Composites Manufacturing最新文献_第4页

Numerical simulation of fibre reorientation in the consolidation of a continuous fibre composite material 连续纤维复合材料固结过程中纤维取向的数值模拟

Composites Manufacturing Pub Date : 1995-01-01 DOI: 10.1016/0956-7143(95)95019-U

A.B. Wheeler, R.S. Jones

{"title":"Numerical simulation of fibre reorientation in the consolidation of a continuous fibre composite material","authors":"A.B. Wheeler, R.S. Jones","doi":"10.1016/0956-7143(95)95019-U","DOIUrl":"10.1016/0956-7143(95)95019-U","url":null,"abstract":"<div><p>When a rectangular sample of aligned, continuous fibre-reinforced composite is subjected to normal pressure, it has been observed that resin is squeezed out parallel to the fibres and the fibres flow transversely. The fibres deform so that the sample becomes barrel-shaped. A three-dimensional code has been developed to simulate this flow. The material is modelled as a transversely isotropic continuum in which the fibre direction is specified at each point by a vector a. The system of coupled equations is solved using a finite difference technique. The transverse and longitudinal viscosities are assumed to be functions of the fibre volume fraction which increases as the resin is forced to percolate parallel to the fibres. The stress equations of motion are discretized using central differences for a fixed orientation and the discretized equations are solved using a pseudo-time technique. The converged solution is then used to determine the change in fibre direction at each point of the continuum. The process is repeated in real time using the new fibre orientation. In the momentum equations, the viscous terms are treated explicitly and the pressure gradient implicitly. A projection method is used to ensure that the mass is conserved at each time step. The results are in broad agreement with the experimental observations and demonstrate the success of the continuum model to predict flow behaviour.</p></div>","PeriodicalId":100299,"journal":{"name":"Composites Manufacturing","volume":"6 3","pages":"Pages 263-268"},"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)95019-U","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85218513","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

Rheological model for the forming of fabric-reinforced thermoplastic sheets 织物增强热塑性薄板成形的流变学模型。

Composites Manufacturing Pub Date : 1995-01-01 DOI: 10.1016/0956-7143(95)95006-K

A.F. Johnson

引用次数: 34

Method of making multi-walled pipes and storage tanks for toxic and corrosive fluids 有毒和腐蚀性液体多壁管道和储罐的制造方法

Composites Manufacturing Pub Date : 1995-01-01 DOI: 10.1016/0956-7143(95)90014-4

引用次数: 0

Effect of preform shape on buckling of quasi-isotropic thermoplastic composite laminates during sheet forming 预成形件形状对准各向同性热塑性复合材料层合板成形屈曲的影响

Composites Manufacturing Pub Date : 1995-01-01 DOI: 10.1016/0956-7143(95)95020-Y

G.B. McGuinness, C.M. ÓBrádaigh

{"title":"Effect of preform shape on buckling of quasi-isotropic thermoplastic composite laminates during sheet forming","authors":"G.B. McGuinness, C.M. ÓBrádaigh","doi":"10.1016/0956-7143(95)95020-Y","DOIUrl":"10.1016/0956-7143(95)95020-Y","url":null,"abstract":"<div><p>An important issue in sheet forming of continuous fibre-reinforced thermoplastic composites is the tendency of the laminates to buckle out of plane under rapid forming conditions. This paper outlines a method used to predict the stress patterns responsible for buckling, and presents experimental results that correspond with the predictions. A finite element formulation for ideal fibre-reinforced Newtonian fluids, featuring the twin kinematic constraints of material incompressibility and fibre inextensibility, is used. A mixed penalty finite element approach is adopted, with independent interpolation of tension and velocity solution fields. An analysis model consistent with an assumption of plane stress is used. For multi-ply lay-ups, each ply is analysed individually, and average stress predictions for the laminate are obtained on this basis. A detailed comparison between numerical stress predictions and experimental buckling patterns is presented for central indentation of circular unidirectional, cross-ply and quasi-isotropic preforms. Parameters influencing the magnitude and location of peak tangential stresses include tangential fibre lengths and diaphragm/composite viscosity ratios. The effect of sheet width and shape on the instability patterns is investigated for quasi-isotropic laminates of different shapes, using both numerical and experimental techniques.</p></div>","PeriodicalId":100299,"journal":{"name":"Composites Manufacturing","volume":"6 3","pages":"Pages 269-280"},"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)95020-Y","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73220273","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

