A comparative study of the experimental and modeling for the creep-recovery behaviors of bamboo flour/polyethylene composites enhanced with a “rigid-flexible” grid structure

IF 5.6 1区农林科学 Q1 AGRICULTURAL ENGINEERING

Industrial Crops and Products Pub Date : 2025-02-01 DOI:10.1016/j.indcrop.2024.120301

Lei Chen , Xiaolong Hao , Haiyang Zhou , Jiamei Peng , Dengke Li , Dongpeng Chen , Rongxian Ou , Qingwen Wang

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Abstract

Creep behavior significantly restrict the application of natural fiber polymer composites (NFPCs) in high-value engineering fields. This study addresses this issue by constructing a novel rigid-flexible grid structure in bamboo flour/polyethylene composites (BPCs). This structure is constructed by incorporating a sandwich sheet composed of carbon fabric mesh prepreg (CFMP) and high-toughness casting films (MSF) through multi-layer co-extrusion. The resulting composites (BPC-CFMP-F) exhibited substantially improved bending properties and creep resistance. Bending strength increased by 88.2 %, 96.4 %, and 101.7 % at −20 °C, 30 °C, and 80 °C, respectively, while creep strain decreased by 18.2 %, 33.3 %, and 41.9 %. The Burgers and Findley models were employed to simulate the creep strains at different temperatures. An innovative method involving the mathematical fitting of recovery strains post-mirror processing offered novel insights into the deformation behavior and recovery dynamics of the composites. The Findley model demonstrated exceptional precision, with coefficients exceeding 0.99). This accuracy enabled the development of general constitutive equations to describe strain-related stress during both creep and recovery stages. These advancements enhance the application potential of NFPCs in contexts demanding high creep resistance and offer a reliable analytical tool for a comprehensive understanding of both creep and recovery phenomena.

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用 "刚柔并济 "网格结构增强竹粉/聚乙烯复合材料蠕变恢复行为的实验与建模对比研究

蠕变行为严重限制了天然纤维聚合物复合材料（NFPC）在高价值工程领域的应用。本研究通过在竹粉/聚乙烯复合材料（BPCs）中构建新型刚柔网格结构来解决这一问题。这种结构是通过多层共挤将碳纤维网格预浸料（CFMP）和高韧性浇铸膜（MSF）组成的夹层板材结合在一起而形成的。由此制成的复合材料（BPC-CFMP-F）的弯曲性能和抗蠕变性得到了大幅改善。在 -20 ℃、30 ℃ 和 80 ℃ 下，弯曲强度分别提高了 88.2%、96.4% 和 101.7%，而蠕变应变则分别降低了 18.2%、33.3% 和 41.9%。在模拟不同温度下的蠕变应变时，采用了 Burgers 和 Findley 模型。一种涉及镜面加工后恢复应变数学拟合的创新方法为复合材料的变形行为和恢复动态提供了新的见解。芬德利模型的精度极高，系数超过 0.99）。这种精确性使我们能够开发通用的构成方程，以描述蠕变和恢复阶段与应变相关的应力。这些进展提高了无纺布复合材料在要求高抗蠕变性的环境中的应用潜力，并为全面了解蠕变和恢复现象提供了可靠的分析工具。

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来源期刊

Industrial Crops and Products 农林科学-农业工程

CiteScore

9.50

自引率

8.50%

发文量

1518

审稿时长

43 days

期刊介绍： Industrial Crops and Products is an International Journal publishing academic and industrial research on industrial (defined as non-food/non-feed) crops and products. Papers concern both crop-oriented and bio-based materials from crops-oriented research, and should be of interest to an international audience, hypothesis driven, and where comparisons are made statistics performed.