6 research outputs found
Influence of heat treatment on the coefficient of thermal expansion of Al (6061) based hybrid composites
No full textThis paper describes study of coefficient of thermal expansion (CTE) of as-cast and heat-treated aluminium 6061 based hybrid composites, reinforced with SiC particulate and E-glass fiber. These hybrid composites were subjected to different aging durations. The liquid melt technique route was used to produce the castings. Castings were machined in accordance with ASTM standard followed by the heat-treatment process. All the specimens were aged to different periods 1 h, 3 h, 5 h, and 7 h at an aging temperature of 175 °C. CTE tests were performed on the different composites in the both as-cast and heat-treated conditions. In each case the CTE of the composites were found to increase with increase in aging durations. Solution heat treatment at 530 °C followed by artificial aging at 175 °C was found to increase in dimension change of every specimen tested. The CTE curves exhibited some residual strain, which were decreased with the increase in the aging durations. An attempt is made in the paper to explain these phenomenon. © 2006 Elsevier B.V. All rights reserved
Effects of reinforcements content and ageing durations on wear characteristics of Al (6061) based hybrid composites
No full textThis technical paper describes the abrasive wear rate of as-cast and heat-treated Al (6061) alloy reinforced with 9 by weight of SiC particulate and 0, 1, 3 and 5 by weight of E-glass fibre subjected to different ageing durations. The liquid melt technique route is used to produce the castings. Castings were machined to the ASTM standards and T6 heat-treatment process is carried out. All the specimens were artificially aged to different durations like 1, 3, 5 and 7 h at a temperature of 175 °C. Wear tests were performed on various composites in both the heat-treated and as-cast conditions using pin-on-disc machine. In each test the wear rates of the hybrid composites were found to decrease with increase in ageing durations. However, in both as-cast and heat-treated hybrid composites, the wear rate increased with increase in the sliding distance. © 2006 Elsevier B.V. All rights reserved
AO Spine RECODE-DCM Research Priority Number 10
No full textStudy Design: Literature Review (Narrative). Objective: To introduce the number 10 research priority for Degenerative Cervical Myelopathy: Individualizing Surgery. Methods: This article summarizes the current recommendations and indications for surgery, including how known prognostic factors such as injury time, age, disease severity, and associated comorbidities impact surgical outcome. It also considers key areas of uncertainty that should be the focus of future research. Results: While a small proportion of conservatively managed patients may remain stable, the majority will deteriorate over time. To date, surgical decompression is the mainstay of treatment, able to halt disease progression and improve neurologic function and quality of life for most patients. Whilst this recognition has led to recommendations on when to offer surgery, there remain many uncertainties including the type of surgery, or timing in milder and/or asymptomatic cases. Their clarification has the potential to transform outcomes, by ensuring surgery offers each individual its maximum benefit. Conclusion: Developing the evidence to better guide surgical decision-making at the individual patient level is a research priority for Degenerative Cervical Myelopathy.AO Spine through the AO Spine Knowledge Forum Spinal Cord Injury; AO Spine Research Department; National Institute for Health Research (NIHR) Brain Injury MedTech Co-operative based at Cambridge University Hospitals NHS Foundation Trust; University of Cambridge; NIHR Clinical Doctoral Research FellowshipThe author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: The research priorities were organized and funded by AO Spine through the AO Spine Knowledge Forum Spinal Cord Injury, a focused group of international Spinal Cord Injury experts. AO Spine is a clinical division of the AO Foundation, which is an independent medicallyguided not-for-profit organization. Study support was provided directly through the AO Spine Research Department. MRNK is supported by the National Institute for Health Research (NIHR) Brain Injury MedTech Co-operative based at Cambridge University Hospitals NHS Foundation Trust and University of Cambridge, andBMD a NIHR Clinical Doctoral Research Fellowship. The views expressed in this publication are those of the authors and not necessarily those of the NHS, the National Institute for Health Research or the Department of Health and Social Care
Thermal residual stress investigation in Al 2024/ Cu-Al-Ni adaptive composites by X-Ray diffractometer
No full textThe effect of thermal ageing on the wear behaviour of Al 6061 based hybrid composites
No full textThis paper examines the abrasive wear rate of as-cast and heat-treated 6061 Al alloy reinforced with 5 by weight of SiCparticulate and 1,3 and 5 by weight of E-glass fibre subjected to different ageing durations. The liquid melt technique route was used to produce the castings, which were then machined to ASTM standards and subsequently heat-treated. All the specimens were artificially aged for different duration (namely, 1 h, 3h, 5 h and 7h)at 175°C. Wear tests were performed on the composites in the both heat-treated and as-cast conditions usingpin-on discmachine. The aged composites revealed the presence of the solute clusters (GP zones) and small coherent precipitates in the aluminium alloy matrices and mobile dislocations easily shear these. The wear rates of the hybrid composites were found to decrease with increase in ageing durations. However, in both as-cast and heat-treated hybrid composites, the wea rate increased with increase in the sliding distance. Solution heat treatment at 530°C followed by artificia ageing at 175°C was found to improve the wear resistance of every specimen tested. It is concluded that heat-treated hybrid composites are very effective in improving the wear resistance
