Design of a cargo fastening device with a load indicator for heavy cargo

• Main Author: Stenkvist, Niklas
• Format: Others
• Language: English
• Published: Karlstads universitet, Avdelningen för maskin- och materialteknik 2014
• Subjects: Turnbuckle
• Online Access: http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-33401

The aim of this thesis was to develop a new turnbuckle for fastening containers on cargo ships. The design was supposed to indicate whether the turnbuckle could be re-used, i.e. it hadn't plastically deformed. This indication could reduce the risk of a turnbuckle breaking during transport, since turnbuckles that have been exposed to a load above their safe working load would indicate this. \newline In total 25 different concepts were developed and put through two different elimination matrices which were evaluated against a requirement specification. The final design had calculated stress of 630 MPa at breaking load and 472 MPa proof load, the loads are defined by Germanischer Lloyd. A concept for measurement of the deformation of the turnbuckle was developed, however it is in need of further development and testing before it can be implemented. A suggestion of manufacturing method, material and surface treatment has been given, but prototype testing is required to verify the design and ensure adequate corrosion protection.