Ablative nanocomposites were prepared by incorporating multiwall carbon nanotubes (MWCNT) into phenolic resin and then impregnating them rayon-based fabric. MWCNT blended at 0.5, 1, 2 wt% loadings using a combination of sonication high shear mixing to insure uniform dispersion MWCNT. The composite test specimens tested an oxyacetylene bed (OTB) applying heat flux 1000 W/cm for duration 45 seconds. Composite with showed reduction in mass loss, recession length, situ temperatures compared...

Magnetic Field Assisted Additive Manufacturing (MFAAM), 3D printing in a magnetic field, has the potential to fabricate high strength anisotropic bonded magnets. Here, 10, 35, and 54 wt% strontium ferrite magnets using polyamide 12 binder were developed by twin screw compounding process then printed via MFAAM samples zero, 0.5 Tesla (H parallel print direction bed). The hysteresis curves measured MicroSense EZ9 Vibrating Sample Magnetometer (VSM) for 3 different mount orientations of sample...

A comprehensive review was conducted on the research and development of polymer nanocomposites used as thermal protection systems (TPS) for re-entry vehicles nozzle internal insulation materials propulsion systems. This paper summarizes significant R&D efforts studies nanostructured ablative by scientists from China, India, Italy, Iran, US past decade. Thermoset, thermoplastics, elastomers, thermoplastic elastomers were matrices. Nanomaterials, such montmorillonite organoclays, carbon...

The introduction of new type nanomaterials has provided challenges in a deeper level understanding mechanical behavior and failure mechanisms fiber-reinforced composites. In this study, comparison low-velocity impact E-Glass epoxy composites modified with 10 wt% nanosilica 2.5 Nafen™ alumina nanofibers manufactured using vacuum-assisted resin transfer molding is reported. Low-velocity tests at three energies 29 J, 39 50 J are conducted responses, such as strength, absorbed energy, damage...

Polymer matrix composites (PMC), often referred to as fiber reinforced plastics (FRP), consist of reinforcement (E-glass, S2-glass, aramid, carbon, or natural fibers) and polymer matrix/resin (polyester, vinyl ester, polyurethane, phenolic, epoxies). Eglass/polyester E-glass/vinyl ester are extensively used in the marine, sports, transportation, military, construction industries. These industries primarily use low-cost open molding processes, such manual/spray lay-up. Polyester resin systems...

The aim of this study is to investigate the influence nanosilica on glass-reinforced epoxy composites under static mechanical and tension–tension fatigue loading. were manufactured with three different concentrations (6, 7, 8 wt%). Static tests include tensile, flexure short-beam strength. 6 wt% showed greatest enhancement in tensile strength, percentage elongation, inter-laminar shear strength compared other control. Extensive (R-ratio 0.1 frequency 2 Hz) conducted control composites. In...

To better understand Magnetic Field Assisted Additive Manufacturing (MFAAM) the effect of a magnetic field on orientation and distribution particles in molten composite was studied. Vibrating Sample Magnetometer (VSM) measurements were made Sr-ferrite/PA12 fused deposition modeling filaments different packing fraction (5 40 wt. %). The rotation sample’s moment upon application perpendicular to easy axis monitored with biaxial VSM above PA12’s softening temperature. observed transients depend...

Abstract NOTE: The first page of text has been automatically extracted and included below in lieu an abstract Session 2003-1482 INTRODUCTION TO LOW COST MANUFACTURING OF COMPOSITE LAMINATES Ajit D. Kelkar, Jitendra S. Tate Ron Bolick Department Mechanical Engineering North Carolina A & T State University, Greensboro, NC 27411 kelkar@ncat.edu INTRODUCTION: This new laboratory experiment MEEN 300 Experimental Methods undergraduate mechanical engineering curriculum, presents low cost...

Braided composites have good properties in mutually orthogonal directions; more balanced than unidirectional laminates and better impact resistance. These are being considered as a primary load carrying components place of conventional laminated composites. They manufactured by using new process such Vacuum Assisted Resin Transfer Molding (VARTM). This is low cost, affordable suitable for high volume manufacturing environment. In VARTM process, the flow resin occurs in-plane well transverse...

The magnetic hysteresis and viscosity of SrO(Fe2O3)6/PA-12 filaments with 5wt% 26wt% was determined a biaxial VSM. curves indicate that manufactured samples have flow induced anisotropy an easy plane perpendicular to the filament’s cylindrical axis. Mx My signals vary field angle. is maximum in decreases factor two along macroscopic hard axis filament. nearly zero for intermediate angles.

The objective of this study is to evaluate thermal properties polyamide 11 (PA11)/nanographene platelet (NGP) nanocomposites. Samples were prepared using 1 wt%, 3 and 5 wt% NGPs. Isopropyl alcohol (IPA) was used as a solvent assist in dispersion the NGPs within PA11 powder. hand mixed evenly into powder wooden dowel. Morphological characterization PA11/NGP nanocomposite conducted scanning electron microscopy. Thermal nanocomposites includes thermogravimetric analysis, differential...

Ablative materials are used as thermal protection systems (TPS) for reentry vehicles and solid rocket motor (SRM) nozzle applications. Phenolic cyanate ester the state-of-the-art (SOTA) resin in many of ablative composites today, including MX-2600 (silica/phenolic) from Cytec Solvay Group. While these ablatives have worked well, more demanding requirements drive need affordable lightweight advanced capable handling high heat fluxes with minimal mass loss. These result lighter shields motors,...

All branches of the U.S. military are currently conducting nanotechnology research, including Defense Advanced Research Projects Agency (DARPA), Office Naval (ONR), Army (ARO), and Air Force Scientific (AFOSR). The United States is leader development nanotechnology-based applications for national defense. Advancements in intended to revolutionize modern warfare with such as nano-sensors, artificial intelligence, nanomanufacturing, nanorobotics. Capabilities this technology include providing...

Braided composites have more balanced properties than traditional tape laminates, and potentially better fatigue impact resistance due to the interlacing. The natural conformability of biaxial braided tubes makes it ideal preform for three-dimensional complex components. Braid tube fits on components with ease just like pulling socks feet. Thus cutting, stitching, or manipulation fiber placement is not needed, as in use woven fabrics. Biaxial find applications aerospace, automotive,...

Phenolic resin was modified using nanoclay to improve flammability/thermal properties. High-shear and planetary centrifugal (PC) mixing techniques were used blend into phenolic. This followed by vacuum-assisted transfer molding manufacture glass-reinforced nanocomposites. Loadings of 2.5, 5.0, 7.5 wt% processed both techniques. The degree dispersion analyzed scanning electron microscope transmission microscope. Flammability/thermal property evaluated mass loss calorimeter. Mechanical...