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排序方式: 共有81条查询结果,搜索用时 15 毫秒
1.
Shanmugam Kumar Brian L. Wardle Muhamad F. Arif Jabir Ubaid 《Advanced Engineering Materials》2018,20(1)
Multilayered multi‐material interfaces are encountered in an array of fields. Here, enhanced mechanical performance of such multi‐material interfaces is demonstrated, focusing on strength and stiffness, by employing bondlayers with spatially‐tuned elastic properties realized via 3D printing. Compliance of the bondlayer is varied along the bondlength with increased compliance at the ends to relieve stress concentrations. Experimental testing to failure of a tri‐layered assembly in a single‐lap joint configuration, including optical strain mapping, reveals that the stress and strain redistribution of the compliance‐tailored bondlayer increases strength by 100% and toughness by 60%, compared to a constant modulus bondlayer, while maintaining the stiffness of the joint with the homogeneous stiff bondlayer. Analyses show that the stress concentrations for both peel and shear stress in the bondlayer have a global minimum when the compliant bond at the lap end comprises ≈10% of the bondlength, and further that increased multilayer performance also holds for long (relative to critical shear transfer length) bondlengths. Damage and failure resistance of multi‐material interfaces can be improved substantially via the compliance‐tailoring demonstrated here, with immediate relevance in additive manufacturing joining applications, and shows promise for generalized joining applications including adhesive bonding. 相似文献
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3.
Dehong Huo Kai Cheng Frank Wardle 《International Journal of Machine Tools and Manufacture》2010,50(4):335-343
Ultraprecision machines with small footprints or micro-machines are highly desirable for micro-manufacturing high-precision micro-mechanical components. However, the development of the machines is still at the nascent stage by working on an individual machine basis and hence lacks generic scientific approach and design guidelines. Using computer models to predict the dynamic performance of ultraprecision machine tools can help manufacturers substantially reduce the lead time and cost of developing new machines. Furthermore, the machine dynamic performance depends not only upon the mechanical structure and components but also the control system and electronic drives. This paper proposed a holistic integrated dynamic design and modelling approach, which supports analysis and optimization of the overall machine dynamic performance at the early design stage. Based on the proposed approach the modelling and simulation process on a novel 5-axis bench-top ultraprecision micro-milling machine tool – UltraMill – is presented. The modelling and simulation cover the dynamics of the machine structure, moving components, control system and the machining process, and are used to predict the overall machine performance of two typical configurations. Preliminary machining trials have been carried out and provided the evidence of the approach being helpful to assure the machine performing right at the first setup. 相似文献
4.
Kent E. Wardle Todd R. Allen Mark H. Anderson Ross E. Swaney 《American Institute of Chemical Engineers》2010,56(8):1960-1974
The annular centrifugal contactor is a combination mixer/centrifuge that has been developed for solvent extraction processes for recycling used nuclear reactor fuel. The experimental observations presented were part of a simulation‐focused research effort aimed at providing a more complete understanding of the fluid flow within these contactors to enable further advancements in design and operation of future units and greater confidence for use of such contactors in a variety of other solvent extraction applications. Laser doppler velocimetry (LDV), particle image velocimetry (PIV), pressure measurements, and high‐speed video imaging for a range of flow rates and rotor speeds were performed to characterize the flow of water in the annular mixing region of the contactor using three different mixing vane geometries. It was found that the geometry of the mixing vanes has a significant impact on the annular liquid height and general flow in the contactor mixing zone. © 2009 American Institute of Chemical Engineers AIChE J, 2010 相似文献
5.
Wardle Jane; Williamson Sara; McCaffery Kirsten; Sutton Stephen; Taylor Tamara; Edwards Robert; Atkin Wendy 《Canadian Metallurgical Quarterly》2003,22(1):99
This article describes a trial of a psychoeducational intervention designed to modify negative attitudes toward flexible sigmoidoscopy screening and thereby increase screening attendance. The intervention materials addressed the multiple barriers shown to be associated with participation in earlier studies. Adults ages 55-64 (N=2,966), in a "harder-to-reach" group were randomized either to receive an intervention brochure or to a standard invitation group. Attitudes and expectations were assessed by questionnaire, and attendance at the clinic was recorded. Compared with controls, the intervention group had less negative attitudes, anticipated a more positive experience, and had a 3.6% higher level of attendance. These results indicate that psychoeducational interventions can provide an effective means of modifying attitudes and increasing rates of screening attendance. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
6.
