INFLUENCES OF FIBER WAVINESS ON MECHANICAL PROPERTIES OF INTERLAMINAR TOUGHENING CARBON FIBER/EPOXY COMPOSITE UNIDIRECTIONAL LAMINATE

Abstract

Abstract: In this study, interlaminar toughening carbon fiber /epoxy prepreg, i.e. X850, was adopted. Based on autoclave curing process, two kinds of unidirectional carbon fiber laminates with in-plane and out-of-plane waviness were fabricated by rolling prefabricated out-of-plane waviness and inserting prepreg strip into prepreg stack, respectively. The two kinds of fiber waviness defects in composites were characterized. In addition, tensile and compressive properties were measured and analyzed. The experimental results show that composite specimens containing different fiber waviness ratio (WR) were obtained with almost the same fiber content without other defects. For the range of prefabricated WR, the effect of out-of-plane wrinkling on tensile property can be neglected and compressive property decrease slightly. However, tensile and compressive properties are very sensitive to in-plane buckling. Their modulus, strength and failure mode change significantly, as WR increases. It is indicated that the type of fiber waviness is very important for evaluating this kind of defect.

Key words: carbon fiber composite, interlaminar toughening, fiber waviness, in-plane buckling, out-of-plane wrinkling, mechanical property

CLC Number:

TB332

XU Peng, GU Yi-zhuo, WU Chen-jun, GAO Long-fei. INFLUENCES OF FIBER WAVINESS ON MECHANICAL PROPERTIES OF INTERLAMINAR TOUGHENING CARBON FIBER/EPOXY COMPOSITE UNIDIRECTIONAL LAMINATE[J]. Fiber Reinforced Plastics/Composites, 2019, 0(3): 49-54.

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