Fatigue behavior and failure mechanism of 3D-printed continuous glass fiber-reinforced PLA composites under rotating bending fatigue

IF 5.3 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access Pub Date : 2025-07-01 DOI:10.1016/j.jcomc.2025.100623

Mehrnoosh Javadian, Ali Dadashi, Abbasali Bagheri, Mohammad Azadi

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Abstract

This study investigates the fatigue behavior and failure mechanisms of 3D-printed polylactic acid (PLA) composites reinforced with continuous glass fibers under rotating bending fatigue. Composite specimens were fabricated using a modified fused deposition modeling (FDM) printer with fiber volume fractions of 16 %. Fatigue testing was conducted under fully reversed loading at room temperature, and fracture surfaces were analyzed using field-emission scanning electron microscopy (FE-SEM). Results indicate that fiber reinforcement significantly enhances fatigue resistance, with fiber orientation (+45/-45) and infill density playing critical roles in improving performance. A Poisson regression model confirmed the statistical significance of all main effects and two interactions, with print direction having the greatest influence. Fractographic analysis revealed void, fiber breakage, and fiber-matrix debonding as key failure modes. The study provides crucial insights for optimizing composite materials for applications involving cyclic loading.

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旋转弯曲疲劳下3d打印连续玻璃纤维增强PLA复合材料的疲劳行为及失效机理

研究了连续玻璃纤维增强3d打印聚乳酸（PLA）复合材料在旋转弯曲疲劳下的疲劳行为和破坏机制。使用纤维体积分数为16%的改进熔融沉积建模（FDM）打印机制备复合材料样品。在室温下进行了完全反向载荷下的疲劳试验，并用场发射扫描电镜（FE-SEM）分析了断口表面。结果表明，纤维增强显著提高了材料的抗疲劳性能，纤维取向（+45/-45）和填充密度是提高材料抗疲劳性能的关键因素。泊松回归模型证实了所有主效应和两种相互作用的统计显著性，其中印刷方向的影响最大。断口分析显示，空洞、纤维断裂和纤维-基体脱粘是主要的破坏模式。该研究为优化复合材料的循环加载应用提供了重要的见解。

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