Characterisation of a Thin Functionally Graded Bi-metallic Wall Fabricated Using Wire-Arc Additive Manufacturing (WAAM): A Study on the Microstructural Evolution and Mechanical Behaviour Due to Grading

A multi-material structure combines diverse materials, allowing for precise tailoring of properties in specific regions. The integration of dissimilar materials leads to superior performance compared to single-material components. Bimetallic structures, a subset of multi-material systems, offer site-specific performance owing to the contrasting...

Thermal analysis of the Wire and Arc Additive Manufacturing process using the F.E. method

In this research, a thermal analysis of the wire and arc additive manufacturing process is presented based on the F.E. method. <br/><br/>An important quality of the F.E. model that is presented in this research is to describe the temperature field that is experienced by the deposited material in the wire and arc additive manufacturing process....

Cleavage Fracture Micromechanisms of High Strength Steel and its Heat-Affected Zones

The use of materials in increasingly severe service conditions raises concerns about structural safety with respect to cleavage fracture. There are three main material-related challenges that structures face under harsh environments: 1) the trade-off between strength and toughness; 2) the ductile-to-brittle transition behaviour of BCC high...

Microstructural characterisation of recycled carbon fibre reinforced polymer composites: Application and evaluation of the method of ellipses

Carbon fibre reinforced polymer (CFRP) composites are well-known for their specific strength and stiffness properties. For the past two decades, various industries have increasingly used these materials to improve performance and reduce emissions. This increased use has caused a problematic growth in both production and end-of-life CFRP waste....

Method for the Microstructural Characterisation of Unidirectional Composite Tapes

The outstanding properties of carbon fibre-reinforced polymer composites are affected by the development of its microstructure during processing. This work presents a novel approach to identify microstructural features both along the tape thickness and through the thickness. Voronoi tessellation-based evaluation of the fibre volume content on...

Modelling recovery kinetics in high-strength martensitic steels

The decrease in dislocation density and hence the high strength loss can be modelled during martensite tempering as a recovery process. In this work, an innovative approach is presented to understand the role of silicon associated with the inhibition of the recovery rate. A phenomenological model is presented, where a combination of cross...