Effect of Vibrations on Void Content in Composite Materials

2008 ◽  
Vol 32 ◽  
pp. 145-148 ◽  
Author(s):  
Jelena Muric-Nesic ◽  
Z. Stachurski ◽  
Paul Compston ◽  
N. Noble
Keyword(s):  
Composite Materials ◽  
Composite Laminates ◽  
Vinyl Ester ◽  
Sandwich Composite ◽  
Void Content ◽  
Vinyl Ester Resin ◽  
Mechanical Vibrations ◽  
Sandwich Composite Structure ◽  
Poor Adhesion

Eliminating common defects such as voids, bubbles and poor adhesion at interfaces will increase the quality of laminated sandwich composite structure. We are experimenting and analyzing the effect of mechanical vibrations applied to the curing system of composite materials production, particularly on minimizing void content. The range of frequency of vibrations covered was from 2Hz to 8kHz, for different period of vibrations. The composite laminates were made by hand lay-up using glass fibres and vinyl-ester resin, and examined under a microscope to determine types and quantity of defects. The results showed reduction in the number of bubbles (as well as in void content) at frequencies between 10Hz and 50Hz for 30 minutes of vibrations.

Performance analysis of waste silk fabric-reinforced vinyl ester resin laminates

2011 ◽  
Vol 45 (23) ◽  
pp. 2475-2480 ◽  
Author(s):  
Shetty Ravindra Rama ◽  
S.K. Rai
Keyword(s):  
Composite Laminates ◽  
Vinyl Ester ◽  
Chemical Resistance ◽  
Standard Procedure ◽  
Weight Fraction ◽  
Void Content ◽  
Silk Fabric ◽  
Vinyl Ester Resin ◽  
Silk Fabrics ◽  
Made In

Laminates of vinyl ester resin system with different weight fractions of waste silk fabrics ‘as reinforcement’ are developed and their physico-mechanical properties are studied, using standard procedure. Both, tensile strength and modulus of laminates were found to increase with the increase in weight fraction of silk fabric loading. Properties such as density, void content, hardness, and water absorption of the developed composite laminates are studied. Chemical resistance test is also carried out. Attempts to explain these differing trends are made in this study by analyzing the features observed on the cross-section of tensile fractured specimen using fractography employing scanning electron microscopy.

Tensile Property Evaluation of Carbon Fiber Reinforced Aluminium Sandwich Composites

2014 ◽  
Vol 984-985 ◽  
pp. 345-349 ◽  
Author(s):  
U. Tamilarasan ◽  
L. Karunamoorthy ◽  
K. Palanikumar
Keyword(s):  
Electron Microscope ◽  
Composite Materials ◽  
Tensile Property ◽  
Composite Laminates ◽  
Sandwich Composite ◽  
Property Evaluation ◽  
New Applications ◽  
Fractured Surface ◽  
Scanning Electron ◽  
Better Than

Composite materials are finding new applications in many situations and are better than the conventional materials because of their excellent properties. In the present investigation, aluminium sandwich composite laminates are fabricated and their tensile property is evaluated. The structure of the composites and their fractured surface are studied by using Scanning Electron Microscope. The analysis of the experimental results indicated that the incorporation of aluminium stack as sandwich improves the properties and can be used as a structural material for construction.

Applying Magnetic Consolidation Pressure During Cure to Improve Laminate Quality: A Comparative Analysis of Wet Lay-Up and Vacuum Assisted Resin Transfer Molding Processes

2017 ◽  
Author(s):  
Maya Pishvar ◽  
Mehrad Amirkhosravi ◽  
M. Cengiz Altan
Keyword(s):  
Composite Laminates ◽  
Permanent Magnets ◽  
Volume Fraction ◽  
Resin Transfer Molding ◽  
Void Content ◽  
Fiber Volume ◽  
Transfer Molding ◽  
Consolidation Pressure ◽  
A New Technique

This paper presents the application of a new technique, Magnet Assisted Composite Manufacturing (MACM), to enhance the quality of composite laminates fabricated by wet lay-up/vacuum bag (WLVB) and vacuum assisted resin transfer molding (VARTM). Towards this goal, a set of high-power, Neodymium permanent magnets, which are placed on a magnetic tool plate, is applied on the vacuum bag/lay-up. To further demonstrate the effectiveness of MACM, six-ply random mat, E-glass/epoxy composite laminates are produced under four processing scenarios: (i) Conventional WLVB; (ii) WLVB with magnetic consolidation; (iii) Conventional VARTM; and (iv) VARTM with magnetic consolidation. Applying magnetic consolidation pressure is found to be a convenient and efficient method for enhancing the overall quality of the laminates fabricated by WLVB and VARTM. For instance, in WLVB-MACM process, fiber volume fraction improves by 98% to 49% and void content reduces from 5% to less than 1.5% compared to conventional WLVB. These two factors lead to substantially increased mechanical properties of the WLVB-MACM laminates to a level comparable to those achieved by the higher-cost VARTM-MACM process.

