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Repair scheme for the damaged hull. The damaged sandwich panel consists of two high strength GRP skin and skins separated by a low density, lower strength foam core.

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Introduction

Principles of Materials - Assignment 5 Ersin SUNGUR The repair scheme for the damaged hull can be processed according the following repair flow chart; Damage Assessment The damaged sandwich panel consists of two high strength GRP skin and skins separated by a low density, lower strength foam core. The cross section of hull in the damaged area is shown in Figure 1. Figure 1 - Cross Section of Damaged Hull Such structures can be subjected to three damage scenarios. The damage can be limited to one skin (Type A), to one skin and the core (Type B), or to both skins and the core (Type C). Type A damage generally involves matrix cracking, fiber breakage and delaminations in the skin. The damage may or may not extend through the full thickness of the skin. Type A damage can also include debonding of the skin from the core. ...read more.

Middle

Moisture problems also limit field applications of bonded repairs in thick composites. Bolted repairs are well suited to the repair of battle damage since they are easy to apply by unskilled personnel and require minimum facilities. [2] Both bonded and bolted repair methods could be applied to repair marine sandwich structures. Bonded repairs were considered to be lighter in weight and distribute the load more evenly over a wider area. However, they require careful surface preparation, are difficult to inspect and are more difficult to perform correctly. Bolted repairs are more easily carried out and require minimal surface preparation. However, they add bulk and weight and require holes to be drilled through the structure which can introduce further damage and create stress concentrations. Additionally, bolted repairs are more difficult to implement on sandwich structures and need to be water-tight [3]. Since the yacht has been rammed well above the water line, it could continue its operation with small leakages. ...read more.

Conclusion

Sand the edges of both skins to a taper per layer providing a scarf angle 3. Install the replacement foam. a) Use a paste adhesive designed to bond foam. However, instead of using vacuum, the adhesive was injected into the bondline using a caulking gun. b) Use a backing plate where required. c) Use the appropriate grade of foam. d) Use the minimum amount of adhesive. 4. Replace the skins. a) Use the same number of layers as the original skin. b) Apply one extra layer of GRP. 5. Replace the skins on other side. a) Use the same number of layers as the original skin. b) Apply one extra layer of GRP. Quality Check / NDT For comprehensive inspection of repaired part, Non Destructive Test (NDT) can ve used. The inspector should examine the quality of the repaired area and particular attention should be given to the interface between the original part and the repaired area. Usual inspection methods use some form of ultrasonic test equipment where the reflection of the ultrasonic sound waves detect and identify any damaged areas or faults [4]. ...read more.

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