Mechanical Development Of Thermosets During Cure
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Mechanical Development Of Thermosets During Cure
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Author : John Roberto Puentes Gil
language : en
Publisher:
Release Date : 2017
Mechanical Development Of Thermosets During Cure written by John Roberto Puentes Gil and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
Novel experimental and modeling techniques to quantify and correlate the kinetic and mechanical development of thermosets during cure are evaluated in this work. Commercial epoxy adhesives and prepregs are analyzed using standard protocols and improved protocols proposed here. First, the use of initial fast ramps in heat flux differential scanning calorimetry (DSC), up to 500 K/min, was used to follow the isothermal kinetic development of adhesives. More complete kinetics were captured while mitigating cure during the heating step. This was achieved with the optimization of the electronic furnace parameters. The enthalpy spike at the dynamic-to-isothermic transition remains an issue. Preliminary empirical shifts are proposed to compensate the signal lag. This method was used to represent the kinetics in the time-temperature-transformation (TTT) diagram including correction for filler, moisture, and pre-cure history. The formal kinetic method was used giving a simpler model compared to the conventional Kamal-Sourour equation. Second, the moduli development was captured from the gel point up to the fully cured state in a single DMA three-point bending test. A new sample was used by sandwiching a partially cured plate between two fully cured plates of adhesive. Kinetic, viscosity, gel point and shrinkage information were used to delimit and select parameters, the upper, and lower bounds of the moduli. Sandwich beam elastic theory was used to quantify the moduli of samples during cure. This method reduced beam compliance and eliminated signal noise. The previous techniques still measured kinetic and mechanical development using different instruments, masses, sample geometries, and conditions. Third, to solve this problem, an in-situ method attaching ultrasonic transducers and a Raman probe to a mold chamber was used. The degree of cure and moduli were measured simultaneously giving a closer interpretation of the cure-mechanical development interaction. Raman spectroscopy captured more reaction at the initial and propagation stages compared to DSC analyses. It also measured more accurately the end stage governed by diffusion mechanisms. This work concluded by exploring warpage measurements using a laser measurement device. The method allowed for the capture of a 3D rendering of the mold and the final component. More accurate warpage was quantified for the case of angle distortion in L-shaped parts. The angle distortion was found to strongly depend on the profile thickness. Steps towards implementing the results of this work in a numerical simulation of warpage of composite parts are detailed.
Thermosets
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Author : Qipeng Guo
language : en
Publisher: Woodhead Publishing
Release Date : 2017-11-14
Thermosets written by Qipeng Guo and has been published by Woodhead Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-11-14 with Technology & Engineering categories.
In this new edition, Thermosets: Structure, Properties, and Applications builds on and updates the existing review of mechanical and thermal properties, as well as rheology and curing processes of thermosets, and the role of nanostructures in thermoset toughening. All chapters have been updated or re-written, and new chapters have been added to reflect ongoing changes and developments in the field of thermosetting materials and the applications of these materials. Applications of thermosets are the focus of the second part of the book, including the use of thermosets in the building and construction industry, aerospace technology and as insulation materials. Thermoset adhesives and coatings, including epoxy resins, acrylates and polyurethanes are also discussed, followed by a review of thermosets for electrical applications. New chapters include coverage of thermoset nanocomposites, recycling issues, and applications such as consumer goods, transportation, energy and defence. With its distinguished editor and international team of expert contributors, the second edition of Thermosets: Structure, Properties, and Applications is an essential guide for engineers, chemists, physicists and polymer scientists involved in the development, production and application of thermosets, as well as providing a useful review for academic researchers in the field. Links structure, properties, and applications, making this book relevant to both academia and engineers in industry Includes entirely new chapters on the use of thermosets in aerospace, transport, defense, and a range of consumer applications Enables practitioners to stay current on the latest developments in recycling of thermosets and their composites
Cure Of Thermosetting Resins
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Author : Jean-Maurice Vergnaud
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Cure Of Thermosetting Resins written by Jean-Maurice Vergnaud and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Technology & Engineering categories.
The process of cure of thermosets is rather complex, and good knowledge of the various steps and different problems is necessary for the user. For instance, the following basic facts characterise the cure of thermosets: 1. In the same way as rubbers, thermosets are generally polymerised and processed in a simple operation which involves the irreversible transformation of a low molecular weight resin in viscous liquid state into a solid network polymer. The process of cure is thus much more important for thermosets or rubbers than for thermo plastics, because if something goes wrong during the cure process of thermosets, the final products may have undersirable properties and will be of no use or value, while the thermoplastic material can be melted again to make a new material. 2. In contrast with rubbers, a high exothermic cure reaction is the aspect of fundamental importance in the cure process for thermo sets. This high enthalpy of cure associated with a rather low thermal conductivity can give rise to an excessively high tem perature which may cause discoloration and degradation of the material, and also to substantial temperature gradients. The mat erial is thus heterogeneous during the process of cure, and these temperature-time histories in the resin may have some effects on the properties of the final material. 3. Moreover, the increase in production following the reduction in time of the cure cycle necessitates the use of a higher mould temperature.
Recent Advances And Applications Of Thermoset Resins
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Author : Debdatta Ratna
language : en
Publisher: Elsevier
Release Date : 2022-02-19
Recent Advances And Applications Of Thermoset Resins written by Debdatta Ratna and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-02-19 with Technology & Engineering categories.