Optimization of filament-wound parts based on non-geodesic winding 基于非测地线绕组的丝绕件优化设计

Composites Manufacturing Pub Date : 1995-01-01 DOI: 10.1016/0956-7143(95)99647-B

J. De Carvalho, M. Lossie, D. Vandepitte, H. Van Brussel

引用次数: 59

Bonding of thermoplastic composite structures to metal structures 热塑性复合材料结构与金属结构的粘合

Composites Manufacturing Pub Date : 1995-01-01 DOI: 10.1016/0956-7143(95)99660-K

引用次数: 0

Optimization of the diaphragm forming process for continuous fibre-reinforced advanced thermoplastic composites 连续纤维增强高级热塑性复合材料膜片成形工艺的优化

Composites Manufacturing Pub Date : 1995-01-01 DOI: 10.1016/0956-7143(95)95004-I

S. Delaloye, M. Niedermeier

引用次数: 24

Nonlinear phenomena in flows of viscoelastic polymer fluids 粘弹性聚合物流体流动中的非线性现象

Composites Manufacturing Pub Date : 1995-01-01 DOI: 10.1016/0956-7143(95)90024-1

K. Friedrich Prof. Dr Int., M.Q. Zhang Dr

引用次数: 0

Investigation of the effects of varying the processing parameters in diaphragm forming of advanced thermoplastic composite laminates 不同工艺参数对高级热塑性复合材料层合板膜片成形影响的研究

Composites Manufacturing Pub Date : 1995-01-01 DOI: 10.1016/0956-7143(95)95005-J

Michael A. Keane, Margaret B. Mulhern, Patrick J. Mallon

{"title":"Investigation of the effects of varying the processing parameters in diaphragm forming of advanced thermoplastic composite laminates","authors":"Michael A. Keane, Margaret B. Mulhern, Patrick J. Mallon","doi":"10.1016/0956-7143(95)95005-J","DOIUrl":"10.1016/0956-7143(95)95005-J","url":null,"abstract":"<div><p>Diaphragm forming offers several advantages over other forming techniques in the manufacture of advanced thermoplastic composites. The technique can be used in the forming of parts with complex curvature and can produce excellent surface finish. This work investigates the effect of buckling in both single- and double-curvature moulds, while forming carbon fibre-reinforced poly(ether ether ketone) (APC-2). A control system was set up to provide linear displacement of parts at rates of 1–100 mm min<sup>−1</sup>. Buckling was established for both cross-ply and quasi-isotropic lay-ups in a double-curvature elliptical dish mould. Forming rate experiments were also carried out on a single-curvature 90° mould, with no buckling occurring at forming rates up to 100 mm min<sup>−1</sup> The conditions likely to cause buckling were calculated for the 90° female mould, using both the tensile properties of the diaphragm material and interply shear data for APC-2 laminates. An investigation was also made into the spring-forward effect on 90° parts formed using male and female tools for both APC-2 and carbon fibre-reinforced poly(ether imide) materials. The parts made from the male tool using these materials had a larger spring-forward effect in each case. The influence of part thickness was investigated and found to reduce the spring forward which occurred. The effect of mould radius of curvature was also investigated and found to be negligible. The effect on part quality when varying the consolidation pressure was investigated for [0°/90°]<sub>2S</sub> and [0°/±45°/90°]<sub>S</sub> APC-2 lay-ups in the male 90° mould. The parts were ultrasonically C-scanned to assess their quality; interlaminar shear tests were also carried out to validate the ultrasonic tests. It was found that a consolidation pressure in excess of 200 kPa was required to fully consolidate these parts.</p></div>","PeriodicalId":100299,"journal":{"name":"Composites Manufacturing","volume":"6 3","pages":"Pages 145-152"},"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)95005-J","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88515226","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: 13

Pipe joining construction of a bicycle frame 自行车车架的管道连接结构

Composites Manufacturing Pub Date : 1995-01-01 DOI: 10.1016/0956-7143(95)99653-A

引用次数: 0