Tensile Properties of Z-Pin Reinforced Laminates with Circumferentially Notched Z-Pins
Tensile Properties of Z-Pin Reinforced Laminates with Circumferentially Notched Z-Pins
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DOI：
10.3390/jcs4020078
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发表时间：
2020-06-01
影响因子：
3.3
通讯作者：
Scharr, Gerhard
中科院分区：
文献类型：
--
作者：
Knopp, Andre;Scharr, Gerhard
本文介绍了单向碳纤维/环氧树脂层合板的平面内拉伸性能的实验研究与周向缺口z销与不同的缺口设计。从结果中可以得出结论，在z销表面上应用圆周切口，切口深度为20 μ m，距离为100 μ m，对平面内拉伸强度值没有显著影响，无论切口设计如何。对于圆形和矩形缺口设计，没有观察到抗拉强度与缺口深度的相关性。只有在恒定的缺口深度和宽度下改变缺口距离，才能导致拉伸强度值随缺口距离的增加而小幅增加。所确定的拉伸模量值表明，无论考虑哪种切口设计，用无切口和周向切口Z-销增强的层压板之间没有实质性偏差。可以观察到，拉伸模量不依赖于缺口深度和距离。因此，可以假设，影响面内拉伸性能的微观结构变化不会改变，或仅在很小的程度上，通过销表面上的缺口的存在。
This paper describes experimental investigations on the in-plane tensile properties of unidirectional carbon-fibre/epoxy laminates reinforced with circumferentially notched z-pins with different notch designs. From the results it can be concluded that the application of circumferential notches at the z-pin surface with constant notch depth of 20 mu m and distance of 100 mu m has no significant effect on the in-plane tensile strength values, regardless of the notch designs investigated. For circular and rectangular notch designs, no dependence of the tensile strength from the notch depth could be observed. Only changing the notch distances at a constant notch depth and width leads to small increases in the tensile strength values with increasing notch distance. The determined tensile modulus values indicate that there are no substantial deviations between laminates reinforced with unnotched and circumferentially notched z-pins, no matter which notch design is considered. It can be observed that there are no dependencies of the tensile modulus from notch depth and distance. Therefore, it can be assumed that the microstructural changes influencing the in-plane tensile properties will not be changed, or only to a very small extent, by the presence of notches on the pin surface.