| Summary: | 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.
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