Karbon/epoksi ve E-cam/epoksi ile Onarılmış Çentikli Alüminyum 5754-H111 Charpy Darbe Tepkisi

Abstract

In this study, aluminum sheets with three different notch depths were repaired with carbon/epoxy and e-glass/epoxy composites and than were investigated experimentally for their response to Charpy impact. [90/45/-45] oriented triaxial fabrics were used in patch reinforcement materials. Composite laminates were prepared in [90/45/-45/45/-45/90] orientation by placing these three axial fabrics on top each other. Hand lay-up technique was used in the preparation of laminated composites. The reinforcement fabrics wetted by hand lay-up were cured by hot molding at 100 °C and 7 bar pressure. Composite plates were produced in 40x40 cm dimensions. Aluminum plates were also provided in 40x40 cm dimensions. Both aluminum and composites were cut with water jet to obtain samples and patches from these plates. The aluminum and composite elements cut to the desired dimensions, were glued to each other on oneside with a double component methyl methacrylate adhesive. In the experimental stage, some mechanical properties of the composites were determined first. Afterwards, the energy absorption capacities of the aluminum plates as repaired and unrepaired in three different notch lengths (3 mm, 5 mm, 7 mm), was determined by conducting Charpy notch impact tests. In addition, Scanning Electron Microscope (SEM) analysis of the composite patches were performed. This study, which was conducted to determine to what extend the composite patches affect the notch impact toughness of the aluminum plate, aims to be a guiding resource for engineers and researchers for composite patch repairs.

Investigation of Mechanical Properties of Sandwich Composites with Notched Grooves on Lateral Surfaces Under Axial Loads

“…Çentik açma işleminde gerilim yoğunluğunun daha az oluşması için küresel kesici kullanılmıştır. Çentik geometrisinin hasar yükleri üzerinde önemli olduğu daha önceki çalışmalarda gösterilmiştir (Dindar ve Ağır, 2021)…”