Page 392 - Practical Design Ships and Floating Structures

Practical Design of Ships and Other Floating Structures 367
You-Sheng Wu, Wei-Cheng Cui and Guo-Jun Zhou (Eds)
8 2001 Elsevier Science I.td. All rights reserved

NEW PRODUCTION SYSTEM
FOR VESSELS OF COMPOSITE MATERIALS
USING AN ADJUSTABLE MOULD

Jong Oh Kwon', Jaesung Kim', Jung Chun Suh', Hyochul Kim'
Seung Hee Lee', Youn Gill Lee', Kisung Kim', Jae Wook Lee'
9
Jae Moon Led, Sanghong Lee , Jae Kyu Lee4, Dae Sun Kang5, Duk Soo Chung'
Department of Naval Architecture and Ocean Engineering, RIMSE
Seoul National University , Seoul 15 1-742, Korea
2Department of Naval Architecture and Ocean Engineering, Inha University
3Department of Naval Architecture and Ocean Engineering, Chungnam National University
4Design and Research Center, Advanced Marine Tech.
'Korean Society of Ship Inspection and Technology

ABSTRACT
Hull form of a typical planing boat can be easily modified into a set of developable surfaces with
minor modification. Then, the surfaces are developed onto a plane to manufacture thin laminated FRF'
plates on a flat bed. The plates are bended in an adjustable mould system defined by line elements to
form the hull form. In the procedure, ruling lines are used as line elements representing the hull.
Battens made of circular pipes are attached along the line elements and t-heir exact shapes and
locations are maintained by wires and pin jigs. The plates are link together to complete the hull shape
and additional laminas are stacked inside until necessary thickness is obtained. In order to verify the
proposed method and to identify the possible flaws, a 1/3 scale model is constructed on the adjustable
mould. The hull surface is divided into several pieces and developed onto aplane surface. At the fore
body portion front of the 6' station, the hull shape varies rapidly in most case-s and a full scale mock-
up of the fore body part has been constructed using 3mm plywood to evaluate t-he construction
techniques morecarefully. It is found that the new production procedure can be successfully applied
for the construction of planning vessels made of fiber reinforces plastics.

KEYWORDS

Adjustable mould, Developable surface, Fiber reinforced plastic, Planing boat

1 INTRODUCTION

Fiber-reinforced plastic (FRP) is a composite material with excellent physical and mechanical
properties and relatively impervious to the degrading effects of a marine environment. There aremany