Effect of layer thickness of prepreg on static and dynamic flexural properties of continuous carbon fiber reinforced polyamide 6

M. Yamane, Shota Nakakubo, Koutarou Koizumi, H. Uematsu, S. Tanoue
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引用次数: 1

Abstract

The effect of layer thickness of prepreg on the static and dynamic flexural properties of quasi-isotropic carbon fiber reinforced polyamide 6 laminates were investigated. The layer thickness of each ply was set to 40, 80 and 120 µm by using thin-ply prepreg with a thickness of about 40 µm made by tow-spreading technology. Four-point flexural tests were carried out to evaluate the static flexural properties of the laminated materials. The results showed that the flexural strength and modulus did not change much as the layer thickness change. The delamination at interlaminar was interestingly inhibited with decrease of layer thickness. Charpy impact strength evaluated as the dynamic flexural properties was affected by the layer thickness depending on the impact direction. In the impact test where the applied load was parallel to the laminates (edgewise test), the Charpy impact strength was almost unaffected by the layer thickness change. In contrast, Charpy impact strength increased with increasing layer thickness where the applied load was normal to the laminates (flatwise test). In the observation of the fracture appearance after edgewise test, the fiber fractures were observed independent of the layer thickness. Meanwhile, the occurrence of the cracking and delamination at interlaminar were effectively suppressed with decrease of layer thickness in the specimen after flatwise test. The delamination at interlaminar progressed in the in-plane direction with increasing layer thickness, resulting in large-scale delamination. As a result, a large amount of fracture energy could be absorbed. In conclusion, the layer thickness of the laminate is an important material design factor for controlling the impact properties of the composite materials.
预浸料层厚对连续碳纤维增强聚酰胺6静、动态弯曲性能的影响
研究了预浸料厚度对准各向同性碳纤维增强聚酰胺6层压板静、动态弯曲性能的影响。采用拖曳工艺制备厚度约为40µm的薄层预浸料,将每层厚度分别设置为40、80和120µm。采用四点弯曲试验对复合材料的静态弯曲性能进行了评价。结果表明,随着层厚的变化,抗弯强度和模量变化不大。随着层厚的减小,层间的分层现象明显受到抑制。以动态弯曲性能评价的夏比冲击强度随冲击方向的不同而受层厚的影响。在与层压板平行的冲击试验中(边向试验),夏比冲击强度几乎不受层厚变化的影响。相反,夏比冲击强度随着层厚的增加而增加,其中施加的载荷与层压板垂直(平面试验)。在观察边缘试验后的断裂形态时,观察到的纤维断裂与层厚无关。同时,随着平试后试样层厚的减小,层间裂纹和分层的发生得到有效抑制。随着层厚的增加,层间分层向面内方向发展,形成大规模的分层。因此,可以吸收大量的断裂能。综上所述,层厚是控制复合材料冲击性能的重要材料设计因素。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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