Disclosed herein are cannular assemblies composed of multiple concentric layers of sealing, reinforcement, sensing and monitoring components, pressure injected fluids, and over-molded structural and protection layers. An innermost sealing layer is provided with an optional overlay for improved resistance to diffusion and permeation. Either of the sealing layer or optional overlay, or both, is fabricated with permeation-resistant material. Also disclosed are related methods of manufacture.

Disclosed are methods and related compositions for producing a positive-locking load application for rod-shaped fiber composite structures, and the design thereof. The present invention concerns a method for producing a positive-locking load application for tension-compression rods from a fiber plastic hollow structure by means of an outer sleeve. In this process, a force pushes the fiber plastic hollow structure at least partially over at least one force application element, which is provided with at least one undercut to create a positive-locking connection. An object of the present invention is attained through local heating of the fiber plastic hollow structure to the point of plasticity of the fiber plastic hollow structure, at least in the region of the undercut(s) of the force application element, and application of at least one outer sleeve to the fiber plastic hollow structure in the region of the force application element.

Embodiments of the present invention provide a self-molding composite system for insulation and covering operations. The self-molding composite system may be cured to form any desired shaped for insulation and covering operations. The composite system comprises one or more layers that may create a rigid layered composite when cured. The one or more layers of the composite system may include a base layer that is a braided, knit, or non-woven fiber based substrate, an interstitial matrix layer, and customizable top coat. The customizable top coat may be a solvent based polymer solution that includes various additives that may include color pigments, additives for additional abrasion protection, additives for thermal protection, and/or additives for creating various textures or visible appearances to the composite system.

A variety of polymeric composites with tunable mechanical stiffness and electrical conductivity are claimed herein. For example, the composite may have an elastomeric matrix, a plurality of tunable particles, and a plurality of conductive fibers embedded in the matrix. The composites may also be a tunable foam matrix and an elastomeric matrix. In some embodiments, the composites are a low melting point alloy (LMPA) foam infiltrated by an elastomer, whose stiffness can be tuned by more than two orders of magnitude through external heating. In other embodiments, the composite may be a conductive particle-fiber-matrix three-component composite capable of changing its elastic rigidity rapidly and reversibly when powered with electrical current.

A variety of polymeric composites with tunable mechanical stiffness and electrical conductivity are claimed herein. For example, the composite may have an elastomeric matrix, a plurality of tunable particles, and a plurality of conductive fibers embedded in the matrix. The composites may also be a tunable foam matrix and an elastomeric matrix. In some embodiments, the composites are a low melting point alloy (LMPA) foam infiltrated by an elastomer, whose stiffness can be tuned by more than two orders of magnitude through external heating. In other embodiments, the composite may be a conductive particle-fiber-matrix three-component composite capable of changing its elastic rigidity rapidly and reversibly when powered with electrical current.

A fabrication method for a filter containing tragacanthin-polyvinyl alcohol (PVA) nanofibers includes obtaining a homogenous tragacanthin-PVA solution by obtaining a PVA solution by dissolving PVA in distilled water, and adding tragacanthin to the PVA solution. The method may further include obtaining a support layer by coating a stainless steel mesh with a thin layer of a hydrophobic polymer, coating a stainless steel mesh with the thin layer of the hydrophobic polymer comprising electrospinning a hydrophobic polymer solution onto the stainless steel mesh, and forming a tragacanthin-PVA nanofibrous web on the support layer by electrospinning the homogenous tragacanthin-PVA solution onto the support layer.

Proposed is a 3D over-printing device for over-printing a 3D shape on an existing structure, the device including: a vat containing a light-curable material; a driving part configured to fix the existing structure and move the existing structure vertically, layer by layer, within the vat; and an optical part comprising a projector and a mirror structure, and configured to photocure an area to be cured on a surface of the light-curable material by projecting UV light in several directions simultaneously from above the surface of the light-curable material toward the surface of the light-curable material that is upward exposed and in contact with the existing structure.

Aspects of the disclosure are directed to a panel configured for use on an aircraft nacelle, comprising: a first skin, a second skin, a first core portion coupled to the first skin and the second skin, a second core portion coupled to the first skin and the second skin, and an insert coupled to the first skin, the second skin, the first core portion, and the second core portion, the insert forming a corner fitting between the first core portion and the second core portion.

Aspects of the disclosure are directed to a panel configured for use on an aircraft nacelle, comprising: a first skin, a second skin, a first core portion coupled to the first skin and the second skin, a second core portion coupled to the first skin and the second skin, and an insert coupled to the first skin, the second skin, the first core portion, and the second core portion, the insert forming a corner fitting between the first core portion and the second core portion.

The inventive fiber manufacturing process is particularly adapted for demanding applications such as sports racquets. Because of the improved strength to weight ratio of components formed using the inventive method, a wide range of flexibility is achieved, allowing use of the inventive process to manufacture, for example, a fiber reinforced (for example, graphite) modular sports racquet, optionally provided with user-selectable weights and/or handle replacements. The inventive fiber (for example, graphite fiber) racquet frame is filled with a plastic foam and is formed using, for example, microencapsulation technology to time, generate and apply the pressure and gives the same or greater strength for a given size compared to conventional racquets. Advantageously, an outer tubular member may be used to form the racquet frame, with an inner tubular member extending around the head of the racquet frame.