North Carolina Agricultural and Technical State University

South Dakota School of Mines and Technology

Ajit Kelkar

Hao Fong

Lifeng Zhang

Ronnie L Bolick

Mohammad B Uddin

Chuilin Lai

Shashwata Chakraborty

Methods of repairing damaged composites are described. The damaged composites can comprise a polymeric matrix and one or more layers of fibers (e.g., carbon or glass fibers). According to the described method, the damaged area of the composite is replaced by an insert comprising a core geometry and radial projections. The insert can comprise the same polymeric matrix and one or more layers of fibers as the original composite of the damaged composite. The method can provide a repaired composite with greater compressive strength and/or greater tensile strength than a composite repaired with a traditional patch having no radial projections.

Repair shape and technique for composite laminates

The present application discloses carbonaceous nano-fibrous materials developed by electrospinning mixtures of alkali lignin with a polymer at varied mass ratios. The present application also discloses processing of the lignin/polymer fibers via progressive heat treatments for stabilization, pre-carbonization and carbonization. The resulting carbon nanofibers maintain a uniform shape and have high specific surface area.

Production of carbonaceous nano-fibrous materials with ultra-high specific surface area from alkali (Kraft) lignin

The present invention provides a process for forming a composite material. The present invention further provides methods of improving the fiber volume fraction and/or the dimensional thickness of a composite panel.

Heat vacuum assisted resin transfer molding processes for manufacturing composite materials

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Greensboro, NC, United States of America

Ajit Kelkar