Trees are vital resources to human ecology. Many trees, wooden logs and timbers lose their quality when they degrade due to fungal decay and insect attacks. In this work, stress wave method and radiography technique are the Nondestructive Evaluation (NDE) tools employed to check the presence of the defects in an Artocarpus heterophyllus wooden log. The influence of these defects, especially, the fungal decay on wood quality is studied by introducing an artificial defect and the resulting properties obtained are evaluated using stochastic approaches. A theoretical model for the distribution of the wood properties is proposed using Radon transform and the results are compared with the path analysis of the stress wave velocities in random cross-sections of the wood. Additionally, the variability of the properties for different grain angles is calculated using Hankinson equation. Further, the results are analyzed statistically using Weibull distribution and effect size to inspect the quality and invasiveness of the defects, respectively. Results show that a reasonable prediction of the properties can be made from the analytical formulation and the Weibull modulus can be used to quantify the wood quality. Finally, the values of Weibull modulus and effect size are compared and validated for the two NDE techniques.

树木是人类生态的重要资源。许多树木、原木和木材由于真菌腐烂和昆虫侵袭而退化时会失去质量。在这项工作中，应力波法和射线照相技术是用于检查异叶果树缺陷存在的无损评估 (NDE) 工具木日志。通过引入人工缺陷来研究这些缺陷，特别是真菌腐烂对木材质量的影响，并使用随机方法评估所得特性。使用 Radon 变换提出了木材特性分布的理论模型，并将结果与​​木材随机截面中应力波速度的路径分析进行了比较。此外，使用汉金森方程计算不同晶粒角度的特性变化。此外，使用威布尔分布和效应大小对结果进行统计分析，以分别检查缺陷的质量和侵入性。结果表明，可以从分析公式中对特性进行合理的预测，并且可以使用威布尔模量来量化木材质量。最后，比较并验证了两种 NDE 技术的威布尔模量和效应大小的值。