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Spletni katalog oblazinjenega pohištva
Danica Rožič, 2010, diplomsko delo

Opis: Namen diplomskega dela je bil izdelati spletni katalog oblazinjenega pohištva. Uvodni del diplomskega dela opisuje materiale, konstrukcijo oblazinjenega pohištva in ploske tekstilije, ki se uporabljajo za njihovo izdelavo. V nadaljevanju je opisana uporabo programov Google SketchUp in 3DVia Shape. Opisana so osnovna orodja in potek risanja 3D modelov oblazinjenega pohištva z navedenima programoma. Cilj diplomskega dela je bila vizualizacija različic desetih modelov oblazinjenega pohištva z uporabo 3D računalniške grafike in prikaz izdelanih modelov v obliki spletnega kataloga, izdelanega na spletnem portalu Wix.
Ključne besede: spletni katalogi, oblazinjeno pohištvo, tekstilije, Google SketchUp, 3DVia Shape, Wix
Objavljeno: 06.01.2011; Ogledov: 2103; Prenosov: 125
.pdf Celotno besedilo (21,75 MB)

Urška Juvan, 2011, diplomsko delo

Opis: Namen diplomskega dela Računalniško podprto 3D risanje in predstavitev oblazinjenega pohištva je bil prostorsko risanje in predstavitev modelov oblazinjenega pohištva, kreiranih po lastnih zamislih. V uvodnem delu diplomske naloge so predstavljene vrste in lastnosti materiala za oblazinjeno pohištvo, konstrukcija sedežnih garnitur in različne teksture, barve in vzorci. V nadaljevanju opisa sledi uporaba programov Google SketchUp 8 Pro in 3DVIA Shape. Prikazan je potek risanja oblazinjenega pohištva (pet različnih modelov / dve kolekciji). Na koncu je prikazano oblikovanje predstavitve izdelanega oblazinjenega pohištva v obliki promocijskega filma, izdelanega s programoma CAM Studio in Windows Movie Maker. Cilj diplomskega dela je bila predstavitev in izdelava desetih modelov oblazinjenega pohištva z uporabo 3D računalniške grafike in izdelava predstavitvenega videa z uporabo ustreznih grafičnih programov.
Ključne besede: Oblazinjeno pohištvo, 3D programi, Google SketchUp, 3DVIA Shape, tkanine, video predstavitev, Windows Movie Maker.
Objavljeno: 12.10.2011; Ogledov: 2765; Prenosov: 148
.pdf Celotno besedilo (3,46 MB)

Optimization of elastic systems using absolute nodal coordinate finite element formulation
Bojan Vohar, Marko Kegl, Zoran Ren, 2006, kratki znanstveni prispevek

Opis: An approach to a shape optimization of elastic dynamic multibody systems is presented. The proposed method combines an appropriate shape parameterization concept and recently introduced finite element type using absolute nodal coordinate formulation (ANCF). In ANCF, slopes and displacements are used as the nodal coordinates instead of infinitesimal or finite rotations. This way one avoids interpolation of rotational coordinates and problems with finite rotations. ANCF elements are able to describe nonlinear deformation accurately; therefore, this method is very useful for simulations of lightweight multibody structures, where large deformations have to be taken into account. The optimization problem is formulated as a nonlinear programming problem and a gradient-based optimization procedure is implemented. The introduced optimization design variables are related to the cross-sectional parameters of the element and to the shape of the whole structure. The shape parameterization is based on the design element techniqueand a rational B ezier body is used as a design element. A body-like design element makes possible to unify the shape optimization of both simple beams and beam-like (skeletal) structures.
Ključne besede: mechanics, dynamics of material systems, multibody systems, elastic mechanical systems, manipulators, dynamically loaded beams, optimum shape design, absolute nodal coordinate formulation, design element technique, finite element method
Objavljeno: 31.05.2012; Ogledov: 1138; Prenosov: 69
URL Povezava na celotno besedilo

Characterization of Cu-Al-Ni melt-spun ribbons using a focussed ion beam (FIB)
Franc Zupanič, Elfride Unterweger, Albert C. Kneissl, Ivan Anžel, Gorazd Lojen, 2007, izvirni znanstveni članek

Opis: This work investigates the possibilities for applying a focussed ion beam (FIB) for the metallographic preparation and characterization of Cu-Al-Ni melt-spun ribbons. Two alloys were selected for this reason: CuAl13Ni4 and CuAl15Ni4. The microstructure of the first alloy was fully martensitic and the microstructure of the second consisted of two phases: martensite and ▫$\gamma_2$▫. It was discovered that with FIB-etching the microstructures of both alloys can be clearly revealed on polished cross-sections of the melt-spun ribbons, as well as on their wheel-side and air-side surfaces. However, better results were obtained when the etched surface was smoother, and finer details were visible when using smaller ion currents. In addition, a study was made into the influence of platinum deposition on the quality of 3D-cross sections. It was found that Pt-deposition is necessary when the edge of the trench should be straight and sharp, and the surface of the 3D cross-section smooth. However, in this case, the microstructure of the ribbons free surface cannot be seen.
Ključne besede: focussed ion beam, FIB, metallography, melt-spinning, shape memory alloy, Cu-Al-Ni
Objavljeno: 31.05.2012; Ogledov: 862; Prenosov: 17
URL Povezava na celotno besedilo

Shape optimization of truss-stiffened shell structures with variable thickness
Marko Kegl, Boštjan Brank, 2006, izvirni znanstveni članek

