Composites Manufacturing最新文献_第2页

Techniques in rheological measurements 流变学测量技术

Composites Manufacturing Pub Date : 1995-01-01 DOI: 10.1016/0956-7143(95)90023-3

J. Karger-Kocsis

引用次数: 21

Development of a numerical code that simulates combined heat transfer, resin flow and compaction during composites processing 在复合材料加工过程中模拟复合传热、树脂流动和压实的数值代码的开发

Composites Manufacturing Pub Date : 1995-01-01 DOI: 10.1016/0956-7143(95)99648-C

L. Tredoux, J. Van der Westhuizen

{"title":"Development of a numerical code that simulates combined heat transfer, resin flow and compaction during composites processing","authors":"L. Tredoux, J. Van der Westhuizen","doi":"10.1016/0956-7143(95)99648-C","DOIUrl":"10.1016/0956-7143(95)99648-C","url":null,"abstract":"<div><p>The cure and consolidation of thermoset composite materials is a complex physical process involving combined heat transfer, resin curing, fibre bed compaction and fluid flow. Finite difference simulations for either the heat transfer part of this process or for the resin flow part can be found in the literature. The present paper develops and implements the finite element form of the equations governing composites processing and successfully combines resin flow and heat transfer modelling through the temperature-dependent viscosity. Specifically, this paper (i) sets up the finite element form of the Fourier heat conduction equation and the Gutowski/Davé resin flow equation through the Ritz formulation, (ii) overviews the computer implementation of these equations and (iii) presents selected output results to demonstrate the engineering value of the simulation program. An autoclave process is analysed as a test case. The results illustrate that the developed computer code (FCURE) combines existing mathematical models with the versatility of the finite element method into a simulation tool with engineering potential.</p></div>","PeriodicalId":100299,"journal":{"name":"Composites Manufacturing","volume":"6 2","pages":"Pages 85-92"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-7143(95)99648-C","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89200194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 18

The influence of preform joints on the processing of RTM composites 预成形接头对RTM复合材料加工的影响

Composites Manufacturing Pub Date : 1995-01-01 DOI: 10.1016/0956-7143(95)93710-2

D.A Steenkamer , D.J Wilkins , V.M Karbhari

{"title":"The influence of preform joints on the processing of RTM composites","authors":"D.A Steenkamer , D.J Wilkins , V.M Karbhari","doi":"10.1016/0956-7143(95)93710-2","DOIUrl":"10.1016/0956-7143(95)93710-2","url":null,"abstract":"<div><p>In order to develop preforms for large complex parts capable of meeting the demands of global and local loading conditions, resin transfer moulded parts are typically broken down into multiple elements. A separate preform is developed for each of these sub-sections, which are then assembled in the mould cavity and combined by the moulding process. While the decomposition of a structure into sub-sections eases the burden on the preforming operation(s) to form the desired shape with the appropriate microstructure, it also raises the issue of joining these multi-element preform sections. In previous composites applications, the presence of a joint was traditionally considered only in terms of its influence on the performance of the part, since the fibre and resin were already combined into pre-impregnated tape. However, resin transfer moulding (RTM) is a two-step process: fibre preforming followed by resin impregnation and cure. Since the resin must flow through the preform and wet-out the individual fibre bundles, the inclusion of a preform joint in the design of an RTM part's microstructure must be considered in terms of processing (resin flow and wet-out) as well as performance. In this paper we examine the influence of preform joint on resin flow through both computational and experimental approaches. The implications of such joints on the design and processing of RTM parts is discussed.</p></div>","PeriodicalId":100299,"journal":{"name":"Composites Manufacturing","volume":"6 1","pages":"Pages 23-34"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-7143(95)93710-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86746784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Bending of fibre-reinforced thermoplastic sheets 纤维增强热塑性薄板的弯曲

Composites Manufacturing Pub Date : 1995-01-01 DOI: 10.1016/0956-7143(95)95009-N

T.A. Martin, D. Bhattacharyya, I.F. Collins

{"title":"Bending of fibre-reinforced thermoplastic sheets","authors":"T.A. Martin, D. Bhattacharyya, I.F. Collins","doi":"10.1016/0956-7143(95)95009-N","DOIUrl":"10.1016/0956-7143(95)95009-N","url":null,"abstract":"<div><p>When forming continuous fibre-reinforced thermoplastic (CFRT) sheets into three-dimensional components, interply shearing may be necessary in order to accommodate the out-of-plane bending because the fibres severely constrain the deformation along the fibre directions within their planes. Furthermore, thermoforming takes place at elevated temperatures so that the molten matrix polymer becomes fluid. These two factors are of prime importance in analysing any forming process with thermoplastic composite materials. This paper examines the process of forming unidirectional Plytron® (a glass fibre-reinforced polypropylene composite, originally developed by ICI, UK) sheets into V-bends at a constant elevated temperature, and compares the experimental results with those predicted by an analytical model for plane strain bending of an incompressible Newtonian fluid reinforced with a single family of inextensible fibres. The shape of a strip as it is formed, the effects of temperature and forming speed on the forming loads are also investigated. A major conclusion from this study is that Plytron sheets demonstrate a viscoelastic response when formed within their melting range and the degree of elasticity is increased by reducing the temperature, which, in turn, can reduce the fibre instability. The theoretical model provides useful results for evaluating the effective longitudinal viscosity of the composite sheet, the effects of forming speed and punch geometry on the bending stresses and also highlights the limitations of a Newtonian fluid model in comparison with the actual material response.</p></div>","PeriodicalId":100299,"journal":{"name":"Composites Manufacturing","volume":"6 3","pages":"Pages 177-187"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-7143(95)95009-N","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87449363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 51

