paid to the investigation of the samples with the rectangular holes, which for smooth rounded corners offer a higher durability than the samples with the circular hole of the same size. The experimental results are obtained for the bare element and are reinforced with composite overlay samples. The experimental results are obtained with the use of the Digital Image Correlation method, while the numerical results are the product of the Finite Element Analysis. In the numerical analysis, the study of the shape, size and fiber orientation in applied overlays is done. The reduction of the stress concentration observed in opening notches has confirmed the effectiveness of the overlay application. In the investigated example, the application of the square composite overlay increased the structure strength even by 25%.
Highlights
The structural elements with voids or openings of different shapes are commonly used in design practice
Such intentionally made holes are usually the source of the stress concentration, which may substantially decrease the structure durability or the fatigue endurance in cases of repetitive loading imposition. Another possible danger is the appearance of zones with plastic deformations, which are usually not allowed in standard structure operations. Such zones around the different holes have been recently analyzed using the Digital Image Correlation (DIC) [1], which is under rapid development and is successfully used for damage monitoring of different materials, such as isotropic metals [1], cementitious composites [2], and composites [3]
Special attention is focused on the reduction of such stress concentrations in notches reached through the application of the composite overlays around the cut-out hole
Summary
The structural elements with voids or openings of different shapes are commonly used in design practice. The main reason for this is that it is necessity to provide access to certain parts of the structure or the possibility to supply power or other media to perform the production process or correct operation Such intentionally made holes are usually the source of the stress concentration, which may substantially decrease the structure durability or the fatigue endurance in cases of repetitive loading imposition. Another possible danger is the appearance of zones with plastic deformations, which are usually not allowed in standard structure operations. Special attention is focused on the reduction of such stress concentrations in notches reached through the application of the composite overlays around the cut-out hole
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