표면 결함을 가지는 복합재료 후판에서의 인장특성 연구

Abstract

The development of industry in the composite material has been applied in many industries are trying to move very dynamically.

Specially, Wind generators in particular for the fabrication of large structures using composite material is increasing significantly. Production of large composite structures has been used by VATRM process.

However, VARTM process to create large structures includes a lot of symptoms. Especially void area is occurred on the surface of the product. To eliminate these defects, the surface of the structure needs repair.

In order to check the effect on the surface of composite materials including the void area, the 7mm plate of specimen was made with void area. Mechanical strength was measured and analyzed through tensile tests, Also compared to that of the void free area.

In this study, the volume of material remains the same, but the surface defects inserted by changing the position and thickness of void area were designed with three different groups.

The inserted void rate of the specimen is between 2.5% and 7.7%. In addition, compare to the void free specimen, tensile strength is decreased at approximately 11%.

As a result of observing the fracture plane delamination showed similar appearance. Also external shock can affect that the material's peeling being happened. In other words, if surface porosity is found, that needs some repair.

The VARTM process to create large structures, the strength and safety will be improved if the variables which could include pores are removed as much as possible.