Investigation of the Application of adhesively bonded lifting lugs in ship building

Investigation of the Application of adhesively bonded lifting lugs in ship building

Sun, J.

Pruijn, J.F.J. (mentor)

Mechanical, Maritime and Materials Engineering

Marine and Transport Technology

2017-01-31

Defects are produced when lifting lugs being welded on ship sections during the building process. The large amount of heat produced in the welding work causes “heat affected zone” in the base metal on sections and destroys painted coatings on the plates; and residual stress decreases the mechanical performance of the steel plates. To eliminate the defects, it is hypothesized that “structural adhesive bonding” can replace welding for installing lifting lugs to some extent. An investigation of the application of adhesively bonded lifting lugs in ship building is processed to give methods for the application and check the feasibility of replacing welded lifting lugs with adhesively bonded lifting lugs. In the research, a serious of rules for adhesively bonded lifting lugs is adapted from rules for welded lifting lugs; “structural adhesives”, “adhesive bonding joints”, “the shape and geometry of lifting lugs” and “positions for installation” are investigated. Then adhesively bonded lifting lugs are designed based on the adapted rules; and then improved after the evaluation by FEM simulation. The results show that adhesively bonded lifting lugs can replace welding lifting lugs with high probability when the capacity is less than 20ton; when the capacity is between 20ton and 30ton, limitations such as “not enough bonding area” and “no positions for installation” constrain the replacement. When the capacity of a lifting lug is above 30ton, adhesively bonded lifting lugs cannot replace welded lifting lugs.

ship building
lifting lugs
structural adhesive
adhesive bonding

http://resolver.tudelft.nl/uuid:70c3126b-776f-4ec4-9e14-a739b985c929

Student theses

master thesis

(c) 2017 Sun, J.