in this paper, using numerical methods and test results, the behavior of reinforced concrete beams strengthened with fiber-reinforced polymers (frp) is investigated. in the numerical analysis, the concrete damaged plasticity model is used for considering the nonlinear behavior and strain softening of concrete. the abaqus finite element program is utilized for the analysis of 12 flexural beams s...

In this paper, ultrasonic wave propagation in three phases (3P) of composite materials was investigated. The simulation was conducted by PZFlex analysis code, a time domain finite element program. The reflection and transmission characteristics with different shapes of middle layer between glass fiber and epoxy resin are investigated in order to understand basic ultrasonic behavior of energy di...

Reinforced polymers have recently gained interest because of their high stiffness associated with the classical features and cost-effectiveness polymers. A further characteristic, suitable for several applications, is possibility to provide frictional wear resistance. The response commercially available reinforced materials was here investigated in a wide range contact boundary conditions. Expe...

This paper proposes a small sized, low-cost multiband monopole antenna which can cover the WiMAX bands and C-band. The proposed antenna of 20 × 20 mm(2) radiating patch is printed on cost effective 1.6 mm thick fiberglass polymer resin dielectric material substrate and fed by 4 mm long microstrip line. The finite element method based, full wave electromagnetic simulator HFSS is efficiently util...

Strengthening of existing circular reinforced concrete columns by CFRP confinement

Building energy models usually employ a constant, room-temperature-measured value for the thermal resistance of fiberglass roof insulation. In summer, however, the mean temperature of roof insulation can rise significantly above room temperature, lowering the insulation’s thermal resistance by 10% to 20%. Though the temperature dependence of the thermal resistance of porous materials like fiber...

The multi-scale finite element method is used to study the vibrational characteristics of polymer matrix reinforced by single-walled silicon carbide nanotubes. For this purpose, the nanoscale finite element method is employed to simulate the nanotubes at the nanoscale. While, the polymer is considered as a continuum at the larger scale. The polymer nanotube interphase is simulated by spring ele...

The design features and scientific equipment are considered for modern foreign small-sized catamaran vessels, which were put into operation in 2015-2023. Two groups of catamarans distinguished – those made reinforced fiberglass (also referred to as composite) built with aluminum alloys resistant the effects marine environment. Information is analyzed on 15 vessels a maximum length from 12 20 m,...

A fabric, tapes, that are glued to the outer tensile surface, which considered as external composite reinforcement with steel reinforcement, currently used strengthen reinforced concrete beams. The results of experimental studies presented in this article have shown possibilities effective application technical polyamide (nylon) fabric produced by «Khimvolokno Plant» JSC «Grodno Azot», and glas...

In this review paper, recent developments in the Fused Filament Fabrication (FFF) approach are provided for composite materials. Influencing parameters FFF process such as road width, print speed, layer thickness, feed rate and build temperature of model (both liquefier envelope temperature), fiber orientation, position, volume fraction, infill orientation have been studied. These considered st...