Abstract Novel procedure is proposed for simultaneous evaluation of fiber tensile strength and interfacial shear strength of carbon fiber based on fragmentation test. Polyamide 6 was utilized as a matrix polymer. Relation between defect density λ and fiber strain ef was derived. Stepwise strain was applied to the specimen and increment of λ against ef was measured at each step. Accumulation of several test results gave smooth increment of λ till saturation. From the linear region in the double-logarithm plot of λ against ef, Weibull parameters for fiber strength were estimated. Somewhat higher fiber strength was observed by the proposed method as compared with that from the single fiber tensile test. The interfacial shear strength estimated from the saturated λ value (λ∞) and the measured fiber strength was comparable to the reported values, indicating the versatility of the proposed method. The proposed procedure could also be applied to the short carbon fiber length specimen, showing the applicability for the evaluation of recycled carbon fibers.

中文翻译：

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使用碎裂试验同时评估短长度碳纤维的拉伸强度和界面剪切强度

摘要 提出了一种基于破碎试验同时评价碳纤维纤维抗拉强度和界面剪切强度的新方法。聚酰胺6用作基质聚合物。推导出缺陷密度λ与纤维应变ef之间的关系。对试样施加逐步应变，并在每一步测量 λ 相对于 ef 的增量。几个测试结果的积累给出了λ的平滑增量直到饱和。从 λ 对 ef 的双对数图中的线性区域，估计纤维强度的威布尔参数。与单纤维拉伸试验相比，所提出的方法观察到更高的纤维强度。从饱和 λ 值 (λ∞) 估计的界面剪切强度和测量的纤维强度与报告值相当，表明所提出方法的多功能性。所提出的程序也可以应用于短碳纤维长度试样，显示出对再生碳纤维评估的适用性。