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Papers by Jonathan Parker
International Materials Reviews, 2018
International Materials Reviews, 2018
International Materials Reviews, 2018
Science and Technology of Welding and Joining, 2013
ABSTRACT
European Journal of Mechanics - A/Solids, 2021
Materials at High Temperatures
ABSTRACT
Key Engineering Materials
Science and Technology of Welding and Joining
ABSTRACT
Materials Science and Engineering
Key Engineering Materials
Key Engineering Materials
Key Engineering Materials
Materials at High Temperatures
ABSTRACT
Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy
The safe operation of a wide range of large-scale plant depends on knowledge of component specifi... more The safe operation of a wide range of large-scale plant depends on knowledge of component specific materials properties. Techniques that allow reliable measurement of changes in critical properties are therefore vital. The present paper describes a new procedure for removing miniature material samples. The technique can be applied even in difficult access conditions and results in minimum material removal so that sampling is effectively non-destructive. Specific case studies where this technique has been applied to the condition assessment of steam plant are described.
Materials Science and Technology
ABSTRACT
Materials at High Temperatures
The complex thermal cycles associated with fabrication of weldments in 1.25Cr0.5Mo steel have bee... more The complex thermal cycles associated with fabrication of weldments in 1.25Cr0.5Mo steel have been documented. For the weaved welding allowed by the specified procedure, base material locations adjacent to the weld profile have been subjected to up to seven excursions above 800°C during fabrication. The multiplicity of these thermal cycles resulted in a large degree of refinement within the weld metal and heat-affected zone. Creep testing has shown that the weldments produced are highly susceptible to type IV cracking, with damage in the form of cavities and microcracks developing below the specimen surface. This observation, combined with the fact that physical evidence of distress occurs relatively late in life, indicates that traditional methods of structural integrity assessment may be inadequate.
International Journal of Fracture
Materials Science and Engineering
International Materials Reviews, 2018
International Materials Reviews, 2018
International Materials Reviews, 2018
Science and Technology of Welding and Joining, 2013
ABSTRACT
European Journal of Mechanics - A/Solids, 2021
Materials at High Temperatures
ABSTRACT
Key Engineering Materials
Science and Technology of Welding and Joining
ABSTRACT
Materials Science and Engineering
Key Engineering Materials
Key Engineering Materials
Key Engineering Materials
Materials at High Temperatures
ABSTRACT
Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy
The safe operation of a wide range of large-scale plant depends on knowledge of component specifi... more The safe operation of a wide range of large-scale plant depends on knowledge of component specific materials properties. Techniques that allow reliable measurement of changes in critical properties are therefore vital. The present paper describes a new procedure for removing miniature material samples. The technique can be applied even in difficult access conditions and results in minimum material removal so that sampling is effectively non-destructive. Specific case studies where this technique has been applied to the condition assessment of steam plant are described.
Materials Science and Technology
ABSTRACT
Materials at High Temperatures
The complex thermal cycles associated with fabrication of weldments in 1.25Cr0.5Mo steel have bee... more The complex thermal cycles associated with fabrication of weldments in 1.25Cr0.5Mo steel have been documented. For the weaved welding allowed by the specified procedure, base material locations adjacent to the weld profile have been subjected to up to seven excursions above 800°C during fabrication. The multiplicity of these thermal cycles resulted in a large degree of refinement within the weld metal and heat-affected zone. Creep testing has shown that the weldments produced are highly susceptible to type IV cracking, with damage in the form of cavities and microcracks developing below the specimen surface. This observation, combined with the fact that physical evidence of distress occurs relatively late in life, indicates that traditional methods of structural integrity assessment may be inadequate.
International Journal of Fracture
Materials Science and Engineering