Vacuum assisted resin transfer moulding (VARTM) is a promising manufacture process for making large and complex fiber reinforced composite structures. However, the complexity of the flow of the resin in the infusion stage usually leads to nonuniform property distribution of the produced composite part. In order to control the flow of the resin, the situation of flow should be mastered. For the ...

In this research, the effect of different matrix materials (epoxy and vinylester) on mechanical properties Basalt, Jute, Glass fiber-based hybrid composites were analyzed mechanically morphologically. The test results achieved by Tensile Vickers hardness test, while morphologic images obtained Scanning Electron Microscopy. Basalt fiber fabric, Jute fabrics 86 gr/m² 100 used as reinforcement ele...

Abstract The accurate characterization of fabrics used in vacuum assisted resin transfer molding (VARTM) is essential order to model the flow through these porous preforms. A wide range are available for composite manufacturing VARTM and thus brings about a need opt methodology which characterizes in-plane permeability These values can then be simulations that track front progression mold filli...

In this research work, samples of the biocomposite were manufactured using vacuum assisted resin transfer molding (VARTM) technique, whose matrix is a polyester and reinforcement biaxial fabric (90°) made with jute fiber. Then, tensile flexural tests carried out on standardized specimens under ASTM standards, in order to mechanically characterize jute-polyester biocomposite. both destructive te...

We studied the mechanism of volatile-induced surface porosity formation during the resin transfer molding (RTM) of aerospace composites using a blended benzoxazine/epoxy resin, and identified reduction strategies based on material and processing parameters. The influence of viscosity and pressure on resin volatilization were determined. Then, in situ data was collected during molding using a la...

Purpose: The purpose of the paper is to manufacture the polymer matrix composites using vacuum assisted resin infusion molding. Design/methodology/approach: Electrical heating resistances are used for heating of table. The temperature control is achieved by means of acquiring temperatures using thermocouples located beneath the table surface. VARIM table is divided into eight regions. Each regi...

A simplified approach for estimating weld lines, vent locations and fill times for resin transfer molding applications in non-planar geometry is presented. The molding parts are treated as polyhedral spaces for which the concept of Voronoi diagram and shortest paths is utilized to predict the formation of weld lines, location of vents and filling times. The approach is based purely on geometric...

OBJECTIVE To estimate the differences in immediate maternal and neonatal effects of forceps and vacuum-assisted deliveries. METHODS We conducted a medical record review of all forceps and vacuum-assisted deliveries that occurred from January 1, 1998, to August 30, 1999, at Winthrop-University Hospital. Maternal demographics and delivery characteristics were recorded. Maternal outcomes, such a...