Sandwich panels are composites which consist of two thin laminate outer skins and lightweight (e.g., honeycomb) thick core structure. Owing to the structure, such distinguished by stiffness. Despite thickness core, sandwich light have a relatively high flexural strength. These spatial affects good thermal insulator properties. used in aeronautics, road vehicles, ships, civil engineering. The mechanical properties these directly dependent on components method manufacturing. paper presents...

Forecasting is one of the cognitive methods based on empirical knowledge supported by appropriate modeling that give information about way relations between factors and how phenomenon under study will develop in future. In this article, a selection made suitable architecture for predictive model set data obtained during testing properties polymer composites with matrix form epoxy resin trade name L285 (Havel Composites) H285 MGS hardener Composites), addition physical modifier noble alumina...

The aim of the study is to assess effect multi-walled carbon nanotubes (MWCNTs) on wear behavior MWCNT-doped epoxy resin. In this study, a laminating resin system designed meet standards for motor planes was modified with MWCNTs at mass fractions from 0.0 wt.% 2.0 wt.%. properties were determined in Raman spectroscopy and HR-TEM. An examination conducted linear abraser visual inspection an optical microscope SEM imaging, loss measurement, evaluation volume profilometer. Moreover, mechanical...

The revolution in the global market of composite materials is evidenced by their increasing use such segments as transport, aviation, and wind industries. innovative aspect this research methodology approach, based on simultaneous analysis mechanical tribological loads materials, which are intended for practical construction aviation parts. Simultaneously, allows composition composites used to be optimized. Therefore, presented tests show undefined properties new material, necessary...

This study discusses a quantitative fatigue evaluation of polymer–ceramic composites for dental restorations, i.e., commercial (Filtek Z550) and experimental Ex-nano (G), Ex-flow (G). Their is based on the following descriptors: mechanical strength, elastic modulus strain work to fracture. Supposed reflect factors environmental degradation conditions, thermal was simulated with special computer-controlled device performing algorithms thermocycling. The specimens intended strength test...

Comparison of operational availability publiC

In this research, an analysis of polymer composite with the matrix L285-cured hardener H286 and six reinforcement layers carbon fabric GG 280 T was provided. It involved a comparison dynamical behavior responses for three cases structures in context presence mass share modifier. The samples addition physical modifier varying percentages were investigated by being subjected to dynamic tests specific parameters, i.e., constant excitation amplitude vibration frequency vicinity base resonance...

The aim of this study was to examine the impact weathering and thermal shocks on abrasive wear epoxy resin composites reinforced with carbon fabric that are commonly used in aviation. composite exposed degradation an apparatus simulating then subjected abrasion process, without presence water. controlled by checking weight loss as well visual inspection. research findings indicated a significant effect water process friction upon deterioration resistance regard dry friction. long-term rapid...

In order to check the possibility of using powder aerogel as an additive matrix polymer ablative composite, experimental tests material strength composite well tribological properties and Shore D hardness depending on amount dispersed phase in form were carried out. perform tests, prepared samples differing percentage addition temperature cross-linking before test. Based study, it can be concluded that use deteriorated mechanical relation base (without additive). As a result adding aerogel,...

Purpose: Carbon nanotubes are used in composite materials due to the improvement of (including tribological) properties composites, especially thermoplastic matrix composites. This demonstrates potential CNTs and validity research on determining impact this type reinforcement under development. Design/methodology/approach: The article presents selected results polymer composites made C.E.S. R70 resin, H72 hardener with addition a physical friction modifier (CNTs) percentage by volume 18.16%...

Abstract Biomass waste processing with a potential to commercialization is always concern for achieving sustainable ecosystem. In the current work, biochar was extracted from arhar stalks (AS) and bael shells (BS) biowaste which has carbon as major constituent. As result, in particle form excellent mechanical tribological properties hence when combined epoxy forms composite enhanced properties. this context, composites were prepared three different compositions of 2, 4, 6% wt, characterized...

This article describes the results of tribological research into epoxy-based composites reinforced with carbon fiber. The were subjected to accelerated tests simulating a semi-annual influence environmental conditions an elevated temperature, precipitation in combination UV-A radiation 0.83 W/m 2 as well cyclic thermal shocks causing leap temperature difference 116.5°C. process friction was conducted dry and wet presence water. authors found positive two-month impact upon increasing wear...

The subject of the research is a polymer composite with matrix base epoxy resin L285 cured H285 hardener, and physical modifier friction in form alundum. article presents an analysis findings tribological examinations. authors evaluated influence properties alundum, i.e., mass share grain size, on abrasive wear composite, defined as loss weight well roughness parameters selected mechanical properties. examinations have been extended by measurements hardness density prepared composites....

In the article, authors describe analysis of impact frequency fatigue tests on temperature modified polymer. The base material for producing samples was epoxy resin Epidian 57 cured with Z1 hardener. presented study is part a research program adhesive joints made composition 57/Z1 aiming to determine effect physical modification its properties and such composition. tested compositions were by additions micro- nanoparticles in an amount 1.85 % (micro- nanoparticles) or 10 (microparticles)...

This study evaluates the effect of aging in artificial saliva and thermal shocks on microhardness bulk-fill composite compared to nanohybrid composite. Two commercial composites, Filtek Z550 (3M ESPE) (Z550) Bulk-Fill (B-F), were tested. The samples exposed (AS) for one month (control group). Then, 50% from each subjected cycling (temperature range: 5–55 °C, cycle time: 30 s, number cycles: 10,000) another put back into laboratory incubator 25 months saliva. samples’ was measured using Knoop...

The technological and operational properties of press-materials based on novolak composition modified jointly by epoxydianic resin polyvinylpyrrolidone depending upon filler nature pressing conditions have been determined.The reactivity obtained presspowders has investigated type, as well curing composites under which ammonia formaldehyde are not emitted.It shown that developed the same compared with known phenoplasts but their heat resistance, impact strength electroinsulating better.

This article explains and demonstrates how to first second injection moulding influence shrinkage effect of polypropylene composites with talcum cutting glass fiber. Results show that the longitudinal transverse changed by differend parameters moulding. It was observed compensating occurring at composite molded parts a high fiber content. Recycling process has reduced tensile strength. Caused an increase in elongation, but it not noticed any major changes hardness parts.

Abstract Five series of samples were prepared, each batch consisting 20 epoxy-resin items, CES R70 with H72 hardener and 4 types powder additives: montmorillonite (MMT), Expancell d25 Microsphere (microsphere), nanocarbon (NanoC) silicon carbide (SiC). All the additives added in quantities corresponding to 15% total volume share material. The test for tensile three-point transverse bend made accordance standards: PN-EN ISO 527-1 178. addition materials into resin affected change examined...

The paper presents the results of investigations on glass fiber reinforced composite for floor panels with quartz powder additions different percentages in terms wear resistance, friction coefficient, hardness, and strength. resistance was assessed using specific work parameter determined by novel tribotester band. It found that an increase addition to tested polymer does not enhance its mechanical increasingly properties. From tests it can be concluded only four layers fibers 6 wt.%...