Study Notes Quiz
With reference to the production of glass reinforced plastic (GRP) hulls:
(a) outline the properties of glass fibre and resin that make them suitable for the construction of a hull;(3)
(b) describe the traditional method for the layup of a GRP hull;(5)
(c) list FOUR disadvantages of GRP hulls in service.(2)
With reference to the production of glass reinforced plastic (GRP) hulls:
(a) describe the process of resin infusion moulding for the production of a hull;(4)
(b) state the advantages of resin infusion moulding with respect to traditional methods of construction;(3)
(c) explain how this process can virtually eliminate the onset of osmosis in the hull.(3)
With reference to osmosis in glass reinforced plastic (GRP) hulls:
(a) explain the process of osmosis and the method by which osmotic blisters occur in service;
(6)
(b) describe a procedure for the local treatment of a single blister.(4)
With reference to osmosis in glass reinforced plastic (GRP) hulls:
(a) explain how osmosis may be detected in service;(2)
(b) explain why simply drying out the hull is not a cure for the effects of osmosis;(2)
(c) describe the FULL process for the treatment of a hull suffering from the effects of osmosis.(6)
With reference to in service defects found in glass reinforced plastic (GRP) hulls:
(a) state THREE possible causes of de-lamination;(3)
(b) describe TWO methods of detecting de-lamination in service;(2)
(c) describe TWO methods of repair to de-lamination on a sandwich construction hull;(2)
(d) list THREE design problems that can lead to stress cracking.(3)
With reference to glass reinforced plastic (GRP) hulls:
(a) state THREE causes for EACH of the following defects to occur:
(i) de-lamination;(3)
(ii) osmotic blisters;(3)
(iii) stress cracking;(3)
(b) state the part of the underwater section of the hull on which osmotic blisters most commonly occur.(1)
With reference to root whitening in GRP hull construction:
(a) explain the term root whitening, stating where it is most likely to occur;(2)
(b) explain TWO possible reasons why this may happen;(4)
(c) state TWO possible actions that could be taken if it is discovered.(4)