The aim of this investigation was to measure the flexural and compressive strengths and the corresponding moduli of cylindrical composite specimens reinforced with woven glass fiber. Test specimens were made by light-curing urethane dimethacrylate oligomer with woven glass fiber of 0.18-mm standard thickness. Tests were conducted using four reinforcement methods and two specimen diameters. Flex...

objective: contradictory results have been reported over microleakage studies of restorative materials and methods. despite the number of publications on leakage there are few evidences comparing the different microleakage evaluation methods. the purpose of the present study was to compare the clearing technique and longitudinal sectioning in the evaluation of dye penetration along a glass fibe...

Statement of the problem. The fracture of acrylic resin dentures remains an unsolved problem. Therefore, many investigations have been performed and various approaches to strengthening acrylic resin, for example, the reinforcement of heat-cured acrylic resin using glass fibers, have been suggested over the years. But problems such as poor workability, rough surface, poor adhesion of glass fiber...

In the present study, modelling and vibration analysis of Carbon nanotubes/ fiber/ polymer composite microplates are investigated. The governing equations of the Carbon nanotubes/ fiber/ polymer composite microplates are derived based on first order shear deformation plate theory, rather than other plate theories, due to accuracy and simplicity of polynomial functions. The modified couple stres...

STATEMENT OF PROBLEM The flexure of the fiber- reinforced composites (FRC) which can be generally used instead of fixed metal- framework prostheses have been more advocated due to the enormous demands for the conservative and esthetic restoration. The flexure of the fiber should be well-fitted to its covering composite. No study has been reported the comparison of the combination of glass and p...

In this study, compressive strength and contraction of Polymer Composite Laminates made of E-Glass / Carbon bi-woven fabric reinforced in Epoxy resin matrix has been evaluated experimentally. Composite laminates were fabricated using hand lay-up technique for different ply orientations of 0,30,45,60 and stacking sequence of (00/300/450/600)2S for 2 and 3 mm laminate thickness. The laminates wer...

Preparation of E-glass/waterborne epoxy prepregs containing natural nanoclay and properties of their composites are presented. Prepregs were prepared by wetting randomly oriented, chopped glass fiber preforms with aqueous dispersion of EpiRez 3522-W-60 resin, dicyandiamide, 2-methylimidazole and natural nanoclay (Cloisite Naþ). The nanoclay content of the aqueous dispersion was adjusted to yiel...

objective: fiber-reinforced composite (frc) posts have recently become more popular for restoring endodontically treated teeth because of providing esthetics, better stress distribution and lower risk of root fracture. resistance against tensile forces dislodging the post from the root canal is a prerequisite for these posts. this study aimed to evaluate the tensile retention (strength) of intr...