The adhesives used for applications in marine environments are subject to particular chemical conditions, which mainly characterised by an elevated chlorine ion content and intermittent wetting/drying cycles, among others. These conditions can limit the use of due degradation processes that they experience. In this work, two different polymers, polyurethane vinylester, was studied natural seawater under immersion periods time. diffusion coefficients concentration profiles water throughout...

Abstract Fast green (FG), fuchsin basic (FB) and acid (FA) were studied as copper corrosion inhibitors in citric solution. Five concentrations tested from 0.001 to 1.0 M. Twelve FG, FB FA 1 × 10 −5 −1 M, at four temperatures 298 328 K. The gravimetric method was employed study the protective effect of FA. order inhibition efficiency > FG. Conventional adsorption isotherms fit experimental data. best obtained using Frumkin isotherm model. A thermodynamic/kinetic model also fitted....

Molecular simulation is becoming a very powerful tool for studying dynamic phenomena in materials. The yields information about interaction at length and time scales unattainable by experimental measurements unpredictable continuum theories. This especially meaningful when referring to bonding between polymer metal substrate. A important characteristic of polymers that their physical properties do not rely on the detailed chemical structure molecular chains but only flexibility, accordingly...

Abstract The corrosion inhibition of copper in 0.001 M to 1.0 citric acid (C6H8O7) solution by benzotriazole (BTA, C6H5N3) has been investigated using gravimetric measurements. BTA was tested ...

This paper proposes a methodology that employs an experimental apparatus reproduces, in pre-impregnated and cured out-of-autoclave Glass Fiber Reinforced Polymer (GFRP) panels, the phenomenon of slamming or impact on bottom high-speed boat during planing. The pressure limits simulation are defined by employing finite element model (FEM) evaluates forces applied cam hits panels via microdeformations obtained simulation. requires various series be performed at different energies evolution...

Abstract Fuchsin basic (FB) and fuchsin acid (FA) were tested as new corrosion inhibitors for copper in 0.001, 0.005, 0.01 M hydrochloric (HCl) solutions. Benzotriazole (BTA) was also comparative purposes. Twelve FB, FA, BTA concentrations, from 1 × 10−5 to 10−1 M, added the solution at four temperatures ranging 298 K 328 K. Gravimetric measurements performed after 3 h experimentation. The order of inhibition efficiency FB ∼ > FA. Frumkin isotherm gave best fit experimental results....

ABSTRACT Fibre–metal hybrid laminates combine layers of metal with made composites – polymeric matrix reinforced glass‐fibre woven fabric. Interface behaviour plays a fundamental role in the overall properties material, especially failure mode by debonding buckling outermost layer. A proper measurement adhesive fracture energy is required so as to avoid this early mechanism during bending. Tapered double cantilever beam test and dissimilar mixed‐mode bending have been used obtaining I II...

In the Galapagos Islands there is an important fleet of coastal shipping vessels for navigation between islands, less than 15 meters in length and constructed fiberglass reinforced plastic (GFRP). The proposal to modify hulls new ships that enter operate islands with viscoelastic sheets presented. order protect them from damage caused by phenomenon slamming increase their life time. By means fatigue tests applying cyclic loading, evolution within laminate observed, characterization...

Planing hull vessel built with polymer matrix laminates and fiberglass reinforcements (GFRP) suffer structural damage due to the phenomenon of slamming during navigation, impact boat on free surface water at high speed. A modification in manufacture for these fast boats is proposed, consisting insertion an additional layer a hybrid material, formed by elastomer encapsulated ABS cell. Using GFRP specimens made from pre-impregnated material reproducing characteristic impacts slamming, it...

The adsorption of Fuchsin Basic (FB) on copper surfaces in citric acid solutions whose concentrations ranged from 0.001 to 0.1 M was investigated using gravimetric measurements. FB studied 1 × 10 −5 −1 with experiments being conducted at temperatures 298 K 328 K. mechanism is discussed terms the applicability conventional Frumkin, Bockris–Swinkels and Kastening–Holleck isotherms, amongst others. best fit obtained Frumkin isotherm model. A thermodynamic/kinetic model also fitted.

Para el diseño de embarcaciones construidas por laminados GFRP se propone una inserción con capa viscoelástica para disminuir la propagación del daño producido impacto vertical fondo nave mar o fenómeno slamming. Mediante comparaciones impactos verticales caída peso que reproducen energía inferida al panel durante navegación, estudia paneles preimpregnado curados OoA comparándolo modificados viscoelástica. El empleo lectura datos aceleraciones permite cuantificar mediante...

For the design of vessels built by GFRP laminates, an insert with a viscoelastic layer is proposed to reduce spread damage produced vertical impact ship's bottom sea or slamming phenomenon. Using drops-weight machine that reproduce energy inferred panel during navigation, propagation OoA cured prepreg panels studied comparing it modified insertion layer. The use acceleration data reading allows benefits modification be quantified through developed formulation. force, displacement and...

Water hammer imposes a steep rise in pipe pressure due to the rapid closure of valve or pump shutdown. Transversal strain waves propagate along wall at sonic velocities, and dynamic stresses are developed material, which can interact with discontinuities contribute an unexpected failure. Pressure increase has been modeled as simple step front finite element model short section steel pipe. Boundary conditions have considered closely resemble longer behavior. The shock traveling length...

Currently, the procurement of lightweight, tough, and impact resistant materials is garnering significant industrial interest. New hybrid can be developed on basis numerous naturally found with gradient properties in nature. However, previous studies granular demonstrate possibility capturing energy generated by an within material itself, thus deconstructing initial impulse into a series weaker impulses, dissipating through various mechanisms, gradually releasing undissipated energy. This...