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Fracture resistance curves of wood in the longitudinal direction using digital image correlation technique
Theoretical and Applied Fracture Mechanics ( IF 5.3 ) Pub Date : 2021-05-20 , DOI: 10.1016/j.tafmec.2021.102997
Ying Yu , Ruixue Xin , Weihang Zeng , Wen Liu

This paper studies the fracture characteristics of wood in the longitudinal direction by combining KR curves and GR curve for fracture resistance ability analysis. Three-point-bending fracture test is carried out on the notched specimens. Digital image correlation (DIC) technique is applied to obtain the crack opening displacement and then calculate the equivalent crack length according to the double K fracture criterion. The KR and GR curves are constructed based on the experiment. The results show that the fracture toughness becomes larger but the fracture energy gets smaller with the increase of notch-to-depth ratio. Both the two curves show that the crack resistance ability is approximately improved when the notch-to-depth ratio increases. Through comparing KR and GR curves of the same specimen, it is seen that although these two kinds of fracture resistance curves have different evolution shapes, they both have three stages with the same dividing points, and they both can be used to analyze the quasi-brittle fracture process of wood.



中文翻译:

使用数字图像相关技术的木材纵向抗断裂强度曲线

本文通过结合K R曲线和G R曲线研究木材在纵向的断裂特性,以进行抗断裂性能分析。对缺口试样进行三点弯曲断裂试验。应用数字图像相关(DIC)技术获得裂纹开口位移,然后根据双K断裂准则计算等效裂纹长度。的ķ - [RG ^ ř根据实验绘制曲线。结果表明,随着缺口深度比的增加,断裂韧性增大,但断裂能减小。两条曲线均表明,当切口深度比增加时,抗裂能力会得到大约改善。通过比较同一试样的K RG R曲线,可以看出尽管这两种抗断裂曲线具有不同的演化形状,但它们都具有三个具有相同分界点的阶段,并且它们都可以用于分析断裂强度。木材的准脆性断裂过程。

更新日期:2021-05-27
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