Design of optimum patch shape and size for bonded repair on damaged Carbon fibre reinforced polymer panels

Energy absorption of repaired composite laminates subjected to impact loading

“…Kashfuddoja and Ramji [10] designed for optimizing patch size and shape for bonded repair on CFRP laminates. They considered the patch shape in circle, rectangle, square, ellipse, octagon M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 2 and oval.…”

Effect of patch hybridization on the compression behavior of patch repaired glass/epoxy composite laminates using acoustic emission monitoring

“…To induce damage, a circular notch of diameter 20 mm was produced in the geometric center of the glass/epoxy specimens using an abrasive water‐jet cutting machine. This kind of removal comes about in low velocity impact damage . Before starting with the repair process, the damaged area of the glass/epoxy specimens was wiped using acetone solution to avoid the presence of contaminants and debris from cutting operation (as per standard ASTM D2093) after the water‐jet machining process.…”

“…These distinct characteristics make adhesively bonded external patch repair a simple and effective repair method in fiber reinforced laminated composites, as confirmed by the increasing attention that they are progressively gaining within the research community. So far, many investigations have been carried out to optimize the patch thickness, patch orientation, and patch shape of the adhesively bonded external patch repairs under different loading conditions using experimental, analytical, or numerical approaches, and the information regarding their residual mechanical behavior can be observed from many previous pieces of literature . Numerous investigations in the area of patch repair of the laminated composite have been constrained for secondary load bearing components taking into consideration adhesive parameters (i.e., adhesive material, adhesive thickness), patch thickness, patch orientation, and patch shape as the major feature influencing the mechanical behavior of these repaired laminates .…”

“…Furthermore, the previous literature shows that the fiber reinforcement used to fabricate the external patches were identical to that of the fabric used to fabricate the parent laminate . Due to high specific mechanical properties, carbon and glass fibers are the fiber reinforcements of choice in aerospace sectors.…”

Effect of post-cure temperature and different reinforcements in adhesive bonded repair for damaged glass/epoxy composites under multiple quasi-static indentation loading

“…Currently, research on the design analysis of adhesive bonded repairs focuses on the optimization of the external patch, without taking into account of the effect of internal repair material used in filling the dressed damaged region [22][23]. However, under transverse loading conditions such as impact and indentation loading, the efficiency of an adhesive bonded repaired laminate depends not only on the shape, orientation and thickness of the external patches, but also on the toughness of the material used to fill the dressed region; therefore, to ensure better performance, a filler material with higher transverse load carrying capability must be introduced.…”