Studies on the fracture process and morphology of fractured surface in wood and wood-based materials.

断口学研究已经在木材科学和技术的许多领域进行。来自这些领域的合作研究人员就这一主题举行了会议，并审查了各自领域中与这一主题有关的重要问题。1)木试件的机械损伤有两种基本破坏类型。一种是元件之间或木材中每个元件内部发生完全或不完全分离的破坏，另一种是元件壁发生屈曲或弯曲的破坏。每种故障类型的典型形式都在报告中进行了说明。2)软木的早期木材和晚期木材表现出不同的破坏形式。加载过程中木材含水率和温度对断裂面的破坏形式和结构有显著影响。3)不同振动方式下的反复弯曲疲劳破坏形式（单向或双向）。4)酚醛树脂胶粘剂与尿素胶粘剂的粘接效果有明显差异。5)腐烂木材的破坏形式与完好木材有显著差异。衰变的种类(例如：白腐病和褐腐病影响朽木断裂面结构。6)报告中列出了木材和木质材料断口学中使用的技术术语。

Fractographic investigations have been carried out in many fields of wood science and technology. The cooperative investigators from those fields had meetings on the subject, and examined the important problems concerned with this subject in their fields.1) Two basic types of failure are found in wood specimens mechanically damaged. One is failure in which complete or incomplete separations occur between elements or within each element in wood, the other is failure in which buckling or bending occur in the wall of elements. Typical forms of each failure type were illustrated in the report.2) Early wood and late wood in softwood showed quite different failure forms. Moisture content in wood and temperature during loading considerably affected the failure forms and structure of fractured surfaces.3) Fatigue failure forms by repeated bending depended on vibration methods(one-sided or both-sided).4) A clear difference was found between bonding with phenolic resin adhesive and that with urea.5) The failure forms of decayed wood were remarkably different from those of sound wood. The kind of decay(ex. white-rot and brown-rot) affected the structure of fractured surfaces in decayed wood.6) Technical terms used in fractography of wood and wood-based materials were listed in the report.