Modeling Methods for Process Induced Distortions of CFRP-Parts produced in the Prepreg-Autoclave-Process PDF Download
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Author: Tim Frerich
Publisher: Logos Verlag Berlin GmbH
ISBN: 3832556435
Category : Technology & Engineering
Languages : en
Pages : 190
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Book Description
Process induced distortions are a challenge in the production of high-performance components made of carbon fiber reinforced plastics. In order to prevent the distortions, a prediction is of great utility. For components manufactured in the prepreg autoclave process, which is often used in the aerospace industry, prediction methods are investigated within this work. First, the state of the art is discussed and, based on this, two promising approaches are identified, which are further investigated and implemented: A rapid simulation approach and a complex one, which requires more effort but allows further investigations of the distortions. For the latter approach, new material models and rules of mixture are developed that take into account modern material architectures with interleaf layers. Using these material models, the observed material behavior can be represented more accurately than with material models from the literature. The results obtained by both approaches are compared with experimental results. A good agreement can be shown between the measurements and the simulation.
Author: Tim Frerich
Publisher: Logos Verlag Berlin GmbH
ISBN: 3832556435
Category : Technology & Engineering
Languages : en
Pages : 190
Get Book Here
Book Description
Process induced distortions are a challenge in the production of high-performance components made of carbon fiber reinforced plastics. In order to prevent the distortions, a prediction is of great utility. For components manufactured in the prepreg autoclave process, which is often used in the aerospace industry, prediction methods are investigated within this work. First, the state of the art is discussed and, based on this, two promising approaches are identified, which are further investigated and implemented: A rapid simulation approach and a complex one, which requires more effort but allows further investigations of the distortions. For the latter approach, new material models and rules of mixture are developed that take into account modern material architectures with interleaf layers. Using these material models, the observed material behavior can be represented more accurately than with material models from the literature. The results obtained by both approaches are compared with experimental results. A good agreement can be shown between the measurements and the simulation.
Author: R. Ganesh Narayanan
Publisher: Springer Nature
ISBN: 9813290722
Category : Technology & Engineering
Languages : en
Pages : 1092
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Book Description
This volume presents a selection of papers from the 2nd International Conference on Computational Methods in Manufacturing (ICCMM 2019). The papers cover the recent advances in computational methods for simulating various manufacturing processes like machining, laser welding, laser bending, strip rolling, surface characterization and measurement. Articles in this volume discuss both the development of new methods and the application and efficacy of existing computational methods in manufacturing sector. This volume will be of interest to researchers in both industry and academia working on computational methods in manufacturing.
Author: P.K. Mallick
Publisher: CRC Press
ISBN: 1466578238
Category : Technology & Engineering
Languages : en
Pages : 356
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Book Description
Polymer matrix composites are finding increasing number of applications due to their high weight-saving potential as well as unique characteristics, such as high strength-to-density ratio, fatigue resistance, high damping factor, and freedom from corrosion. While many textbooks are available on the mechanics of polymer matrix composites, few cover their processing.Processing of Polymer Matrix Composites fills this gap. The book focuses on the major manufacturing processes used for polymer matrix composites and describes process details, process parameters and their effects on properties and process-induced defects, and analytical and experimental methods used for understanding process conditions. The book describes fibers, thermosetting and thermoplastic polymers, and interface characteristics that are important from the standpoint of both design and processing. It also emphasizes the applications of process fundamentals for both continuous fiber and short fiber polymer matrix composites. In addition the book considers quality inspection methods, tooling, and manufacturing costs and environmental and safety issues.
