Title :
Applications
of Fiberglass in Small Marine Units Building
Author :
Yousra Anwar
Abd El-Hady
Collection : M.Sc. Marine
Abstract:
The
use of fiberglass in the marine industry has flourished over time for a number
of different reasons. Initially, long-term durability and favorable fabrication
economics were the impetus for using Fiber Reinforced Plastic (FRP). More
recently, improved vessel performance through weight reduction has encouraged
its use. Since the early 1960s, a key factor that makes FRP construction
attractive is the reduction of labor costs when multiple vessels are fabricated
from the same mold. FRP materials also have gained unilateral acceptance in
pleasure crafts because of light weight, vibration damping, corrosion
resistance, impact resistance, low construction costs and ease of fabrication,
maintenance and repair. Fiberglass construction has been the mainstay of the
recreational boating industry since the mid-1960s. After about 20 years of
development work, manufacturers seized the opportunity to mass produce easily
maintained hulls with a minimum number of assembled parts. Much of the early
FRP structural design work relied on trial and error, which may have also led
to the high attrition rate of startup builders. The primary objective of this
study was to illustrate the effect of varying the glass content on the weight
and strength. So this research project focuses on the application of various
composite materials and manufacturing methods in boat building and their impact
on the mechanical properties and strength of the product. This has been
achieved by focusing on the popular composite materials used in boat building
and the most well-known manufacturing processes and illustrating the methods
used in calculating the mechanical properties of the laminate as well as the
different failure criterions. Also the use of the rules and regulations in
determining the minimum scantlings for various members of a boat by applying
the Lloyd’s Register Rules and Regulations for Special Service Crafts, July
2009 for calculating the pressures exerted on the different parts of the boat
hull and then calculating the scantlings. Finally taking a midship section as a
case study which is laminated by using hand-layup then comparing the strength
and weight of its members by varying the glass content ratio and that by using
manual calculation calculated by using the Lloyd’s Register Rules and
Regulations for Special Service Crafts, Calculation Procedures for Composite
Construction Section, July 2009 and finite element analysis by using ANSYS
14.0. At the end the study has found that as the glass content increases the
weight decreases and the strength increases. Due to the conclusion of that the
strength to weight ratio increases by increasing the glass content, it has been
recommended to make further studies by using vacuum bagging and different
composite materials like Carbon fiber and high-tech fibers like bi-axial and
tri- axial with epoxy resin, as carbon fiber is characterized by its high
mechanical properties over glass fiber but it is well-known for its
brittleness.
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