The mode I critical stress intensity factor of a Scots pine beam was studied in the tangential-radial crack propagation system. The beam was naturally dried in the lab enviroment following a year and a half-long exposure to the harsh climate of Trondheim in Norway. A comparison between critical stress intensity factor values obtained by means of experimental and theoretical approaches were made. Finite Element analysis along with the critical stress intensity factor tests were carried out to identify the values in the former datasets, while to create the latter datasets, a modified relation, on the basis of The ASTM 399–20 Standard, was propsed. The values in the above mentioned datasets, were in close correspondence together. Furthermore, the moisture content within the radial and longitudinal directions of the beam using the relative humidity and response time of the samples was studied. Finally, the relation between the moisture content and the critical stress intensity factor along the length of the beam was investigated and compared with the reported data in the literature. It was found that the pre-experimental conditioning of the wood and crack directionality system had a considerable impact on the values of critical stress intensity factor.

在切向径向裂纹扩展系统中研究了Scots松木梁的I型临界应力强度因子。在挪威特隆赫姆的恶劣气候下半年半暴露之后，光束在实验室环境中自然干燥。对通过实验和理论方法获得的临界应力强度因子值进行了比较。进行了有限元分析以及临界应力强度因子测试，以识别前一个数据集中的值，同时为了创建后一个数据集，提出了基于ASTM 399-20标准的修改关系。上述数据集中的值彼此紧密对应。此外，利用样品的相对湿度和响应时间研究了光束在径向和纵向上的水分含量。最后，研究了沿横梁长度方向的水分含量与临界应力强度因子之间的关系，并将其与文献报道的数据进行了比较。研究发现，木材的实验前条件和裂纹定向系统对临界应力强度因子的值有相当大的影响。