L. Finkelstein
The paper discusses the central role of design in technology. It considers the social and economic drivers of innovation and design as well as trends in technology. It views the role of ethics. The life-cycle of products is discussed in relation to design. The definition of requirements, as the starting point of design, is considered. An outline is presented of the design process, and developments in the process considered. A view is given of the way forward and the of the tasks of measurement and instrumentation science in support of design.
XVI IMEKO World Congress
· 2000
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Petr Zlámal, Ondřej Jiroušek, Daniel Kytýř, Jiří Němeček
Knowledge of trabecular bone behaviour under loading is very important for bone quality assessment. For numerical modelling of deformation behaviour of trabecular tissue it is necessary to establish a material model for single trabeculae. For visco-elasto-plastic material model used in this study have to determine eight material constants. Two elastic constants were obtained directly from nanoindentation test by Oliver-Pharr method. Remaining material constants were identified from a Finite Element (FE) simulation of nanoindentation test.
TC15 Youth Symposium 2011
· TC15
· 2011
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Benjamin Zillmann, Thorsten Halle, Martin F.-X. Wagner, Thomas Lampke
The plastic deformation behavior of textured sheet metals under biaxial compression loading is mostly unknown, since the technical implementation of biaxial compression in experimental setups is challenging. Experimental data under biaxial compression loading of textured sheet metals may well be essential to describe their tension / compression asymmetry. There are yield criteria to account for this asymmetry, and for the Bauschinger effect – but accurate modeling relies on accurate experimental data. Various testing methods have been devised to complement conventional tensile testing. Yet...
TC15 Youth Symposium 2011
· TC15
· 2011
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Małgorzata Żak, Celina Pezowicz
Annulus fibrosus as important element of structure of intervertebral disc play fundamental role in mechanical function of spine. Lamellar annulus fibrosus wall mainly consist of collagen fibers, water and proteoglycans. Arrangement of the fibrous matrix in intervertebral disc decide to nonlinear and strongly anisotropic tensile behaviour of the anulus fibrosus. The presented study, provide information about influence number of lamellar, structural organization and connection vertebral bone with annulus fibrosus at mechanical properties.
TC15 Youth Symposium 2011
· TC15
· 2011
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Lothar Kroll, Sebastian Wolf, Sascha Müller, Holg Elsner
The structural integration of new embedded embroidered sensors (EES) in fibre reinforced plastics (FRP) has some advantages by comparison to other measurement solutions like normal strain gauges or fibre bragg gratings (FBG). The ability to produce them in mass production and the less expansive data acquisition systems lead to lower costs by contrast with FBG. In comparison to strain gauges there is no weakening of the FRP after integrating the sensor. For the use of new embedded embroidered sensors knowledge about their characteristics is very important. Therefore some theoretical...
TC15 Youth Symposium 2011
· TC15
· 2011
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Stephen Willshaw, Tom Mullin, György Károlyi
Recent experimental and numerical studies have uncovered a fascinating pattern switching mechanism in 2D cellular structures under uniaxial compression. A square lattice of initially circular voids transforms into an array of mutually orthogonal ellipses as a result of a buckling instability triggered at a critical stress value. This reversible, repeatable phenomenon occurs globally throughout the sample and has been observed at the sub-micron level. This has led to the manufacture of tunable optical devices which utilise this geometric switching to alter photonic band gaps in periodic...
TC15 Youth Symposium 2011
· TC15
· 2011
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Marco Walther, Lothar Kroll, Martin Stockmann, Holg Elsner, Michael Heinrich, Stefan Wagner
The integration of electronic units, sensors and actuators into complex function-oriented systems is one key point in development of intelligent lightweight composites and lightweight structures. A wide range of materials are available for that purpose and can be used to create active structures with selective properties. Often, these complex systems are manually integrated into smart structures with prefabricated and individually designed layer materials. But, automated production is difficult. Therefore, main aim of Department of Lightweight Structures and Polymer Technology (SLK) in...
TC15 Youth Symposium 2011
· TC15
· 2011
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Klaus Vogel, Martin Stockmann, Steffen Zietschmann, Heiko Witteck
Strain gauges are applied in a wide industrial range. Sometimes, their application can be very difficult or even impossible due to a lack of space or the requirement of an electronic connection with a processing unit. To avoid these problems, the SAW Components Dresden GmbH has developed a new sensor system for strain measurements. It is capable to transmit the measured signal directly from the sensor to the processing unit without any need of wires. In comparison to the strain gauge technology, the deformation on the components surface is not determined by a change of the sensors electrical...
TC15 Youth Symposium 2011
· TC15
· 2011
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Caterina Casavola, Carmine Pappalettere, Francesca Tursi
The hole-drilling method is an effective and popular semi-destructive technique for residual stress (RS) measurement. It consists in drilling a very small hole into the specimen; consequently, RS relaxes in the hole and stresses in the surrounding region change causing strains also to change; a strain gage rosette, specifically designed and standardized measures these strains. Using special stress-strain relationships, the RS field is calculated from the measured strains. Stress calculations are extremely sensitive to errors in the measured strain: small strain measurement errors can cause...
TC15 Youth Symposium 2011
· TC15
· 2011
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Ioana Alexandra Takacs, Adrian-Ioan Botean, Mihail Hărdău
The femoral bone is positioned between the hip joint and the knee joint, the upper extrimity taking on the bodies weight that is transmitted by the vertebral column to the pelvis. The femoral bone fractures occur in the femoral neck region. The paper wants to show the state of stresses and the displacements that take place during the compression load in the femoral neck area – plane modelling. Were approached three cases: 1) the femoral neck is not sectioned; 2) in the fractured area two screws are introduced, both having equal diameters; 3) the reconstruction is achieved with 3 screws of...
TC15 Youth Symposium 2011
· TC15
· 2011
· Download