平織炭素纖維强化複合材料의 볼트結合部에 關한 强度 評價

Abstract

In recently years, there have been rapid technological developments in the range of application of woven composites. The composite materials have unique properties such as high specific strength and stiffness. Especially, laminated woven fabrics CFRP (carbon fiber reinforced plastics) have been wished the strength, stiffness and mechanical properties according to the degrees laminated, fiber arrangement. These advantages have led to their application in the ship, transportation, aerospace, optical, and electronic fields. When mechanical fasteners are used for joining composites, stress concentrations developed near the edge of holes prepared for accommodating structural bolts or rivets. The main objective of bolted joints is to transfer applied load from one part of the joint structure to the other through fastener elements. However, the presence of bolt holes induces high stress concentrations, which are hence recognized to be a source of damage. Failure will then frequently occur in the vicinity of those holes. In addition, poor machining and drilling operations result in the appearance of defect such as delamination and fiber pull-out etc. The current work aim is to estimate the strength characteristics of the plain woven CFRP composite according to the diameter of bolted joint and the numbers of joint.