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Author: Publisher: ISBN: Category : Languages : en Pages : 8
Book Description
The room temperature mechanical properties of a closed-cell, polyurethane encapsulant foam have been measured as a function of foam density. Tests were performed on both unfilled and filler reinforced specimens. Over the range of densities examined, the modulus of the unloaded foam could be described by a power-law relationship with respect to density. This power-law relationship could be explained in terms of the elastic compliance of the cellular structure of the foam using a simple geometric model found in the literature. The collapse stress of the foam was also found to exhibit a power-law relationship with respect to density. Additions of an aluminum powder filler increased the modulus relative to the unfilled foam.
Author: Publisher: ISBN: Category : Languages : en Pages : 8
Book Description
The room temperature mechanical properties of a closed-cell, polyurethane encapsulant foam have been measured as a function of foam density. Tests were performed on both unfilled and filler reinforced specimens. Over the range of densities examined, the modulus of the unloaded foam could be described by a power-law relationship with respect to density. This power-law relationship could be explained in terms of the elastic compliance of the cellular structure of the foam using a simple geometric model found in the literature. The collapse stress of the foam was also found to exhibit a power-law relationship with respect to density. Additions of an aluminum powder filler increased the modulus relative to the unfilled foam.
Author: D. S. Schwartz Publisher: ISBN: Category : Technology & Engineering Languages : en Pages : 352
Book Description
Presents 43 papers from the April 1998 symposium discussing recent developments in the field including polymer-, ceramic-, and metal-based materials. The contents are organized into eight sections which treat the mechanical behavior of solid foams, properties of metallic foams, the manufacture of solid foams, other foam materials and processes, hot isostatically compacted and expanded materials, applications and design principles of foams, and GASAR materials. Annotation copyrighted by Book News, Inc., Portland, OR
Author: Nagesh Kasichainula Publisher: ISBN: Category : Polyurethanes Languages : en Pages : 200
Book Description
Rigid polyurethane foams are very widely used in a variety of structural and non-structural applications. For example, it may be used as an insulator, in sandwich layered composite panels, and as filler for damping in hollow structural members. Reinforced polyurethane rigid foams are used in the automotive industry for body parts such as wings, spoilers, boot lids and doors. Other areas of application include stadium seating and furniture, construction panels, electronic encapsulants, radomes and structural supports. In this investigation, reinforced rigid polyurethane foams have been developed and characterized for their microstructure, quasi-static mechanical properties and also their deformation response to impact loading. The polyurethane foam will be reinforced with very short, 400 micron length, milled E-glass fibers and nano-clay particles. Hybrid foams were also fabricated which consisted of both nano-clay and milled E-glass fibers.
Author: Cristina Prisacariu Publisher: Springer Science & Business Media ISBN: 3709105145 Category : Technology & Engineering Languages : en Pages : 276
Book Description
A comprehensive account of the physical / mechanical behaviour of polyurethanes (PU ́s) elastomers, films and blends of variable crystallinity. Aspects covered include the elasticity and inelasticity of amorphous to crystalline PUs, in relation to their sensitivity to chemical and physical structure. A study is made of how aspects of the constitutive responses of PUs vary with composition: the polyaddition procedure, the hard segment, soft segment and chain extender (diols and diamines) are varied systematically in a large number of systems of model and novel crosslinked andthermoplastic PUs. Results will be related to: microstructural changes, on the basis of evidence from x-ray scattering (SAXS and WAXS), and also dynamic mechanical analyses (DMA), differential scanning calorimetry (DSC) and IR dichroism. Inelastic effects will be investigated also by including quantitative correlations between the magnitude of the Mullins effect and the fractional energy dissipation by hysteresis under cyclic straining, giving common relations approached by all the materials studied. A major structural feature explored is the relationship between the nature of the hard segment (crystallising or not) and that of the soft segments. Crystallinity has been sometimes observed in the commercial PUs hard phase but this is usually limited to only a few percent for most hard segment structures when solidified from the melt. One particular diisocyanate, 4,4’-dibenzyl diisocyanate (DBDI) that, in the presence of suitable chain extenders ( diols or diamines), gives rise to significant degrees of crystallinity [i-iii] and this is included in the present work. Understanding the reaction pathways involved, in resolving the subtle morphological evolution at the nanometre level, and capturing mathematically the complex, large-deformation nonlinear viscoelastic mechanical behaviour are assumed to bring new important insights in the world basic research in polyurethanes and towards applied industrial research in this area.
