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Fracture toughness of flax braided yarn woven PLA composites
International Journal of Polymer Analysis and Characterization ( IF 1.9 ) Pub Date : 2021-03-15 , DOI: 10.1080/1023666x.2021.1892424
Sateeshkumar Kanakannavar 1 , Jeyaraj Pitchaimani 1
Affiliation  

Abstract

Flax fiber braided yarn plain woven fabric reinforced Poly Lactic Acid (PLA) bio-composites are fabricated using film stacking and hot-press compression molding method. Effect of fiber weight fraction on tensile and fracture properties of the bio-composites is studied and fractured surfaces are analyzed using scanning electron microscope (SEM) images. It is found that tensile modulus and strength increases by 62.11 and 59.75% respectively for 35 wt.% of the braided fabric reinforcement compared to pristine PLA. Fracture toughness study is performed on single-edge-notched-bend (SENB) specimens using three point bending method. It is found that plane-strain fracture toughness (KIC) and strain energy release rate (GIC) values of the PLA composites are 71.61 and 124% higher than pure PLA for 35 wt.% braided fabric reinforcement. KIC values of the braided fabric reinforced PLA composites are much high compared to similar natural fiber composites reported in literature. This is attributed to high resistance offered by the interweaving yarns of the braided fabric hence more energy is required to begin crack propagation compared to other typical forms of reinforcement.



中文翻译:

亚麻编织纱编织的PLA复合材料的断裂韧性

摘要

亚麻纤维编织纱平纹机织增强聚乳酸(PLA)生物复合材料是采用膜堆叠和热压压缩成型的方法制备的。研究了纤维重量分数对生物复合材料拉伸和断裂性能的影响,并使用扫描电子显微镜(SEM)图像分析了断裂表面。发现与原始的PLA相比,对于35wt。%的编织织物增强物,拉伸模量和强度分别增加了62.11和59.75%。使用三点弯曲法对单边缘缺口弯曲(SENB)试样进行断裂韧性研究。发现平面应变断裂韧性(K IC)和应变能释放率(G IC)对于35 wt。%的编织织物增强材料,PLA复合材料的)值比纯PLA高71.61和124%。与文献报道的类似天然纤维复合材料相比,编织织物增强的PLA复合材料的K IC值高得多。这归因于编织织物的交织纱线提供的高阻力,因此与其他典型形式的增强材料相比,开始裂纹扩展需要更多的能量。

更新日期:2021-04-12
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