Browsing by Author "Paddea, Sanjooram"

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    A conceptual assessment framework for sustainability in the foundation industries
    (Elsevier, 2024) Litos, Lampros; Paddea, Sanjooram; Salonitis, Konstantinos; Jolly, Mark R.
    Foundation industries in the UK are in constant pursuit of better technological solutions to enhance materials conversion efficiency and supply chain economies of scale. However, sustainable materials and strategies to conserve resources and better utilize waste streams tend to be ever more challenging to achieve when technological advances fall short in being widely adoptable by companies. Knowledge and technology transfer across multiple companies within the same sector (for example, construction materials production) or across seemingly common core processes (such as size reduction or furnaces) must be achieved for sustainability efforts to achieve economies of scale. Part of the reason why this is a difficult endeavor is the lack of visibility of the steps and drivers involved in a circular economy context with a view to achieve scale. Materials and technologies that could help foundation industries become more sustainable are being examined through the introduction of a novel framework that could help companies and policy makers understand where the opportunities exist. In this paper, the authors describe the design and development of the framework and offer examples drawn from an ongoing research and innovation project in foundation industries.
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    Crack path selection at the interface of wrought and wire + arc additive manufactured Ti–6Al–4V
    (Elsevier, 2016-05-12) Zhang, Jikui; Zhang, Xiang; Wang, Xueyuan; Ding, Jialuo; Traoré, Yéli; Paddea, Sanjooram; Williams, Stewart W.
    Crack propagation deviation tendency in specimens containing an interface between wrought alloy substrate and Wire + Arc Additive Manufacture (WAAM) built Ti–6Al–4V is investigated from the viewpoints of microstructure, residual stress and bi-material system. It is found that a crack initiated at the interface tends to grow into the substrate that has equiaxed microstructure and lower resistance to fatigue crack propagation. Experimental observations are interpreted by finite element modelling of the effects of residual stress and mechanical property mismatch between the WAAM and wrought alloy. Residual stresses retained in the compact tension specimens are evaluated based on measured residual stress in the initial WAAM built wall. Cracks perpendicular to the interface kept a straight path owing to the symmetrical residual stress distribution. In this case the tangential stress in bi-material model is also symmetric and has the maximum value at the initial crack plane. In contrast, cracks parallel to the interface are inclined to grow towards the substrate due to the mode II (or sliding mode) stress intensity factor caused by the asymmetric residual stress field. Asymmetric tangential stress in the bi-material model also contributes to the observed crack deviation trend according to the maximum tangential stress criterion.
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    Quantifying the carbon footprint of events: a life cycle assessment-based framework for evaluating impact of location and timing
    (Springer Nature, 2025-01-07) Atescan-Yuksek, Yagmur; Paddea, Sanjooram; Jackson, Sharon; Jolly, Mark R.; Salonitis, Konstantinos
    This research proposes a Life Cycle Assessment-based framework to quantify the carbon footprint of events, considering the event's location and timing. The framework aims to standardise environmental impact calculations through inventory analysis. To validate it, a comparative analysis on conducting an event in different locations and time periods, while maintaining similar scale and nature is conducted. The assessment includes emissions from attendee transport, accommodation, food and drink, and venue. Additionally, it considers emission reductions resulting from attendees not using their personal household resources. This accounts for the actual additional emissions released into the atmosphere as a consequence of the event. The results highlight variations in emissions across different consumption categories based on the selected location and timing. By providing this information, the LCA-based framework provides valuable guidance for event organizers and policymakers to assess event environmental impacts and promote sustainability.