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Influence of voids and layers number on mechanical properties of hand lay-up bended laminates

Kukliński M.

Journal of Polish CIMAC

2011

Vol. 6, no 3

69-74

Composite materials are broadly used in industry. In maritime industry composite materials with great success supersede conventional materials as steel and wood. Engine foundations and power-transmitting shafts belong to the newest applications of composite materials in maritime industry. Composite shafts are fabricated predominantly by rowing method but for engine foundations hand lay-up method is still used. One of the greatest disadvantages of hand lay-up (contact) method is hazardous distribution of resin matrix and voids or air blisters that remain in bulk resin matrix or may stick to reinforcement fibres. This hazardous distribution of resin may cause inaccuracies in calculation of voids percentage in laminate. If an air blister sticks to a fibre its prejudicial influence on laminate resistance is greater than if it remains in bulk resin. Number of layers that constitute a laminate influences the maximum bending stress in specimen. This relation however is different from that in tensile tests.