基于断裂理论的竹纤维复合材料拉伸强度的尺寸效应研究

复合材料科学与工程 ›› 2021, Vol. 0 ›› Issue (2): 11-18.

基于断裂理论的竹纤维复合材料拉伸强度的尺寸效应研究

哈维尔¹, 刘问^1,2*, 孟鑫淼^1,2, 张涵政¹, 李康宁¹

1.北京林业大学水土保持学院,北京100083;
2.北京林业大学水土保持国家林业局重点实验室,北京100083

收稿日期:2020-05-09 出版日期:2021-02-28 发布日期:2021-03-10
通讯作者: 刘问(1983-),女,博士,副教授,主要从事竹木结构与工程断裂力学方面的研究,liuwen@bjfu.edu.cn。
作者简介:哈维尔(1993-),男,硕士研究生在读,主要从事竹木结构方面的研究。
基金资助:
云南省交通运输厅科技项目([2018]39);国家自然科学基金资助项目(51908038)

SIZE EFFECT STUDY OF TENSILE STRENGTH OF BAMBOO
FIBER COMPOSITES ON THE BASIS OF FRACTURE THEORY

NCHAMA Javier¹, LIU Wen^1,2*, MENG Xin-miao^1,2, ZHANG Han-zheng¹, LI Kang-ning¹

1. School of Water and Soil Conservation, Beijing Forestry University, Beijing 100083, China;
2. Key Laboratory of State Forestry Administration on Soil and Water Conversation, Beijing Forestry University, Beijing 100083, China

Received:2020-05-09 Online:2021-02-28 Published:2021-03-10

摘要/Abstract

摘要： 以重组竹为代表的竹纤维复合材料是具准脆性断裂特征的生物基纤维复合材料,强度值存在尺寸效应问题,影响其构件的设计理论。为研究重组竹的强度尤其是纵向拉伸强度的尺寸效应现象,进行了三点弯曲试验与直接拉伸试验测试材料的尺寸效应行为,并应用基于断裂理论的拉伸强度模型分析材料缺陷尺寸及尺寸效应的计算方法。试验结果表明,重组竹的拉伸强度存在明显的尺寸效应现象,而基于断裂理论的拉伸强度模型可计算不受尺寸效应限制的理论塑性拉伸强度,且该塑性拉伸强度考虑了材料表面的缺陷影响。因此,尺寸效应对重组竹纵向拉伸强度的影响可采用理论塑性拉伸强度与表面缺陷尺寸确定。

关键词: 重组竹, 准脆性断裂, 尺寸效应, 拉伸强度, 缺陷尺寸, 复合材料

Abstract: As a fibrous bio-composite material with quasi-brittle fracture property, bamboo fiber composites represented by bamboo scrimber has the size effect problem in its material strength, which would influence the design theory of its components. In order to solve the size effect problem of bamboo scrimber in its material strength, especially the longitudinal tensile strength, the three-point-bending test and direct tensile test were carried out to measure the size effect behavior. Meanwhile, the calculating methods of material defect and size effect were analysed by the tensile strength models on the basis of fracture theory. The test results show that the tensile strength of bamboo scrimber has obvious size effect phenomenon. However, by the tensile strength model on the basis of fracture theory, the theoretical plastic tensile strength of bamboo scrimber in its fiber direction, which considered the influence of material surface defect, was independent from size effect. Therefore, the influence of size effect can be determined by the theoretical plastic tensile strength and the defect size.

Key words: bamboo scrimber, quasi-brittle fracture, size effect, tensile strength, defect size, composites

中图分类号:

TB332

哈维尔, 刘问, 孟鑫淼, 张涵政, 李康宁. 基于断裂理论的竹纤维复合材料拉伸强度的尺寸效应研究[J]. 复合材料科学与工程, 2021, 0(2): 11-18.

NCHAMA Javier, LIU Wen, MENG Xin-miao, ZHANG Han-zheng, LI Kang-ning. SIZE EFFECT STUDY OF TENSILE STRENGTH OF BAMBOO
FIBER COMPOSITES ON THE BASIS OF FRACTURE THEORY[J]. COMPOSITES SCIENCE AND ENGINEERING, 2021, 0(2): 11-18.

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