A New production methodology for vacuum infusion process of advanced composite structures

Download
2017
Poorzeinolabedin, Mohsen
Vacuum Infusion Process (VIP) is one of the Liquid Composite Molding (LCM) methods which are widely used in out-of-autoclave processes especially for the manufacturing of large scale composite parts in aerospace, automotive, wind energy and marine industries. In order to simulate the infusion process, the permeability of preforms is an essential parameter. Absence of any standard is a challenge for the determination of in-plane permeabilities of a preform. The first objective of this study is to develop an approach to estimate the principle permeability from a single rectilinear infusion. The presented method for permeability measurement is able to obtain preform permeability in three different directions, simultaneously and allows the calculation of the principle permeability. The repeatability of results and unusual resin filling patterns are the main challenges of this approach. It is due to the heterogeneous nature of fabrics, nesting the layers during the molding and the process over-dependency on the labor skill. Although, the simulation of the process can overcome some of the process challenges to some extent, it may not be helpful for the undesirable filling scenarios. Therefore, a real-time resin flow control may guarantee a near-perfect filling process. Another objective of this study is the resin flow control in real time. The specific resin flow control approach named here as Electromagnetically Induced Preform Resting (EIPR) introduces a new creative upper flexible mold for resting the preform to increase the permeability of preforms locally in a real time manner. This process is demonstrated experimentally and numerically. The results show the reliability and efficiency of the presented method.

Suggestions

INVESTIGATION OF INTERSONIC FRACTURE IN HIGLY CURVED COMPOSITE LAMINATES UNDER QUASI-STATIC LOADING
Gozluklu, B.; Uyar, I; Çöker, Demirkan (2014-07-25)
In wind energy and aerospace industries, new advances in composite manufacturing technology enable to produce primary load carrying elements as composite materials in wide variety of shapes large such as an L-shape. However, due to the geometry, Interlaminar Normal Stresses (ILNS) are induced once a moderately thick laminate takes highly curved shape. In the curved part of the L-shaped structure, the development of ILNS promotes mode-I type of delamination propagation which is the weakest fracture mode. Thi...
The use of polyethylene copolymers as compatibilizers in carbon fiber reinforced high density polyethylene composites
ATABEK SAVAŞ, Lemiye; Tayfun, Umit; DOĞAN, Mehmet (2016-08-15)
In the current study, three different commercially available copolymers are used as compatibilizer in carbon fiber (CF) reinforced high density polyethylene (PE) based composites. Polyethylene grafted maleic anhydride (PE-g-MA), a random terpolymer of ethylene, acrylic ester and maleic anhydride (LOT MA) and a random copolymer of ethylene and glycidyl methacrylate (LOT-GMA) are used as compatibilizers. The compatibilizers are used at three concentrations of 1.5, 3 and 6 wt%. The type and amount of compatibi...
A composite dislocation cell model to describe strain path change effects in BCC metals
Yalçınkaya, Tuncay; Geers, M.G.D. (IOP Publishing, 2009-11-16)
Sheet metal forming processes are within the core of many modern manufacturing technologies, as applied in, e.g., automotive and packaging industries. Initially flat sheet material is forced to transform plastically into a three-dimensional shape through complex loading modes. Deviation from a proportional strain path is associated with hardening or softening of the material due to the induced plastic anisotropy resulting from the prior deformation. The main cause of these transient anisotropic effects at m...
The Effect of Thermohydrogen Process on the Mechanical Properties of the Ti-6Al-4V Alloy Produced by Selective Laser Melting
Bilgin, Guney Mert; Esen, Ziya; Dericioğlu, Arcan Fehmi (2018-10-27)
Selective laser melting (SLM) is a powder bed fusion type additive manufacturing (AM) process that allows fabrication of complex and detailed components from computer aided design (CAD) model in one single step without the need of costly tools.Ti-6Al-4V alloy is widely used in the applications where high specific strength is required particularly in aero engine discs, frames and compressors.Production of the Ti-6Al-4V alloy with a conventional methodis inadequate in manufacturing complex shaped parts used e...
The effect of B4C reinforcements on the microstructure, mechanical properties, and wear behavior of AA7075 alloy matrix produced by squeeze casting
Demir, Mehmet Emin; ÇELİK, YAHYA HIŞMAN; KILIÇKAP, EROL; Kalkanlı, Ali (2022-11-01)
Aluminum and its alloys have become the most popular materials in applications aiming to provide lightness due to their low density. However, the low mechanical properties compared to other competitors are among the disadvantages of aluminum and its alloys. This is an important motivation factor in researching strength increasing mechanisms in aluminum and its alloys. In this study, the effects of reinforcement ratio and type on the microstructure, mechanical properties, and wear behavior of the AA7075/B4C ...
Citation Formats
M. Poorzeinolabedin, “A New production methodology for vacuum infusion process of advanced composite structures,” Ph.D. - Doctoral Program, Middle East Technical University, 2017.