Complex tasks in unstructured/hazardous environments often require teleoperation. The telepresence robot featured here has “user friendly” limb linked output and feedback systems. The mechanism design and sensory feedback of visual, audio and multi-functional tactile (pressure, texture/slip and thermal parameters) are described 相似文献
7.
Simultaneous but independent pairs of observations of solar radiation made in close proximity to each other for extended time periods at both Vancouver and Toronto have permitted an objective determination of the uncertainty in measurements of solar radiation. The widely quoted observation error of ±5 per cent for an individual observation is appropriate to an hourly time interval, with the uncertainty showing substantial reduction with increased time averaging. The absolute values of the systematic differences were of similar magnitude (2–2.5 per cent) at the two locations. Both the individual and systematic differences showed marked seasonal and interannual variability, with all relative errors being greatest in the winter months. However, at both locations the absolute values of these same statistics showed a strong dependence on the observed irradiance. The variability of these discrepancies illustrates the need to specify the basic time interval and irradiance when selecting or quoting a measurement error. 相似文献
8.
The static and dynamic stiffnesses of spindle-bearing systems are examined. It is shown that for most general purpose spindle designs spring or hydraulically preloaded bearing arrangements can produce more rigid spindles than comentational bearing arrangements. It is also argued that adjustable preload enables bearing damping to be matched to the spindle-bearing system to give maximum dynamic stiffness. The RHP Variload bearing arrangement is introduced. 相似文献
9.
Gareth Powells Sandra Bell Ellis P. Judson Stephen M. Lyon Robin Wardle Klara Anna Capova Harriet Bulkeley 《Energy Efficiency》2016,9(3):591-604
Managing the electricity network through ‘smart grid’ systems is a key strategy to address challenges of energy security, low carbon transitions and the replacement of ageing infrastructure networks in the UK. Small and medium enterprises (SMEs) have a significant role in shaping patterns of energy consumption. Understanding how their activities interrelate with changes in electricity systems is critical for active network management. A significant challenge for the transformation of electricity systems involves comprehending the complexity that stems from the variety of commercial activities and diversity of social and organizational practises among SMEs that interact with material infrastructures. We engage with SMEs to consider how smart grid interventions ‘fit’ into everyday operational activities. Drawing on analysis of empirical data on electricity use, smart metre data, surveys, interviews and ‘energy tours’ with SMEs to understand lighting, space heating and cooling, refrigeration and IT use, this paper argues for experimenting with the use of practise theory as a framework for bringing together technical and social aspects of energy use in SMEs. This approach reveals that material circumstances and temporal factors shape current energy demand among SMEs, with ‘connectedness’ an emergent factor. 相似文献
10.
Three-dimensional reinforcement of woven advanced polymer–matrix composites using aligned carbon nanotubes (CNTs) is explored experimentally and theoretically. Radially-aligned CNTs grown in situ on the surface of fibers in a woven cloth provide significant three-dimensional reinforcement, as measured by Mode I interlaminar fracture testing and tension-bearing experiments. Aligned CNTs bridge the ply interfaces giving enhancement in both initiation and steady-state toughness, improving the already tough system by 76% in steady state (more than 1.5 kJ/m2 increase). CNT pull-out on the crack faces is the observed toughening mechanism, and an analytical model is correlated to the experimental fracture data. In the plane of the laminate, aligned CNTs enhance the tension-bearing response with increases of: 19% in bearing stiffness, 9% in critical strength, and 5% in ultimate strength accompanied by a clear change in failure mode from shear-out failure (matrix dominated) without CNTs to tensile fracture (fiber dominated) with CNTs. 相似文献