缝纫工艺与铺层构型对竹篾复合材料力学性能的影响
Effects of Stitching Technique and Lay-Up Configuration on Mechanical Properties of Bamboo Strip Composites
- 2025年39卷第4期 页码:68-77
DOI: 10.12326/j.2096-9694.2025027
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1.华南农业大学材料与能源学院,广东广州 510642
2.华南农业大学生物质工程研究院,广东广州 510642
收稿日期:2025-03-22,
修回日期:2025-04-19,
录用日期:2025-04-22,
纸质出版日期:2025-07-30
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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]
s
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]
s
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]
s
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。
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
]
s
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
]
s
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
]
s
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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