Cure-dependent thermomechanical modelling of the stress relaxation behaviour of composite materials during manufacturing

2016 ◽  
Vol 51 (7) ◽  
pp. 877-898 ◽  
Author(s):  
Christian Brauner ◽  
Tim Frerich ◽  
Axel S Herrmann
Keyword(s):  
Manufacturing Process ◽  
Material Model ◽  
Fibre Volume ◽  
Process Engineering ◽  
Test Case ◽  
Relaxation Behaviour ◽  
Resin Transfer Moulding ◽  
The Matrix ◽  
Transversally Isotropic ◽  
Transfer Moulding

This study contributes to the understanding of the mechanism behind process-induced distortions and stresses related to the Resin Transfer Moulding manufacturing process. The objective is to comprehend the phenomena and to identify related parameters. During the manufacturing process, engineering constants of the matrix are changing and are influenced by the existence of a large number of effects. A viscoelastic material model has been derived. This developed material model integrates a dependency of the time–temperature–polymerisation and fibre volume content on the relaxation behaviour of residual stresses in a transversally isotropic reinforced material. The model is validated using a test case on the coupon level and results / limitations are discussed.

scholarly journals The Use of Low Pressure Compression in Resin Transfer Moulding to Enhance the Fibre Volume Fraction of Composite Materials

1999 ◽  
Vol 8 (6) ◽  
pp. 096369359900800
Author(s):  
Scott McGovern ◽  
P.-Y. Ben Jar
Keyword(s):  
Electron Microscopy ◽  
Volume Fraction ◽  
Fibre Volume Fraction ◽  
Low Pressure ◽  
Fibre Volume ◽  
Resin Transfer Moulding ◽  
Resin Injection ◽  
Glass Fibre Reinforced ◽  
Transfer Moulding ◽  
Scanning Electron

A low-pressure compression was applied after complete resin injection in the manufacture of resin transfer moulded (RTM) glass-fibre-reinforced laminates. Representative laminates were produced and their fibre volume fraction's ( Vf's) compared with that of laminates manufactured under conventional vacuum-driven RTM. The intralaminar and overall Vf's were examined from images generated through scanning electron microscopy (SEM), and each manufacturing process was compared for its ability to produce uniform high Vf composites.

Applying Computational Analysis in Studies of Resin Transfer Moulding

2012 ◽  
Vol 326-328 ◽  
pp. 158-163 ◽  
Author(s):  
F. Ferreira Luz ◽  
Sandro Campos Amico ◽  
A. de Lima Cunha ◽  
E.Santos Barbosa ◽  
Antônio Gilson Barbosa de Lima
Keyword(s):  
Porous Media ◽  
Computational Analysis ◽  
Volume Fraction ◽  
Numerical Study ◽  
Fibre Volume Fraction ◽  
Fibre Volume ◽  
Fibre Reinforcement ◽  
Resin Transfer Moulding ◽  
Advanced Composite Materials ◽  
Transfer Moulding

Resin Transfer Moulding (RTM) as it is most known process in the Resin Injections family, is an extensively studied and used processing method. This process is used to manufacture advanced composite materials made of fibres embedded in a thermoset polymer matrix. Fibre reinforcement in RTM processing of polymer composites is considered as a fibrous porous medium regarding its infiltration by the polymer resin. In this sense, the present work aims the computational analysis of a fluid in a porous media for a RTM composite moulding by using the ANSYS CFX® commercial software. In order to validate the numerical study of the fluid flow in a known RTM system, experiments was carried out in laboratory to characterize the fluid (vegetal oil) flowing into the porous media (0/90 glass fibre woven), were pressure and fibre volume fraction have been fixed. The numerical simulation provides information about volume fraction, pressure and velocity distribution of the phases (resin and air) inside the porous media. The predicted results were compared with the experimental data and its has shown a solid relationship between them.

Numerical simulations for class A surface finish in resin transfer moulding process

2012 ◽  
Vol 43 (2) ◽  
pp. 819-824 ◽  
Author(s):  
Geneviève Palardy ◽  
Pascal Hubert ◽  
Eduardo Ruiz ◽  
Mohsan Haider ◽  
Larry Lessard
Keyword(s):  
Numerical Simulations ◽  
Surface Finish ◽  
Resin Transfer Moulding ◽  
Moulding Process ◽  
Class A ◽  
Transfer Moulding

Permeability Prediction in the Impregnation Stage of Resin Transfer Moulding

2010 ◽  
Vol 160-162 ◽  
pp. 1211-1216
Author(s):  
Zhuang Liu ◽  
Xiao Qing Wu
Keyword(s):  
Stokes Equations ◽  
Approximate Model ◽  
Local Deformation ◽  
Resin Transfer Moulding ◽  
Moulding Process ◽  
2D Simulation ◽  
Macro Scale ◽  
Darcy Equations ◽  
Transfer Moulding ◽  
Meso Scale

The impregnation stage of the Resin Transfer Moulding process can be simulated by solving the Darcy equations on a mould model, with a ‘macro-scale’ finite element method. For every element, a local ‘meso-scale’ permeability must be determined, taking into account the local deformation of the textile reinforcement. This paper demonstrates that the meso-scale permeability can be computed efficiently and accurately by using meso-scale simulation tools. We discuss the speed and accuracy requirements dictated by the macro-scale simulations. We show that these requirements can be achieved for two meso-scale simulators, coupled with a geometrical textile reinforcement modeller. The first solver is based on a finite difference discretisation of the Stokes equations, the second uses an approximate model, based on a 2D simulation of the flow.

In-Mould Gel Coating for Resin Transfer Moulding

2010 ◽  
Author(s):  
J Summerscales ◽  
◽  
C Hoppins ◽  
P Anstice ◽  
N Brooks ◽  
...  
Keyword(s):  
Resin Transfer Moulding ◽  
Transfer Moulding

Thermal, structural, and mechanical effects of nanofibrillated cellulose in polylactic acid filaments for additive manufacturing

BioResources ◽  
2020 ◽  
Vol 15 (4) ◽  
pp. 7954-7964
Author(s):  
Diego Gomez-Maldonado ◽  
Maria Soledad Peresin ◽  
Christina Verdi ◽  
Guillermo Velarde ◽  
Daniel Saloni
Keyword(s):  
Tensile Strength ◽  
Additive Manufacturing ◽  
3D Printing ◽  
Polylactic Acid ◽  
Modulus Of Elasticity ◽  
Manufacturing Process ◽  
Thermal Characterization ◽  
Nanofibrillated Cellulose ◽  
Small Decrease ◽  
The Matrix

As the additive manufacturing process gains worldwide importance, the need for bio-based materials, especially for in-home polymeric use, also increases. This work aims to develop a composite of polylactic acid (PLA) and nanofibrillated cellulose (NFC) as a sustainable approach to reinforce the currently commercially available PLA. The studied materials were composites with 5 and 10% NFC that were blended and extruded. Mechanical, structural, and thermal characterization was made before its use for 3D printing. It was found that the inclusion of 10% NFC increased the modulus of elasticity in the filaments from 2.92 to 3.36 GPa. However, a small decrease in tensile strength was observed from 55.7 to 50.8 MPa, which was possibly due to the formation of NFC aggregates in the matrix. This work shows the potential of using PLA mixed with NFC for additive manufacturing.

Sign in / Sign up

Export Citation Format

Share Document