The objective of the present work is to evaluate wind potential in nearshore Mediterranean Sea. Thus, a comprehensive picture conditions provided by considering 15-year cumulative information coming from remotely sensed data and two numerical models. These are European Center for Medium-Range Weather Forecasts (ECMWF) National Centers Environmental Prediction (NCEP). Since most offshore turbines usually operate at about 80 m height, initial (reported 10 m) were adjusted this height various...

In this study, the composition and mechanical properties of composites designed for shipbuilding are described. Four different were fabricated by research team, using quadriaxial glass fiber fabric (eight layers in all composites), two resins (the epoxy resin SikaBiresin® CR82 with hardener CH80-2 or polyester Enydyne H 68372 TA Metox-50 W as accelerator), a middle layer Coremat Xi 3 (only applied some composites). The experimental results low-velocity impact tests also discussed, including...

This paper presents research on several factors influencing the stabbing behaviour of stratified panels made aramid fabric Twaron® SRM509 Teijin Aramid BV (Arnhem, The Netherlands). inputs in test campaign were number layers, impact energy, and sample size. Tests performed small samples (130 mm × 130 mm) an Instron® CEAST 9350 drop-tower system (Norwood, MA, USA) larger (400 400 using a installation with same values energy. Knife type S1 was used, geometry recommended NIJ Standard 0115.00...

This paper presents the behavior of composite panels based on glass fiber unidirectional fabrics and a bi-component epoxy resin under ballistic impacts that characterize two threat levels: FB2 FB3, according to EN 1523:2004. The tested had characteristics kept in narrow ranges: thickness 18.26 ± 0.22 mm, mass ratio fabrics/panel 0.788 0.015, surface density 27.51 0.26 kg/m2. After testing panels, failure mechanisms panel were evidenced by scanning electron microscopy photographs. Here...

This paper presents experimental results from three-point bending tests for a composite made of quadriaxial glass fiber fabrics and an epoxy resin. Two composites were tested, one with 8 layers the other 16 layers; both had same matrix (the resin). Tests carried out, using five different test rates 10 mm/min to 1000 mm/min. The following parameters recorded calculated: Young’s modulus, flexural stress, strain, energy, force, all four first peak. data reveal no sensitivity these materials...

Injection of solid tritium pellets is considered to be the most promising way fueling fusion reactors. The Tritium Proof-of-Principle experiment has demonstrated feasibility forming and accelerating pellets. This injector based on pneumatic pipe-gun concept, in which are formed situ barrel accelerated with high-pressure gas. ideal for service because there no moving parts inside gun excess required pellet production process. Removal 3He from prevent blocking cryopumping action by...

Polybutylene terephthalate (PBT) and its aramid fiber composite (10 wt.%) were investigated in order to measure their wear frictional properties under variations of applied load (5 N, 10 15N) velocity (0.25 m/s, 0.5 m/s 0.75 m/s), dry regime.The tribological the evaluated using a block-on-ring tribotester.The worn surface was with scanning electronic microscope authors pointed out particular processes taking place into superficial layers friction couple.During tests, temperature measured by...

Purpose – This research aims to characterize the tribological behavior of polybutylene terephthalate (PBT) and PBT composites with micro glass beads (MGB) on steel, in dry conditions a block-on-ring tester, pointing out influence sliding distance speed. The tribology its is still an early stage because this thermoplastic polyester requires accurate technological thermal treatment. Design/methodology/approach were produced by ICEFS Savinesti Romania contain grade Crastin6130NC010 (as supplied...

This paper presents the influence of TiO2 as additive in refined rapeseed oil different massic concentration (0.25%wt, 0.50%wt and 1%wt) on tribological parameters. Tests are done a four-ball machine from laboratory LubriTest, at "Dunarea de Jos" University Galati. The test parameters were load: 100 N, 200 N 300 rotational speed 1000 rpm, 1400 rpm 1800 rpm. Particles have an average size 21°5 nm. was supplied by Prutul For tested ranges parameters, additivation with do not improve friction...