VARTM Process Improvement for Repeatable and Improved Mechanical Properties of Composite Laminates

2009 ◽  
Author(s):  
Sanjay Sharma ◽  
Dennis A. Siginer
Keyword(s):  
Mechanical Properties ◽  
Process Parameters ◽  
Composite Laminates ◽  
Volume Fraction ◽  
Void Content ◽  
Molding Process ◽  
Fiber Volume ◽  
The Impact ◽  
Vartm Process

Quality of laminates produced by Seeman Composite Resin Infusion Molding Process (SCRIMP) is studied by comparing their Fiber Volume fraction and void content. SCRIMP is a variant of Vacuum Assisted Resin Transfer Molding (VARTM). Manufacturing process parameters are then identified and varied to study the impact on mechanical properties of laminated composites. Modification to SCRIMP is carried out by infusing the resin under additional pressure. Optimal process parameters for this modified SCRIMP process are suggested to yield laminates that are repeatable and consistent in quality. Void content is reduced in the composite laminates by altering the vacuum pressure level. Thickness gradient commonly found in SCRIMP processed laminates is eliminated by allowing longer de-bulking time. Final laminate quality is measured using ASTM standardized mechanical testing.

Conceptual imposings of quality management of system of production of composite materials for it is rocket the space equipment

2017 ◽  
Vol 14 (4) ◽  
pp. 30-38
Author(s):  
V. G. Isaev ◽  
T. N. Antipova
Keyword(s):  
Composite Materials ◽  
Quality Management ◽  
Evaluation Criteria ◽  
Criteria And Indicators ◽  
Properties Of Materials ◽  
A Priority ◽  
Required Quality

Basic provisions of the concept and methodology of production of composite materials for the missile and space equipment are offered. The system of the purposes realizing the principle of a priority of the purposes of the customer is offered. The system of evaluation criteria and indicators of quality of composite materials the realizing interrelation of requirements of the customer to quality of material and dependence of ensuring the required quality on the used technologies is developed. It is shown that for ensuring quality of composite materials for units and the RKT systems first of all it is necessary development of mathematical dependences of properties of materials on parameters of the technological modes in the conditions of obligatory implementation of requirements of the customer.

scholarly journals Property Analysis of Carbon Fiber with Vinyl Ester Resin Type Sizing Agen

2013 ◽  
Vol 25 (14) ◽  
pp. 7955-7958 ◽  
Author(s):  
Wanwan Ding ◽  
Juan Chen ◽  
Jianye Liu ◽  
Zengkai Pang ◽  
Ruifang Guan
Keyword(s):  
Carbon Fiber ◽  
Vinyl Ester ◽  
Vinyl Ester Resin ◽  
Property Analysis

Cure and Dynamic-Mechanical Behaviors of Vinyl Ester Resinfilled with Multi-Walled Carbon Nanotubes

2010 ◽  
Vol 150-151 ◽  
pp. 1413-1416 ◽  
Author(s):  
Hong Yan Chen ◽  
Zhen Xing Kong ◽  
Ji Hui Wang
Keyword(s):  
Carbon Nanotubes ◽  
Vinyl Ester ◽  
Mechanical Response ◽  
Cure Kinetics ◽  
Crosslinking Density ◽  
Vinyl Ester Resin ◽  
Scanning Calorimetry ◽  
Dynamic Mechanical ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

The cure kinetics of Derakane 411-350, a kind of vinyl ester resin, and its suspensions containing multi-walled carbon nanotubes( MWCNTs) were investigated via non-isothermal dynamic scanning calorimetry (DSC) measurements. The results showed that incorporation of MWCNTs into vinyl ester resin excessively reduces polymerization degree and crosslinking density of vinyl ester resin. For suppressing the negative effect caused by nanotubes, the higher temperature initiator combined with the initiator MEKP was used. Dynamic-mechanical Behavior testing was then carried out on the cured sample in order to relate the curing behavior of MWCNTs modified resin suspensions to mechanical response of their resulting nanocomposites. It was revealed that nanocomposites containing MWCNTs possessed larger storage modulus values as well as higher glass transition temperatures (Tg) as compared to those without MWCNTs after using mixed intiators system to improve the degree of cure.

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