Proper crack growth in the investigation of adhesive failure in bonded wood joints requires laborious grain control. By adding auxiliary adherends, this paper introduces and evaluates a novel sample geometry that enables fracture energy characterization of wood veneer-adhesive systems. The proposed method was applied to three wood species to test three commonly used wood adhesives. The proposed sample geometry successfully identified differences in fracture energies associated with the use of different adhesives on the same wood species and offered comparable success rate as grain control method. More importantly, for sawn and planed veneers that were without lathe checks common in rotary-peeled veneers, the success rate was even higher than that of rotary peeled veneers, indicating the significance of our proposed method to wood adhesion. We further explored the effects of crack propagation both parallel and perpendicular to wood grain orientation and designed wax strip specimens to understand rising R-curve behavior observed in certain species.

在粘合木接头中的粘合失效调查中，适当的裂纹扩展需要费力的纹理控制。通过添加辅助粘附体，本文介绍并评估了一种新颖的样品几何形状，该几何形状能够表征木饰面胶粘剂系统的断裂能量。将所提出的方法应用于三种木材种类以测试三种常用的木材粘合剂。所提出的样品几何形状成功地识别了与在同一木材品种上使用不同粘合剂相关的断裂能差异，并提供了与颗粒控制方法相当的成功率。更重要的是，对于旋切单板中常见的没有车床检查的锯刨单板，成功率甚至高于旋切单板，表明我们提出的方法对木材粘附的重要性。