Author: C. H. Jenkins Publisher: Computational Mechanics ISBN: Category : Philosophy Languages : en Pages : 304
Book Description
Talks about the structural compliance in nature and human technology. The subject of compliant structures in nature and engineering is timely and important. A summary of the features of these structures, this volume demonstrates a mapping between naturally compliant structures and the promise and opportunity commensurate in human engineering.
Author: Michael Szycher, Ph.D Publisher: CRC Press ISBN: 1439839581 Category : Technology & Engineering Languages : en Pages : 1147
Book Description
A practical handbook rather than merely a chemistry reference, Szycher's Handbook of Polyurethanes, Second Edition offers an easy-to-follow compilation of crucial new information on polyurethane technology, which is irreplaceable in a wide range of applications. This new edition of a bestseller is an invaluable reference for technologists, marketers, suppliers, and academicians who require cutting-edge, commercially valuable data on the most advanced uses for polyurethane, one of the most important and complex specialty polymers. internationally recognized expert Dr. Michael Szycher updates his bestselling industry "bible" With seven entirely new chapters and five that are revised and updated, this book summarizes vital contents from U.S. patent literature—one of the most comprehensive sources of up-to-date technical information. These patents illustrate the most useful technology discovered by corporations, universities, and independent inventors. Because of the wealth of information they contain, this handbook features many full-text patents, which are carefully selected to best illustrate the complex principles involved in polyurethane chemistry and technology. Features of this landmark reference include: Hundreds of practical formulations Discussion of the polyurethane history, key terms, and commercial importance An in-depth survey of patent literature Useful stoichiometric calculations The latest "green" chemistry applications A complete assessment of medical-grade polyurethane technology Not biased toward any one supplier’s expertise, this special reference uses a simplified language and layout and provides extensive study questions after each chapter. It presents rich technical and historical descriptions of all major polyurethanes and updated sections on medical and biological applications. These features help readers better understand developmental, chemical, application, and commercial aspects of the subject.
Author: Bibin John Publisher: Elsevier Inc. Chapters ISBN: 0128090723 Category : Technology & Engineering Languages : en Pages : 69
Book Description
Syntactic foams are particulate polymer matrix composite materials consisting of hollow microspheres dispersed in a matrix. The matrix used in syntactic foams can be polymer, metal, or ceramic. Polymer matrices, particularly the thermosetting polymers, have been the most widely accepted matrices in syntactic foams. From the processing and application point of view, thermosetting syntactic foams have many advantages compared to thermoplastic ones. This chapter deals with syntactic foams based on various thermosetting resins and the chemistry of the resin systems. The resin systems are mainly phenolic, epoxy, cyanate ester, siloxane, polybenzoxazine, bismaleimide, and their blends. Apart from a brief chemistry of the parent resin systems, their syntactic foams have been described in detail. The aspects discussed are their processing, physical, thermal, and mechanical properties, applications, and degradation. Their properties can be engineered by a choice of matrix, microcell structure and its concentration, reinforcement, toughners, etc. While the thermal and thermo-physical characteristics are dictated by resin, mechanical and fracture characteristics are decided by both components. While epoxy, cyanate ester, and other such compounds provide structural syntactic foams, phenolics and their new generation versions provide thermo-structural materials. Syntactic foam ablators have made possible interplanetary space missions. Novel engineering concepts like lightweight self-healing give scope for extended applications of these systems. The recent advances in these areas are also discussed. These special materials with high specific strength are slated to replace conventional structural and thermo-structural materials in related engineering applications ranging from domestic to aerospace and defense.
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Author: D. S. Schwartz
Author: Nagesh Kasichainula
Author: Cristina Prisacariu
Author: C. H. Jenkins
Author: Michael Szycher, Ph.D
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Author: Bibin John
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