Author
Christopher J. Cleaver
Other affiliations: Massachusetts Institute of Technology
Bio: Christopher J. Cleaver is an academic researcher from University of Cambridge. The author has contributed to research in topics: Metal spinning & Sheet metal. The author has an hindex of 7, co-authored 24 publications receiving 129 citations. Previous affiliations of Christopher J. Cleaver include Massachusetts Institute of Technology.
Topics: Metal spinning, Sheet metal, Curvature, Materials science, Mandrel
Papers
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TL;DR: In this article, a new process is proposed to roll rings with variable wall thickness, enabled by photogrammetry to capture the ring's shape and position, and the trials revealed two new process limits for which new analytical explanations have been developed: a maximum rate of change of thickness around the circumference and a loss of circularity.
18 citations
TL;DR: A 12-axis ring rolling machine has been built to demonstrate these process enhancements, producing metal rings up to 1.m in diameter as discussed by the authors, showing significant improvements in ring cross-sectional form and circularity.
18 citations
TL;DR: In this paper, the authors explore the previously tacit knowledge that plastic changes in curvature - required to maintain circularity - principally occur as material passes through the roll gap, and propose an analytical model of free curvature change based on force equilibrium and compatibility.
17 citations
19 May 2008
TL;DR: In this article, the authors connect life styles and spending patterns to environmental impacts and economic implications for people living in the United States, and show that even the most modest life styles (Buddhist monk, homeless etc) have impacts much larger that the world average.
Abstract: In this study we connect life styles and spending patterns to environmental impacts and economic implications for people living in the United States. The results show that even the most modest life styles (Buddhist monk, homeless etc) have impacts much larger that the world average.
13 citations
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TL;DR: A framework of analysis is presented for understanding closed-loop control in metal forming, allowing an assessment of current and future developments in actuators, sensors and models, and a discussion of likely developments.
Abstract: Metal forming processes operate in conditions of uncertainty due to parameter variation and imperfect understanding. This uncertainty leads to a degradation of product properties from customer specifications, which can be reduced by the use of closed-loop control. A framework of analysis is presented for understanding closed-loop control in metal forming, allowing an assessment of current and future developments in actuators, sensors and models. This leads to a survey of current and emerging applications across a broad spectrum of metal forming processes, and a discussion of likely developments.
133 citations
TL;DR: Flexibility in forming is reviewed from the viewpoints of process, material, manufacturing environment, new process combinations and machine–system–software interactions.
90 citations
TL;DR: In this article, the authors evaluate a survey of 14,500 households and use a method that allows measuring changes in price level of consumption, finding that households with high and low GHG emissions are characterized by less spending on mobility, but more on leisure and quality oriented consumption.
88 citations
TL;DR: In this paper, a set of lifestyle change measures for residential energy use, mobility and waste management in the integrated assessment model is implemented, and the implications of these lifestyle changes in a business-as-usual and 2°C climate mitigation reference case is analyzed.
75 citations
TL;DR: In this article, the authors compare economy-wide modelling of 1.5°C and 2°C scenarios with sector-focused analyses of four critical sectors that are difficult to decarbonise: aviation, shipping, road freight transport, and industry.
62 citations