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首页> 外文期刊>Journal of Composite Materials >Effects of machined circular holes on the mechanical properties of unidirectional carbon fiber-reinforced plastics
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Effects of machined circular holes on the mechanical properties of unidirectional carbon fiber-reinforced plastics

机译：机加工圆孔对单向碳纤维增强塑料机械性能的影响

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摘要

The effects of machined circular holes on the mechanical properties and failure characteristics of a unidirectional CFRP were investigated. Our approach was to change the location and the number of holes: (i) a two-set hole was machined with different modes: (A) parallel, (B) 45 degrees and (C) a direction perpendicular to the loading direction; and (ii) multiple holes from n=0 to 5 were made in the sample parallel to the loading direction. The higher tensile and higher fatigue strengths were obtained for the CFRP sample produced by mode A, compared to modes B and C. This was attributed to the different extend of the maximum stress and stress distribution, caused by the geometrical effects on the sample. The ultimate tensile strength (sigma(UTS)) of the sample was well predicted by the geometrical criterion. If the number of holes was increased from n=0 to n=2, the tensile strength decreased dramatically. However, the tensile strength did not strongly decrease further for samples with multiple holes from n=2 to 5. The tensile strength is correlated with the maximum stress adjacent to the hole(s). Those stress values were verified by a 2D digital image correlation and a finite element analysis. Material failure of the CFRP during tensile loading was revealed by nondestructive testing using a piezoelectric ceramic, and debonding of the fibers occurred even at a low applied stress of approximately 35% sigma(UTS).
机译：研究了对单向CFRP的机械性能和机械性能和失效特性的影响。我们的方法是改变位置和孔的数量：（i）用不同模式加工两个设定的孔：（a）平行，（b）45度和（c）垂直于装载方向的方向; （ii）在平行于装载方向的样品中制造从n = 0至5的多孔。与模式B和C的模式A产生的CFRP样品获得较高的拉伸和更高的疲劳强度。这归因于由样品上的几何效应引起的最大应力和应力分布的不同延伸。通过几何标准预测样品的最终拉伸强度（Sigma（UTS））。如果从n = 0增加到n = n = 2，则拉伸强度急剧下降。然而，对于具有N = 2至5的具有多孔的样品，拉伸强度进一步没有强烈降低。拉伸强度与孔邻近的最大应力相关。通过2D数字图像相关和有限元分析验证了那些应力值。通过使用压电陶瓷的非破坏性测试揭示了CFRP期间CFRP的材料衰竭，并且即使在大约35％Sigma（UTS）的低施加应力下也会发生纤维的剥离。

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