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Inverse characterisation of gradient distribution of the modulus of bamboo using a four-point bending test
Holzforschung ( IF 2.4 ) Pub Date : 2021-07-01 , DOI: 10.1515/hf-2020-0155
Xianzhi Gao 1 , Guangyan Liu 1 , Lu Wang 1 , Yanan Yi 1 , Guang Lin 1 , Shaopeng Ma 1, 2
Affiliation  

As a natural graded material, bamboo has gradually increasing elastic modulus along the radial direction from the inner to the outer skin. Accurate measurement of the modulus distribution plays an important role in bamboo-based structural design. However, it is difficult to characterise this modulus distribution by using conventional testing approaches on bamboo slices. A more effective method was developed in this study for the inverse identification of gradually varying material properties. The method is based on the digital image correlation and finite element model updating techniques. The radial distribution of the elastic modulus of bamboo was obtained through only one four-point bending test. The inversely identified modulus distribution was verified through uniaxial tensile tests on sliced bamboo strips and microscopic observation of the volume fraction distribution of its vascular bundle. The results showed that the elastic modulus of the bamboo material decreased from the outer skin (20 GPa) to the inner skin (2 GPa), which is in good consistence with the tensile test results on sliced specimens.

中文翻译:

使用四点弯曲试验对竹子模量梯度分布的逆表征

竹子作为一种天然的分级材料,其弹性模量从内到外沿径向逐渐增加。模量分布的准确测量在竹基结构设计中起着重要作用。然而,很难通过对竹片使用传统的测试方法来表征这种模量分布。本研究开发了一种更有效的方法,用于对逐渐变化的材料特性进行逆识别。该方法基于数​​字图像相关和有限元模型更新技术。竹材弹性模量的径向分布仅通过一次四点弯曲试验得到。通过对切片竹条进行单轴拉伸试验和显微镜观察其维管束的体积分数分布,验证了反向识别的模量分布。结果表明,竹材的弹性模量从外皮(20 GPa)向内皮(2 GPa)递减,与切片试样的拉伸试验结果一致。
更新日期:2021-07-04
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