This study presents a novel probabilistic modeling approach to investigate the impact of interfacial damage between fibers and the matrix on 3D-printed composites. The approach employs effective field methods (EFM) and Weibull statistics and considers an elastoplastic matrix reinforced with short fibers. A new formulation is developed to compute normal and shear interface stresses using the internal stress of each fiber, which is modeled as an ellipsoid with various aspect ratios. The approach is applied to 3D-printed PLA reinforced with short basalt fibers and compared to literature experiments. The results demonstrate that the proposed approach can aid in understanding interfacial damage and explain the progressive softening of the stress–strain response of composite structures.

中文翻译：

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使用有效场方法对短纤维 3D 打印复合材料中的纤维-基体界面应力进行概率建模

这项研究提出了一种新颖的概率建模方法来研究纤维和基体之间的界面损伤对 3D 打印复合材料的影响。该方法采用有效场方法 (EFM) 和威布尔统计，并考虑用短纤维增强的弹塑性基体。开发了一种新的公式，使用每根纤维的内应力来计算法向和剪切界面应力，该公式被建模为具有各种纵横比的椭球体。该方法应用于用短玄武岩纤维增强的 3D 打印 PLA，并与文献实验进行比较。结果表明，所提出的方法可以帮助理解界面损伤并解释复合材料结构应力应变响应的逐渐软化。