970 research outputs found
Computational methods to predict the non-linear dynamic response of blast loaded laminated composite plates
No full textThe dynamic behaviors of laminated flat and tapered composite plates subjected to blast loads are investigated. Numerical solution techniques and their computational applications which are proposed before in the literature are summarized to show the accuracy and prediction of the response of blast loaded laminated composite plates with and without damping effects. It was shown the effect of damping is not significantly effective for the first peak response. However, it is considerable with the second peak and it becomes greater as time increases. The effect of chosen displacement functions for the approximate-numerical methods is indicated. Deflection and strain–time histories of plates obtained from experiment, finite element, and approximate-numerical methods are compared and found a good agreement
Electrochemical-control of abrasive polishing and machining rates, U.S. Patent 6,171,467
No full textAn apparatus and method is disclosed; both of which use electrochemistry to selectively grow and remove hard oxide coatings on metals, and capacitive double layers on non-metals and semiconductors in order to predict and control the rate of surface abrasion during planarization of the surface of such materials
Improving the damage tolerance of composite T-joints using shape memory alloy tufts
No full textThis paper presents a novel approach to improve the structural properties and damage tolerance of fibre-reinforced polymer composite joints via tufting using shape memory alloy (SMA) filaments. T-shaped joints made of carbon-epoxy composite material were reinforced with thin SMA (Ni-Ti nitinol) tufts. Experimental testing and finite element (FE) modelling reveal that the ultimate load, ultimate displacement and absorbed energy capacity of the T-joint increase with the areal density of SMA tufts. Improvements of over 110% in strength and 450% in absorbed energy capacity were achieved by SMA tufting. Under certain conditions, the shape memory effect of the tufts can be activated via electrical resistance heating to partially or completely close cracks in the T-joint caused by over-loading. The novel use of SMA tufts both to improve the resistance against cracking and to close cracks when they occur is a unique approach to improving the damage tolerance of composite structural joints
Book design: Adrian Bradshaw – The Door Opened: 1980s China
No full textAdrian Bradshaw: Book author
Phil Cleaver: Book design, branding, exhibition design and poster design
Art editor on content and sequencing of photography.
Designed in two languages Chinese and English in a way which combines them both together. Design reflects Chinese culture in a modern way with a western whist.
Embossed slip case with metal badge on cover of book
3D characterisation of carbon fibre reinforced composite microstructure via x-ray computed tomography
No full textCarbon fibre reinforced polymer (CFRP) composite materials possess highly desirable physical and chemical properties and are now commonly utilized in many structural components in aerospace, civil engineering, military, as well as in motorsports and other competition sports. Structural defects in CFRPs are often caused by insufficient fibre impregnation and non-optimized process parameters during the manufacturing process. These defects can severely compromise the expected performance from CFRPs [1], [2]. Understanding the characteristic geometry and shape of these defects as well as their spatial distribution within the three-dimensional (3D) CFRP's structure (matrix and fibres) can provide insight into the origin of their formation and can enable optimization of the fabrication process. In this study, a state-of-art 3D X-ray microscopy technique by computed-tomography (micro-CT), combined with tomographic volume analysis and visualization tools, has been utilized to study a suite of highly different CFRPs. Using both proprietary and open-source software, the main constituent materials (fibres, matrix/resin, voids) of the samples have been identified and segmented; the distribution of each material is then mapped in 3D and the respective volume fractions are quantified. As a case study, segmented voids have been clustered into two different families based on their shape and preferential location within the material micro-structure of one particular sample
Development of a Mode III Test Rig for Composite Laminates and Sandwich Face/Core Fracture Characterization
No full textThe aim of this work consists in developing a novel test rig, which is inspired by the Shear Torsion Bending (STB) rig designed for unidirectional composites. The test rig is capable to carry out fracture characterization tests on pre-delaminated composite sandwich specimens subjected to external out-of-plane shear loadings. Boundary conditions and specimen geometry have been designed in order to induce an out-of-plane stress state as uniform as possible along the debond front. Theoretical and numerical analyses of the specimen enable the understanding of how specimen geometrical parameters and loads introduction influence stress and energy release rate G distributions along the debond front
Bernard Williams
No full textAn edited multi-author volume assessing the moral philosophy of the late British philosopher Bernard Williams. Contributors: Adrian Moore, John Skorupski, Alan Thomas, Robert B Louden, Michael Stocker, A. A. Long, Edward Crai
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