Effects of Stitching Technique and Lay-Up Configuration on Mechanical Properties of Bamboo Strip Composites

LUO Yitian; LI Guoxin; HAO Xiaolong; SUN Lichao; OU Rongxian; FAN Qi; WANG Qingwen

doi:10.12326/j.2096-9694.2025027

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Effects of Stitching Technique and Lay-Up Configuration on Mechanical Properties of Bamboo Strip Composites
1.College of Materials and Energy，South China Agricultural University，Guangzhou 510642，Guangdong，China
2.Institute of Biomass Engineering，South China Agricultural University，Guangzhou 510642，Guangdong，China
Vol. 39, Issue 4, Pages: 68-77(2025)
DOI： 10.12326/j.2096-9694.2025027
稿件说明：

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罗怡田,李国鑫,郝笑龙等.缝纫工艺与铺层构型对竹篾复合材料力学性能的影响[J].木材科学与技术,2025,39(04):68-77. DOI： 10.12326/j.2096-9694.2025027.

LUO Yitian,LI Guoxin,HAO Xiaolong,et al.Effects of Stitching Technique and Lay-Up Configuration on Mechanical Properties of Bamboo Strip Composites[J].Chinese Journal of Wood Science and Technology,2025,39(04):68-77. DOI： 10.12326/j.2096-9694.2025027.

摘要

采用竹篾二维织物作为增强相，基于真空灌注工艺（vacuum infusion process，VIP）制备竹篾复合材料，系统研究缝纫行距与铺层构型（对称交错铺装）对竹篾复合材料力学性能的影响。结果表明，当缝纫行距为8 cm时，单向竹篾复合材料0°方向的拉伸、弯曲和冲击强度较未缝纫组分别提升7.6%、5.6%和15.3%；各层缝线错位分布可有效消除应力集中。铺层构型显著影响竹篾复合材料的力学性能，拉伸性能在［90/0/0］

构型的0°方向表现最优，拉伸强度和模量分别达到183 MPa和20.4 GPa。弯曲性能受表层竹篾取向调控，［0/0/90］

构型在0°方向具有最高的弯曲强度（320.4 MPa）和模量（17.1 GPa），同时表现出最佳抗蠕变能力。［90/0/0］

构型因其0°竹篾连续平行分布，应力传递更加均匀，故而在0°方向表现出最优的冲击性能，达91.4 kJ/m²，不同的铺层构型可有效调控竹篾复合材料的力学性能。本研究结果可为竹篾复合材料的工程应用提供一定的设计依据。

Abstract

Bamboo strip composites were fabricated using vacuum infusion process (VIP)

with two-dimensional woven fabrics prepared by stitching technique as reinforcements. The effects of stitch spacing and layup configuration (symmetrical and staggered forming) on mechanical properties were investigated. Results showed that at 8 cm stitch spacing

unidirectional composites in the 0° direction exhibited increased tensile

flexural

and impact strengths by 7.6%

5.6%

and 15.3%

respectively

compared to non-stitched samples. Furthermore

the staggered distribution of stitching threads across layers effectively mitigated stress concentration. However

excessively small stitch spacing causes damages in bamboo strips and resin-rich zones

reducing mechanical properties in the 0° direction. Furthermore

layup configuration significantly influences mechanical performance. Tensile properties improve with increasing concentration of unidirectional fiber layers

and the [90/0/0

]

configuration exhibits optimal performance in 0° direction

with tensile strength and modulus reaching 183 MPa and 20.4 GPa

respectively. Flexural properties are governed by surface layer orientation

with the [0/0/90

]

configuration showing maximum flexural strength (320.4 MPa) and modulus (17.1 GPa) in 0° direction

along with superior deformation resistance. The [90/0/0

]

configuration demonstrates optimal impact strength (91.4 kJ/m²) in 0° direction

attributed to th

e continuous distribution of 0° bamboo strip that effectively mitigates stress concentration. Various layup configuration effectively affect the mechanical properties of bamboo strip composites. This study provides design basis for the engineering application of bamboo-strip composites through the optimization of both process and structure.

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