Author: Sandro Wartzack
Publisher: Springer Nature
ISBN: 3031642252
Category :
Languages : en
Pages : 280
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Book Description
Author: Marissa Hughes
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
"Vacuum Bag Only, Out-of-Autoclave prepreg processing offers a sustainable, cost-efficient alternative to conventional autoclave manufacturing of high strength composite parts. Flat or low curvature parts made with Out-of-Autoclave prepregs have demonstrated comparable mechanical properties to their autoclave counterparts, yet challenges still remain with the fabrication of parts with more complex features. One area of concern is corner thickening in concave corners. Best practices for reducing this defect exist; however, a more robust processing technique is desirable. In this work, a manufacturing process is proposed that involves heating the laminate during the vacuum bag compaction at regular intervals in the layup process. The aim of these heated debulks is to reduce corner thickening early on in the manufacturing process by encouraging inter-ply slipping, precipitating air removal, and increasing the degree of impregnation.Before the process could be designed, its potential was assessed through material characterization and demonstrator studies. Inter-ply friction was characterized for debulked samples using pull-out tests, allowing for a better understanding of the forces required to encourage prepreg slip. Dynamic mechanical analysis was used to assess changes in the degree of cure caused by debulking, and found a slight increase in curing with increased debulk temperature and duration. Investigating the removal of air from a tool-part interface showed no impact of heating on air removal rate. It was observed that air returned to the plies if vacuum was released when the resin viscosity was low.Initial trials were run on flat plates. There was a decrease in short beam shear strength as the debulk dwell temperature increased. Meanwhile, low temperature hot debulks led to an increase in voids. L-brackets were manufactured on a concave tool. The hot debulk led to a 25% reduction in corner thickening and a 80% reduction in void content compared to the part debulked at room temperature. Such improvements in quality motivated the development of a more robust design for a hot debulk process. This procedure consisted of using an infrared lamp to heat the prepreg, dry carbon fibre fabric as breather to absorb the heat while evacuating gases, and a bath of dry ice used to cool the tool before the vacuum bag was vented.Parts were then made using this procedure with different debulk durations, temperatures, and frequencies. Longer hot debulks led to the greatest reduction in corner thickening, although improvements were observed for short, high temperature debulks. Long, high temperature debulks led to an increase in voids. Fewer debulks led to thicker corners and higher void contents, regardless of debulk temperature. Short beam shear strength was not impacted by the debulk procedure.A better understanding of the relationship between debulk time and temperature was necessary so an existing model was modified to simulate the trends observed. There are several barriers, both theoretical and empirical, that need to be overcome before this model can be used for process refinement. The work presented here contributes to the field in being among the first publicly available literature to methodically develop a detailed hot debulk procedure and to establish processing conditions to lead to improvements in part quality." --
Author: Carl T. Herakovich
Publisher: Wiley
ISBN: 9780471106364
Category : Technology & Engineering
Languages : en
Pages : 0
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Book Description
Comprehensive coverage of micro and macro mechanics of composite materials. * Case studies on designing composite materials and laminates. * Uses both SI and U.S. Customary units throughout. * This is the only book that covers laminated tubes and damage mechanics and the only one that presents an extensive array of actual experimental results for the nonlinear, inelastic response of polymeric and metallic matrix composites.
Author: Sanjay Mazumdar
Publisher: CRC Press
ISBN: 1420041983
Category : Technology & Engineering
Languages : en
Pages : 417
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Book Description
More and more companies manufacture reinforced composite products. To meet the market need, researchers and industries are developing manufacturing methods without a reference that thoroughly covers the manufacturing guidelines. Composites Manufacturing: Materials, Product, and Process Engineering fills this void. The author presents a fundamental
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 526
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Book Description
Author: Ulf Paul Breuer
Publisher: Springer
ISBN: 3319319183
Category : Technology & Engineering
Languages : en
Pages : 272
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Book Description
This book is based on lectures held at the faculty of mechanical engineering at the Technical University of Kaiserslautern. The focus is on the central theme of societies overall aircraft requirements to specific material requirements and highlights the most important advantages and challenges of carbon fiber reinforced plastics (CFRP) compared to conventional materials. As it is fundamental to decide on the right material at the right place early on the main activities and milestones of the development and certification process and the systematic of defining clear requirements are discussed. The process of material qualification - verifying material requirements is explained in detail. All state-of-the-art composite manufacturing technologies are described, including changes and complemented by examples, and their improvement potential for future applications is discussed. Tangible case studies of high lift and wing structures emphasize the specific advantages and challenges of composite technology. Finally, latest R&D results are discussed, providing possible future solutions for key challenges such as low cost high performance materials, electrical function integration and morphing structures.
Author: Mahmood M. Shokrieh
Publisher: Woodhead Publishing
ISBN: 0857098594
Category : Technology & Engineering
Languages : en
Pages : 407
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Book Description
Residual stresses are a common phenomenon in composite materials. They can either add to or significantly reduce material strength. Because of the increasing demand for high-strength, light-weight materials such as composites and their wide range of applications in the aerospace and automotive industries, in civil infrastructure and in sporting applications, it is critical that the residual stresses of composite materials are understood and measured correctly. The first part of this important book reviews destructive and non-destructive testing (NDT) techniques for measuring residual stresses. Various mathematical (analytical and numerical) methods for calculation of residual stresses in composite materials are also presented. Chapters in the first section of the book discuss the simulated hole drilling method, the slitting/crack compliance method, measuring residual stresses in homogeneous and composite glass materials using photoelastic techniques, and modeling residual stresses in composite materials. The second part of the book discusses residual stresses in polymer matrix, metal-matrix and a range of other types of composites. Moreover, the addition of nanoparticles to the matrix of polymeric composites as a new technique for reduction of residual stresses is discussed. Residual stresses in composite materials provides a comprehensive overview of this important topic, and is an invaluable reference text for both academics and professionals working in the mechanical engineering, civil engineering, aerospace, automotive, marine and sporting industries. Reviews destructive and non-destructive testing (NDT) techniques for measuring residual stresses Discusses residual stresses in polymer matrix, metal-matrix and other types of composite Considers the addition of nanoparticles to the matrix of polymeric composites as a new technique for reduction of residual stresses