Recent Advances and Applications of Thermoset Resins, Second Edition provides a reference source for anyone interested in understanding the chemistry, processing, properties, composites and applications of thermoset resins. Sections cover the chemistry of thermoset resins and recent advances in various aspects, including toughening, micro-reinforcement, nano-reinforcement, simultaneous nano-reinforcement and toughening. The book provides detailed information on synthesis, characterization and processing techniques. A critical review of the latest advances in thermoset-based composites and nanocomposites is also presented, along with future directions of research in various areas of thermoset resins. This is a valuable resource for researchers, scientists and advanced students in polymer science, plastics engineering, adhesives and coatings, composites, and materials engineering, as well as R&D professionals, engineers and manufacturers with an interest in thermoset resins and materials for advanced applications. Offers comprehensive information on the chemistry, processing, properties and applications of thermoset resins Presents and reviews cutting-edge developments in the field, including sections on composites, nanocomposites, bio-based resins and 3D printing Includes the latest methods for analysis, characterization, testing and evaluation of thermoset materials
Old Views Of Minneapolis
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Author :
language : en
Publisher:
Release Date : 19??
Old Views Of Minneapolis written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 19?? with Minneapolis (Minn.) categories.
Handbook Of Thermoset Plastics
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Author : Hanna Dodiuk
language : en
Publisher: William Andrew
Release Date : 2021-10-25
Handbook Of Thermoset Plastics written by Hanna Dodiuk and has been published by William Andrew this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-10-25 with Technology & Engineering categories.
Handbook of Thermoset Plastics, Fourth Edition provides complete coverage of the chemical processes, manufacturing techniques and design properties of each polymer, along with its applications. This new edition has been expanded to include the latest developments in the field, with new chapters on radiation curing, biological adhesives, vitrimers, and 3D printing. This detailed handbook considers the practical implications of using thermoset plastics and the relationships between processing, properties and applications, as well as analyzing the strengths and weakness of different methods and applications. The aim of the book is to help the reader to make the right decision and take the correct action on the basis of informed analysis – avoiding the pitfalls the authors’ experience has uncovered. In industry, the book supports engineers, scientists, manufacturers and R&D professionals working with plastics. The information included will also be of interest to researchers and advanced students in plastics engineering, polymer chemistry, adhesives and coatings. Offers a systematic approach, guiding the reader through chemistry, processing methods, properties and applications of thermosetting polymers Includes thorough updates that discuss current practice and the new developments on biopolymers, nanotechnology, 3D printing, radiation curing and biological adhesives Uses case studies to demonstrate how particular properties make different polymers suitable for different applications Covers end-use and safety considerations
Computational Methods And Experiments In Materials Characterization Iii
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Author : C. A. Brebbia
language : en
Publisher: WIT Press
Release Date : 2007
Computational Methods And Experiments In Materials Characterization Iii written by C. A. Brebbia and has been published by WIT Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Technology & Engineering categories.
Until recently, engineering materials could be characterized successfully using relatively simple testing procedures. As materials technology advances, interest is growing in materials possessing complex meso-, micro- and nano-structures, which to a large extent determine their physical properties and behaviour. The purposes of materials modelling are many: optimization, investigation of failure, simulation of production processes, to name but a few. Modelling and characterisation are closely intertwined, increasingly so as the complexity of the material increases. Characterisation, in essence, is the connection between the abstract material model and the real-world behaviour of the material in question. Characterisation of complex materials therefore may require a combination of experimental techniques and computation. This book publishes papers presented at the Third International Conference on Computational Methods and Experiments in Material Characterisation.Topics covered include: Composites; Ceramics; Alloys; Cements and Cement Based Materials; Biomaterials; Thin Films and Coatings; Advanced Materials; Imaging Analysis; Thermal Analysis; New Methods; Surface Chemistry, Nano Indentation; Continuum Methods; Particle Models; Damage Mechanics; Innovative Techniques; Stochastic Methods.
Cure Cycle Optimization In Polymer Composites
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Author :
language : en
Publisher:
Release Date : 2000
Cure Cycle Optimization In Polymer Composites written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.
This work includes experimental and theoretical study of the effect of cure cycles on the development of cure-induced stresses in thermoset polymer composites. The experimental part includes modifying a newly developed test method to monitor the development of cure-induced stresses in thermoset polymer composites. Test results gave a clear understanding of the mechanisms of stresses development. The test method was further modified with a closed loop feedback control system to modify the cure cycles to reduce cure-induced stresses. Test results show that the modified cure cycles reduce residual stresses in composite laminates. The theoretical part included the development of a mechanical optimization model to study the effect of changing the cure cycle on the development of residual stresses in composite laminates. The model was used to generate cure cycles that reduce residual stresses in thermoset polymer composites. Findings of the theoretical modeling were found to agree well with those of the experimental study.
Cure Monitoring For Composites And Adhesives
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Author : David Mulligan
language : en
Publisher: iSmithers Rapra Publishing
Release Date : 2003
Cure Monitoring For Composites And Adhesives written by David Mulligan and has been published by iSmithers Rapra Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Science categories.
This report focuses on in-line cure monitoring as a key way of optimising production. The bulk of this review is devoted to coverage of the range of techniques used for cure monitoring. Consideration is also given to other topics relevant to the implementation of cure monitoring processes. An additional indexed section containing several hundred abstracts from the Rapra Polymer Library database gives useful references for further reading.
Proceedings Of The Tenth International Conference On Composite Materials
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Author : Anoush Poursartip
language : en
Publisher: Woodhead Publishing
Release Date : 1995
Proceedings Of The Tenth International Conference On Composite Materials written by Anoush Poursartip and has been published by Woodhead Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Composite materials categories.