Free Vibration of Flax Braided Fabric PLA Beam under Edge Compression

ABSTRACT

The present study focuses on the development of biodegradable composites to replace synthetic polymer-based composites for potential lightweight structural applications in the automobile, aeronautical, marine, and packaging industries. Initially, PLA and NFBF/PLA films are prepared by solution casting, and from these films, composite laminates are prepared by film sequencing and compression (hot-press) molding methods. First, the critical buckling load (P_cr) of composites is analyzed, and then, the influence of compressive load on natural frequency is studied. The critical buckling load-bearing capacity of PLA is enhanced with the reinforcement of NFBF (natural fiber braided yarn fabric). The composite with three layers of NFBF registered the highest critical-buckling load (P_cr) of 374.19 N, and this value is 172.13% high compared to the virgin PLA. Similarly, the natural frequency of the NFBF composites approaches minimum when the applied load is equal to the corresponding P_cr. However, a significant increase in the fundamental frequency is noticed when the applied load is higher than the P_cr.

摘要

目前的研究重点是开发生物可降解复合材料, 以取代合成聚合物基复合材料, 用于汽车、航空、船舶和包装行业的潜在轻质结构应用. 最初, PLA和NFBF/PLA薄膜是通过溶液浇铸制备的, 从这些薄膜出发, 通过薄膜顺序和压缩 (热压) 成型方法制备复合层压板. 首先分析了复合材料的临界屈曲载荷, 然后研究了压缩载荷对复合材料固有频率的影响. 天然纤维编织纱织物 (NFBF) 的增强提高了PLA的临界屈曲承载能力. 具有3层NFBF的复合材料的最高临界屈曲载荷 (Pcr) 为374.19 N, 与原始PLA相比, 该值高172.13%. 同样, 当施加的荷载等于相应的Pcr时, NFBF复合材料的固有频率接近最小值. 然而, 当应用的频率高于Pcr时, 基频显著增加.

KEYWORDS:

• Braided yarn fabric
• PLA
• buckling strength
• free vibration
• natural frequency
• biocomposite

关键词:

• 编织纱织物
• 屈曲强度
• 自由振动
• 固有频率
• 生物复合材料

Acknowledgments

Authors wishes to acknowledge Prof. S M Kulkarni, FIST Composite Centre, NITK, Surathkal and Prof. Narendranath, Material Characterisation Lab, NITK Surathkal, for providing composites fabrication and testing facilities.

Disclosure statement

No potential conflict of interest was reported by the author(s).