Purpose – The paper aims to present results on the friction and wear of polytetrafluoroethylene (PTFE) eight commercially available composites with PTFE matrix, for tests done shoe/roller tribotester water lubrication in open circuit. There are pointed out particular tribological processes within superficial layers help optical microscopy. Design/methodology/approach Analysing behaviour grades sliding tribotester. Findings Good under all composites. exhibits severe tested regime....

This paper presents experimental results on the behavior of a class glass fiber composites under low velocity impacts, in order to analyze their usage designing impact-resistant components car and marine industries. Also, finite element model at meso level (considering yarn as compact, homogenous isotropic material) was run with help Ansys Explicit Dynamics point out stages failure equivalent stress distribution main yarns different layers composite. The were manufactured laboratory scale...

The paper presents the change of functional parameters defined on Abbott-Firestone curve in order to evaluate surface quality balls from four ball tester, after tests done with several vegetable oils. were using two grades rapeseed oil (degummed and refined) soybean (coarse degummed) a common transmission (T90). Test 200 N 0.576 m/s (1500 rpm) for 60 minutes. For refined oil, changes shape curves are more dramatic, these being characterized by high values Spk (the average value wear scars...

Abstract This paper presents a review on issues additivating vegetal oils with friction and anti-wear modifiers. A SWOT analysis reveals the shortcomings of these trend in their modification by help additives. Based research reports available from literature experimental work, authors formulated synthesis how wear modifiers act lubricants especially oils. They discussed influence some added oils, soybean oil rapeseed oil. The conclusion is that additivation still at beginning as reported...

Abstract This paper presents results of testing the coarse rapeseed oil additivated with different concentrations ZnO (0.25%wt, 0.50%wt and 1%wt, 14±5 nm in size), on a four-ball machine. The test parameters were load main shaft machine: 100 N, 200 N 300 rotational speed 1000 rpm, 1400 rpm 1800 rpm. For tested range concentration, value 1%wt does not improve friction coefficient, but wear rate scar diameter was lower than that obtained neat values are less sensitive sliding for more severe...

This paper presents a macro FEM isothermal model for simulating the impact of 9 mm FMJ bullet on stratified packs in order to restrain preliminary tests actual made layers Twaron LFT SB1plus (Teijin), taking into account friction between and layers, obtain number that arrest bullet. The were considered as an orthotropic material, with maximum equivalent plastic strain 0.06. materials are modeled bilinear isotropic hardening. analyzed parameter validate was broken layers. average value back...

Abstract Even more than in other field of activities, standardization ballistic protection is trends CEN/CENELEC declaration that “standards build trust”, promoting innovation and introduction new, performant solutions based on test procedures protocols are able to point out quality safety for such systems. Ballistic testing standards have particular specifications materials, differentiation tests being made especially the purpose product. In last decades, methods been refined measurement...

Abstract This paper presents results of testing the coarse rapeseed oil additivated with 1%wt hexagonal boron nitride (hBN). Tests are done on a four-ball machine from laboratory LubriTest, at “Dunarea de Jos” University Galati. were in mild regime (recommended for applications) and severe regime. The test parameters were: load main shaft (100 N, 200 N 300 N) sliding speed 0.38 m/s, 0.53 m/s 0.69 duration 1 h. Severe run step 50 till 900 each being minute m/s. concentration hBN does not...

This paper presents results on tribological characteristics for polymer blends made of polybutylene terephthalate (PBT) and polytetrafluoroethylene (PTFE). blend is relatively new in research as PBT has restricted processability because its processing temperature near the degradation one. Tests were done block-on-ring tribotester, dry regime, variables being PTFE concentration (0%, 5%, 10% 15% wt) sliding regime parameters (load: 1, 2.5 5 N, speed: 0.25, 0.5 0.75 m/s, distance: 2500, 5000...

Ballistic experiments are fundamental for body armor new products and help to identify key factors influencing the damage processes of sophisticated materials these armors made of. Tests on packs LFT SB1 according Resistance Body Armor NIJ Standard-0101.06-2008 gave good results 24 layers this fabric backface signature (BFS - depth deformation generated in support material ballistic clay) was measured. The average value 23.11 mm recommends system protection level II IIA, above-mentioned...