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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 12 of 12 for “"biaxial stretching"”.
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On the puncture strength of rubber
… determined using a model experiment based on the biaxial stretching of rubber by inflation. The energy stored in the rubber surrounding the indentor was calculated. The contribution of these energies was shown to be small. The puncture test was used to study the strength of thick rubber blocks …
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CONFINED LAYERED POLYMERIC SYSTEMS FOR PACKAGING ANDCAPACITOR APPLICATIONS
… under nanolayer confinement. In addition, both biaxial stretching and isothermal melt recrystallization were used as an additional approach to manipulate the morphologies of these confined polymers. The synergistic combination of nanolayering, biaxial stretching, and isothermal recrystallization …
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Application of image analysis techniques to determine strain distribution in leather
… with these lines of tightness. Secondly, biaxial stretching of leather by a series of actuators for each axis indicated the lines of tightness along the actuator with lower strain values. Thirdly, the strain was measured when the leather was stretched along number of known axes. This …
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A study of processing methods for producing biaxial orientation in thermotropic liquid crystalline polymers
Four methods of biaxial deformation were considered in an attempt to obtain biaxial orientation and properties in two thermotropic copolyesters: hydroxybenzoic acid-co-polyethylene terephthalate (HBA/PET) and hydroxybenzoic acid/2, 6 hydroxynaphthoic acid (HBA/HNA). They consisted of solid phase …
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Modelling the constitutive behaviour of poly(ethylene terephthalate) for the stretch blow moulding process
… experimental work, including conventional biaxial stretching tests and free stretch-blow tests, was carried out to characterize the mechanical properties of the material. These tests revealed the properties of aPET under displacement-controlled deformation and load-controlled …
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The relationship between texture and formability in sheet metals
… loci,formability parameters, earing and the stretching behaviour of a range of differently textured FCC and BCC materials were investigated both theoretically and expereimentally. The Crystallite Orientation Distribution. Function (CODF), expressed in terms of a series of spherical harmonics, …
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Designing liquid repellent surfaces for fabrics, feathers and fog
… or switched using either thermal annealing or biaxial stretching. Army Combat Uniform fabrics are rendered oleophobic, thus opening the way to optimize omniphobic army uniforms. The wettability of molecules similar to fluorodecyl POSS is investigated by measuring the contact angles with liquids …
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The influence of multi-walled carbon nanotubes on the properties of polypropylene nanocomposite. The enhancement of dispersion and alignment of multiwalled carbon nanotube in polypropylene nanocomposite and its effect on the mechanical, thermal, rheological and electrical properties.
… subjected to micromoulding, fibre spinning and biaxial stretching processes and the resultant properties investigated. Application of post-compounding process was found to have significant effect on mechanical and rheological properties of the nanocomposite. Stiffness and strength of the …
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Experimental characterization and modeling of the plastic behavior of a thirdgeneration advanced high strength steel sheet
… by means of the hydraulic bulge test, and the biaxial anisotropy coefficient was obtained using the disc compression test. The formability was investigated by means of the hole expansion, Erichsen cupping, and forming limit curve (FLC) test procedures. The limit strains were defined by ISO …
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A combined experimental and computational framework to optimise processing and design of poly(L-lactic acid) bioresorbable stents
… stent was replicated using a custom-built biaxial tensile test machine in order to assess the improvement in short-term (pre-degradation) mechanical properties of extruded poly(L-lactic acid) (PLLA). Results of an extensive experimental programme to characterise the post processing …
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Preparation and investigation of polymer-foam films and polymer-layer systems for ferroelectrets
… properties than PET. A “voiding + inflation + stretching” process has been specifically developed to prepare PEN foams. Solid PEN films are saturated with supercritical CO2 at high pressure and then thermally voided at high temperatures. Controlled inflation (Gas-Diffusion Expansion or GDE) is …
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Finite element modelling the forming of components for portable electronic devices
… range of 130–155 ⁰C. Extensive in-plane biaxial testing used to uncover the specific contributions of external variables on the observed stress-strain behaviour highlighted the anisotropic non-linear viscoelastic behaviour of the films – with strong dependence of the yield and strain …