Opis: This paper presents an effective approach to shape optimal design of statically loaded elastic shell-like structures. The shape parametrization is based on a design element technique. The chosen design element is a rational Bézier body, enhanced with a smoothly varying scalar field. A body-like designelement makes possible to unify the shape optimization of both pure shells and truss-stiffened shell structures. The scalar field of the design element is obtained by attaching to each control point a scalar quantity, which is an add-on to the position and weight of the control point. This scalar field is linked to the shell thickness distribution, which can be optimized simultaneously with the shape of the shell. For linear and non-linear analysis of shell structures, a reliable 4-node shell finite element formulation is utilized. The presented optimization approach assumes the employment of a gradient-based optimization algorithm and the use of the discrete method of direct differentiation to perform the sensitivity analysis.Four numerical examples of shell and truss-stiffened shell optimization are presented in detail to illustrate the performance of the proposed approach.
Ključne besede: mechanics of structures, shape optimization, shells, trusses, Bézier body, numerical methods, optimum design
Objavljeno: 30.05.2012; Ogledov: 1111; Prenosov: 67
URL Povezava na celotno besedilo

Metallographic sample preparation of orthodontic Ni-Ti wire
Lidija Zorko, Rebeka Rudolf, 2009, izvirni znanstveni članek

Opis: Shape memory alloys (SMA) has been at the forefront of research for the last several decades. In this field especially, Nickel-Titanium (Ni-Ti) alloys have been found to be the most useful of all SMA. The most important applications of SMA Ni-Ti alloys are namely in medicine and dentistry, where they are used as orthodontic wires. In this paper we describe the procedure of preparing metallographic samples of typical orthodontic Ni-Ti wires which are nowadays used in dentistry praxis. We prepared the samples for microstructure observation using a light microscope. Special attention is given to the metallographic preparation, which could result in damages and deformations of the sample surfaces if the procedure is incorrect. Finally, we illustrated the typical metallographic recipe for Ni-Ti SMA alloys for optical observation.
Ključne besede: shape memory alloys, Ni-Ti wire, metallographic preparation, microstructure
Objavljeno: 31.05.2012; Ogledov: 1028; Prenosov: 18
URL Povezava na celotno besedilo

Microstructure of rapidly solidified Cu-Al-Ni shape memory alloy ribbons
Gorazd Lojen, Ivan Anžel, Albert C. Kneissl, Elfride Unterweger, Borut Kosec, Milan Bizjak, 2005, izvirni znanstveni članek

Opis: Cu-Al-Ni shape memory alloys (SMAs) are currently the only available high temperature SMAs, showing a good resistance against functional fatigue. In polycrystalline state, they are very brittle and exhibit, in general, only small reversible deformations. By melt spinning, thin Cu-Al-Ni ribbons can be manufactured directly from the melt. Appropriate casting parameters can ensurea single layer columnar structure with a fibre texture, which significantly increases the maximal reversible strain in longitudinal direction. Cu-Al-Ni ribbons, containing 13, 14 and 15 wt.% Al were cast by free jet melt spinning. Because of the alloys' low thermal conductivity, the cooling rate was surprisingly low - considering the crystal grain size - significantly below 103 K/s. Therefore, wide ribbons having a single layer columnar and (except the ribbons containing 13 wt.% Al) completely martensiticstructure could not be obtained. Regardless the chemical composition, the ribbons have a single layer columnar structure only if the thickness does not exceed approximately 50 m, otherwise the structure consists of at least two layers of equiaxed grains. In as-cast condition, only ribbons containing 13 wt.% Al seem to be completely martensitic. Heat treatments at temperatures up to 900 °C improved the structure of 13 and 14 wt.% Al ribbons. All ribbons exhibit one-way shape memory effect in as-cast condition. Heat-treated ribbons containing 13 wt.% Al exhibited two-way shape memory effect already after one bending and heating cycle.
Ključne besede: metallurgy, shape memory alloys, Cu-Al-Ni alloy, microstructure, melt spinning
Objavljeno: 01.06.2012; Ogledov: 1120; Prenosov: 68
URL Povezava na celotno besedilo

Parameterization based shape optimization : theory and practical implementation aspects
Marko Kegl, 2005, izvirni znanstveni članek

Opis: This paper presents an approach to parameterization based shape optimization of statically loaded elastic structures. The shape parameterization is based on the design element technique and a rational Bezicr body is used to serve as the design element. Practical implementation issues related to the introduction of design variables are discussed briefly. The design sensitivity calculation is based on the discrete approach. The proposed solution process layout is based on a stand-alone optimization program which makes use of compatiblc analysis programs called simulators. For illustrationpurpose an example problem containing shape and sizing design variables is formulated and solved. The range of use of the proposed approachis illustrated with three further examples.
Ključne besede: mechanics, structure parameterization, shape optimal design, finite element mesh, body parameterization, design element, Bezier body
Objavljeno: 01.06.2012; Ogledov: 873; Prenosov: 42
URL Povezava na celotno besedilo

Microstructure and properties of shape memory alloys
Albert C. Kneissl, Elfride Unterweger, Gorazd Lojen, Ivan Anžel, 2005, izvirni znanstveni članek

Opis: This work addresses three topics: the generation of two-way shape memory effects in NiTi, NiTiW and CuAlNi wire materials and the investigation of the long term stability of these effects; investigations on thin CuAlNi films produced by PVD; investigation on thin CuAlNi ribbons produced by melt-spinning.
Ključne besede: metallurgy, shape memory alloys, properties, microstructure
Objavljeno: 01.06.2012; Ogledov: 918; Prenosov: 55
URL Povezava na celotno besedilo

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