DRY PREFORM, ANNULAR STRUCTURE MADE OF COMPOSITE MATERIAL AND METHOD OF MANUFACTURING ANNULAR STRUCTURE

• Main Authors: NISHIYAMA SHIGERU, HIROKAWA TETSURO
• Format: Patent
• Language: English
• Published: 22.10.2012
• Subjects: AEROPLANES; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; AIRCRAFT; AVIATION; COSMONAUTICS; HELICOPTERS; INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; MAKING GRANULES OR PREFORMS; PERFORMING OPERATIONS; PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

PROBLEM TO BE SOLVED: To provide a strong and lightweight annular dry preform, which is easily formed and has high design flexibility, and an annular structure made of a composite material using the dry preform.SOLUTION: The dry preform includes a first reinforcing fiber layer 11 formed of reinforcing fibers which are wound around an outer periphery of a mandrel 20, are aligned in parallel to a direction (+θ direction) in which the reinforcing fibers intersect with an annular direction (0° direction) of the mandrel 20 and seamlessly continue in the annular direction of the mandrel 20 by an amount of at least one turn.