الصفحات

Alexandria Engineeing Libraries

بحث هذه المدونة الإلكترونية

شرح طريقة تحميل الامتحانات من المدونة

الأحد، 23 مارس، 2014

Applications of Fiberglass in Small Marine Units Building

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.

ليست هناك تعليقات:

إرسال تعليق