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Thermo-mechanical and micro-structural characterization of shape memory polymer foamsDi Prima, Matthew Allen. January 2009 (has links)
Thesis (M. S.)--Materials Science and Engineering, Georgia Institute of Technology, 2009. / Committee Chair: Gall, Ken; Committee Co-Chair: McDowell, David; Committee Member: Guldberg, Robert; Committee Member: Sanderson, Terry; Committee Member: Shofner, Meisha; Committee Member: Tannenbaum, Rina.
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The development of in-situ foamed sandwich panelsProvó Kluit, Pieter-Willem Christiaan, January 1900 (has links)
Thesis (doctoral)--Technische Universiteit Delft, 1997. / Includes bibliographical references.
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An experimental study of the deformational and performance characteristics of foamed bitumen stabilised pavements : a thesis submitted in partial fulfilment of the requirements for the degree pf Doctor of Philosophy in the University of Canterbury /Gonzalez, Alvaro, January 2009 (has links)
Thesis (Ph. D.)--University of Canterbury, 2009. / Typescript (photocopy). Includes bibliographical references. Also available via the World Wide Web.
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Analysis of carbon foams by finite element method /Druma, Adriana M. January 2005 (has links)
Thesis (Ph.D.)--Ohio University, March, 2005. / Includes bibliographical references (leaves 122-129)
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Shear modulii for cellular foam materialsStone, Robert Michael, 1957- January 1989 (has links)
The use of cellular foam as a core material in light-weight structural applications is of considerable interest. However, advances in this technology have been limited due to the lack of information concerning the macroscopic material behavior of cellular foams. Of particular interest in the design of composite structures is the shear modulus, G, of the core material, which must be established with a high degree of accuracy. Current ASTM test methods for shear modulus determination were researched and found inadequate for testing cellular foam materials. The difficulty in testing foam and the inaccuracies associated with the standard test methods established the need for the development of a test method for these materials. The test method (test fixture and test procedure) developed for cellular foam materials is presented. The design of the test fixture and the finite element analysis performed to determine fixture accuracy are discussed in detail. Additionally, the test procedure is presented, as well as the results for the 32 tests performed.
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Stockpile life of foam stabilised material and the implications for labour intensive constructionChasi, Brian Takaona January 1998 (has links)
A project report submitted to the Faculty of Engineering, University of the
Witwatersrand, Johannesburg, in partial fulfillment of the requirements for the degree
of Master of Science in Engineering. Johannesburg 1998. / Various studies have been done to show that labour-based construction can meet the
high standards normally required in the construction of roads. The organisational
requirements that were needed to ensure the efficient use of labour have also been
dealt with in various studies. Tile need for alleviation of poverty, unemployment and the
negative social impact thereof by increasing the labour input in construction is
understood by all concerned.
A further step is however necessary before the idea of increasing the . labour
component in any kind of roadwork can be taken seriously. Engineers need to move
forward from the policy and organisational issues associated with labour intensive
construction and start to provide designers with sound and innovative engineering
solutions to overcome the hurdles experienced on the ground.
The study looks at the process of foam bitumen stabilisation of soils and gravels with
a view of utilising this innovative method for labour intensive construction. The material
after having been stabilised can be placed in a stockpile. Actual durations that the
material can safely remain in stockpile have been determined in this study to be in
excess of six months for recycled asphalt and in excess of four months for the foam
stabilised sand. Foam stabilised gravel was also studied and showed that after a year
in stockpile the material failed probably due to a weakening of the bitumen and
aggregate bond. Covering the stockpiled material did not show any significant
difference to that of a similar uncovered stockpile. The position within the stockpile also
did not have much effect on the engineering properties of the stoc piled material.
The fact that the foam stabilised material can be worked on when cold and that it can
be stockpiled for several months implies that the material is labour friendly and can be
used in labour intensive construction of road base course layers or wearing course
layers. / AC2017
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Radiation characteristics of rigid foam insulationStern, Curtis Harold January 1982 (has links)
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1982. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING / Includes bibliographical references. / by Curtis Harold Stern. / B.S.
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Shock wave interaction with porous compressible foamsAtkins, Mark D January 2016 (has links)
Two foams, a polyether (density 32.5 kg/m3) and a polyester (density 38 kg/m3) foam were tested in a shock tube to analyze the interaction of a normal shock wave and a compressible porous material. The foam specimens were placed in the shock tube test section! the foam being bounded by two steel walis, two glass windows and a solid back plate. The compression chamber of the shock tube was pressurized and the diaphragm separating the compression chamber and the expansion chamber was ruptured, thus producing a normal shock wave which travels down the shock tube and strikes the foam. Piezoelectric pressure transducers 'vvera used to record the pressure before, alongside and behind the foam. A complete set of schlieren photographs, recording the interaction of the incident shock wave and the porous material were taken for each foam. A method ,tortracking the path of particles of foam (path photographs) was developed. Combining the information obtained from the pressure records, schlieren photographs and path photographs a complete picture of the shock wave foam interaction was developed. All the gas waves were identified and analyzed, A foam wave (velocity 90 m/s) travelling through the skeleton of the material was discovered. A physical model was developed to explain the high pressure recorded behind the foam. This model is based upon the foam being compressed and forming an almost solid piston, thus forcing the trapped gas into a diminishing volume and creating a high pressure behind the foam. The theoretical analyses of Monti (30), Gel'fand (20) and IBvozdeva (22) were analyz.ed and compared. The general finding was that for the range of incident mach numbers 1.~i1 to 1.46 Monti's analysis under predicts the reflected Mach number by 3 % and Gel'fand's analysis over predicts the reflected Mach number by 6 %. The coefficient of pressure increase (the ratio of the maximum pressure recorded behind the foam to the equivalent pressure recorded during ~he reflection of a shock wave from a solid wall) as predicted iJy Gvoz.deva's ane.lysisfor the polyether foam lies wjthin the scatter of the experimental results. However for the polyester foam Gvozdeva's analysis under predicts the coefficient of pressure increase by 15%. / GR 2016
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Three-dimensional finite-deformation multiscale modeling of elasto-viscoplastic open-cell foams in the dynamic regimeRomero, Pedro A. January 2008 (has links)
Thesis (Ph. D.)--Rutgers University, 2008. / "Graduate Program in Mechanical and Aerospace Engineering." Includes bibliographical references (p. 121-129).
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Supercritical CO2 foamed biodegradable polymer blends of polycaprolactone and Mater-Bi.Ogunsona, Emmanuel Olusegun 12 1900 (has links)
Supercritical CO2 foam processing of biopolymers represents a green processing route to environmentally friendly media and packaging foams. Mater-Bi, a multiconstituent biopolymer of polyester, starch and vegetable oils has shown much promise for biodegradation. The polymer, however, is not foamable with CO2 so blended with another polymer which is. Polycaprolactone is a biopolymer with potential of 4000% change in volume with CO2. Thus we investigate blends of Mater-Bi (MB) and polycaprolactone (PCL) foamed in supercritical CO2 using the batch process. Characterization of the foamed and unfoamed samples were done using X-ray diffraction (XRD), differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). Micrographs of the samples from the SEM revealed that the cell size of the foams reduced and increased with increase in MB concentration and increase in the foaming temperature respectively. Mechanical tests; tensile, compression, shear and impact were performed on the foamed samples. It was noted that between the 20-25% wt. MB, there was an improvement in the mechanical properties. This suggests that at these compositions, there is a high interaction between PCL and MB at the molecular level compared to other compositions. The results indicate that green processing of polymer blends is viable.
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