Woven fabric composites 机织复合材料

Composites Manufacturing Pub Date : 1995-01-01 DOI: 10.1016/0956-7143(95)90005-5

Alan Newton

引用次数: 0

Method of manufacturing fibre gypsum board 纤维石膏板的制造方法

Composites Manufacturing Pub Date : 1995-01-01 DOI: 10.1016/0956-7143(95)99657-E

引用次数: 0

Extrusion of tubes of fibre-reinforced thermoplastics 纤维增强热塑性塑料管的挤压

Composites Manufacturing Pub Date : 1995-01-01 DOI: 10.1016/0956-7143(95)90012-8

引用次数: 0

Effect of radial stress relaxation on fibre stress in filament winding of thick composites 厚复合材料绕丝过程中径向应力松弛对纤维应力的影响

Composites Manufacturing Pub Date : 1995-01-01 DOI: 10.1016/0956-7143(95)99646-A

Evan A. Kempner, H.Thomas Hahn

{"title":"Effect of radial stress relaxation on fibre stress in filament winding of thick composites","authors":"Evan A. Kempner, H.Thomas Hahn","doi":"10.1016/0956-7143(95)99646-A","DOIUrl":"10.1016/0956-7143(95)99646-A","url":null,"abstract":"<div><p>During filament winding of thick cylinders, fibre wrinkling often occurs which severely decreases compressive strength. To eliminate fibre wrinkling, appropriate processing conditions must be found. Fibre migration and stress relaxation due to resin flow are generally considered the most important factors affecting fibre buckling. Therefore, the effect of stress relaxation on fibre wrinkling during the filament winding process was investigated. To study the stress development during filament winding of thick cylinders, experiments were carried out using graphite/epoxy prepreg tows as well as dry graphite fibre. Cylinders of approximately 12 mm thickness were hoop wound on a 50.8 mm diameter aluminium mandrel. Winding tensions ranged from 13 to 34 N and winding speed was constant. A foil-type pressure sensor was applied on the mandrel to monitor the interface pressure throughout winding and storage of the cylinder. Significant stress relaxation was found to occur during winding with prepreg tow. Mandrel pressure increased over the winding of the first eight layers or so. However, between the winding of one layer and the next, mandrel pressure dropped quickly. Also, it began to decrease after reaching a maximum value. A stress relaxation analysis was carried out to determine the stress in the cylinders during winding. Several parameters were not known a priori and had to be inferred from the data. Stress distributions following winding were calculated for each case. The radial stress in prepreg wound cylinders was found to relax nearly to zero in the inner part of the tubes. Compressive circumferential stresses occurred throughout each of the cylinders. However, they reached greater magnitudes in the dry wound cylinders due to very low radial moduli. No fibre wrinkling was evident in any of the wound cylinders.</p></div>","PeriodicalId":100299,"journal":{"name":"Composites Manufacturing","volume":"6 2","pages":"Pages 67-77"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-7143(95)99646-A","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89223403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 18

Thermoplastic filament winding—an experimental investigation of the on-line consolidation of poly(ether imide) fit preforms 热塑性长丝缠绕——聚醚亚胺配合预制体在线固结的实验研究

Composites Manufacturing Pub Date : 1995-01-01 DOI: 10.1016/0956-7143(95)95013-O

J. Romagna, G. Ziegmann, M. Flemming

{"title":"Thermoplastic filament winding—an experimental investigation of the on-line consolidation of poly(ether imide) fit preforms","authors":"J. Romagna, G. Ziegmann, M. Flemming","doi":"10.1016/0956-7143(95)95013-O","DOIUrl":"10.1016/0956-7143(95)95013-O","url":null,"abstract":"<div><p>The development of industrial-scale manufacturing techniques for thermoplastic composites requires new processing technologies. The filament winding of thermoplastic preforms, such as powder-impregnated or intermingled yarns, would be more economical than winding of thermosets, if similar fibre placement speeds could be achieved for similar costs of equipment and preforms. The present experimental work compares two different processing techniques based on hot air and short wave infra-red spot heating, and discusses the influence of preheating the preforms and mandrel. The research work is based on powder-impregnated poly(ether imide) preforms, which are processed to hoop wound tube specimens. These preforms were commercialized under the trade name FIT (Fibres Impregnated with Thermoplastic) in the early 1980s. Characterization of the laminate quality is based on micrographs. The results show the importance of continuous heating at low heating rate. Discontinuous temperature peaks above the matrix melting temperature lead to its thermal degradation and therefore to poor laminate quality.</p></div>","PeriodicalId":100299,"journal":{"name":"Composites Manufacturing","volume":"6 3","pages":"Pages 205-210"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-7143(95)95013-O","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83307404","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

SiC coating on carbon fibres by a solution coating process 碳化硅溶液涂层法在碳纤维上的应用

Composites Manufacturing Pub Date : 1995-01-01 DOI: 10.1016/0956-7143(95)99650-H

Yu-Qing Wang , Zuo-Ming Wang , Jun-Ying Yang , Feng-Qiu Zhang , Ben-Lian Zhou

引用次数: 11