This study provides extensive information regarding the resistance of the material to maintain its properties under dynamic loading conditions. The effects of dynamic loading conditions on PLA reinforced with various fibers produced via the material extrusion were investigated. Specifically, it examined the material's response to an increase in the number of shock impacts in comparison to the control specimen. X-ray diffraction analysis and Raman spectroscopy were employed to validate the material's amorphous composition and crystallinity. The morphological alterations were illustrated using scanning electron microscopy images and digital microscopic images. Carbon fiber-reinforced PLA demonstrated superior resistance to phase transitions under impact loading conditions compared to other materials. The agreement between the x-ray diffraction and Raman spectroscopy results confirms the material's reliability under dynamic loading conditions. The phases of pure PLA and PLA-GF remained unchanged until 50 shocks, at which point their crystallinity transformed into an amorphous state. The PLA-CF did not exhibit any phase alterations until 150 shocks. The tensile strength of the specimens is assessed following 50 shock exposure cycles, revealing a notable decrease in the tensile strength of PLA and PLA-GF. In contrast, PLA-CF exhibits only a slight decline, due to its improved resistance to phase change.

Graphical Abstract

中文翻译：

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动态冲击载荷条件下挤出纤维增强聚乳酸现有相的可持续性

这项研究提供了有关材料在动态负载条件下保持其性能的阻力的广泛信息。研究了动态载荷条件对通过材料挤出生产的各种纤维增强的 PLA 的影响。具体来说，与对照样本相比，它检查了材料对冲击次数增加的响应。采用 X 射线衍射分析和拉曼光谱来验证材料的无定形成分和结晶度。使用扫描电子显微镜图像和数字显微图像说明形态变化。与其他材料相比，碳纤维增强 PLA 在冲击载荷条件下表现出优异的抗相变能力。 X 射线衍射和拉曼光谱结果之间的一致性证实了该材料在动态负载条件下的可靠性。纯 PLA 和 PLA-GF 的相在 50 次冲击之前保持不变，此时它们的结晶转变为无定形状态。 PLA-CF 直到 150 次冲击才表现出任何相位变化。经过 50 个冲击暴露循环后，对样品的拉伸强度进行了评估，结果表明 PLA 和 PLA-GF 的拉伸强度显着下降。相比之下，PLA-CF 仅表现出轻微下降，因为其抗相变能力有所提高。

图形概要