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当前位置: 首页 > 文章 > 基于纳米压痕的木材细胞壁力学测量值与加载载荷相关性研究 林业工程学报 2021 (4) 64-71
Position: Home > Articles > Study on correlation between mechanical measurement of wood cell wall and added load by nano-indentation Journal of Forestry Engineering 2021 (4) 64-71

基于纳米压痕的木材细胞壁力学测量值与加载载荷相关性研究

作  者：
蔡绍祥;李延军;黄燕萍;郭玉良
单  位：
常熟理工学院纺织服装与设计学院;南通理工学院建筑工程学院;南京林业大学材料科学与工程学院
关键词：
细胞壁;纳米压痕;蠕变;黏弹性;木材微观力学
摘  要：
通过改变纳米压痕过程中加载函数的具体参数值,研究了加载载荷与木材细胞壁弹性模量、硬度和蠕变性能的关系,并探求在木材细胞壁线性黏弹性范围内合适的加载载荷。研究结果表明:在测试过程中,当加载载荷逐渐增大时,马尾松木材细胞壁弹性模量变化明显;载荷为200μN时,弹性模量达到最大值,随后保持相对稳定;载荷达到400μN时弹性模量开始减小;改变加载载荷测得的木材细胞壁硬度随加载载荷的增加而逐渐变大,最大增幅为10%左右;探针压痕深度随着加载载荷的增加逐渐变大,载荷增加对压痕深度影响显著;蠕变率随着加载载荷的增加而逐渐增加,最大增幅为70%;应变率和蠕变应力都具有二段式变化趋势,第1阶段在4～6 s时变化较大,第2阶段在7～10 s时变化平缓。利用幂次律对试验数据进行分析表明,加载力为150～300μN时可近似认为是线性黏弹性行为。然后结合不同加载载荷对弹性模量和硬度的影响,综合相关参数可以判断,在对马尾松之类的针叶材进行纳米压痕试验时,合适的加载载荷范围为200～300μN。
译  名：
Study on correlation between mechanical measurement of wood cell wall and added load by nano-indentation
作  者：
CAI Shaoxiang;LI Yanjun;HUANG Yanping;GUO Yuliang;College of Textile, Garment and Design, Changshu Institute of Technology;College of Materials Science and Engineering, Nanjing Forestry University;Architectural Engineering Institute, Nantong Institute of Technology;
关键词：
cell wall;;nano-indentation;;creep;;viscoelasticity;;wood micromechanics
摘  要：
During the nano-indentation tests, the density, hardness and indentation depth of the material have great influence on the test results. The added load of different materials during the test is also different. Therefore, it is very important for the accuracy of the test results to explore the appropriate added load of wood cell wall in the nano-indentation test. In this study, the relationship between the added load and the modulus of elastic, hardness, and creep property of the wood cell wall was studied by changing the specific parameters of the loading function during the process of nano-indentation. The suitable load values in the linear viscoelastic range were obtained. The results showed that: the modulus of elastic of masson's pine cell wall changed obviously when the loading load increased gradually; when the load was 200 μN, the modulus of elasticity reached the maximum value and then remained stable; when the load reached 400 μN, the modulus of elasticity decreased; meanwhile, the hardness of wood cell wall increased with the increase of load. The creep rate increased with the increase of the added load, both the strain rate and creep stress had a two-stage change trend, the first stage had a large change at 4-6 s, while the second stage had a gentle change at 7-10 s. The power law was used to analyze the experimental data and it was shown that when the loading force was 150-300 μN, it could be approximately considered as a type of linear viscoelastic behavior. Based on the relevant parameters, it could be determined that the suitable loading range was 200-300 μN for the nano-indentation experiment on needles such as masson's pine. By applying the correlation between the mechanical measurement of wood cell wall and added load developed in this study, the nano-indentation method can provide more precise, reliable and repeatable measurements of hardness, Young's modulus and other mechanical properties for most wood species to help exploring new research, reduce product failures and accelerate the time from wood research-to-market.

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