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首页> 外文期刊>Wood and Fiber Science >Fracture toughness of wood and wood composites during crack propagation.
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Fracture toughness of wood and wood composites during crack propagation.

机译：裂纹扩展过程中木材和木材复合材料的断裂韧性。

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摘要

Mode I fracture toughness as a function of crack length of medium-density fiberboard (MDF), particleboard (PB), and Douglas-fir (DF) was measured using a new energy-based method. PB and MDF are examples of composites that develop fiber bridging during crack propagation, which causes their toughness to increase with crack length. Longitudinal cracks in DF also displayed fiber-bridging behavior, but only when the crack plane was normal to the tangential direction. MDF and PB experiments were performed for both in-plane and out-of-plane cracks. The toughness of the former was much higher than the latter. The in-plane crack toughness of MDF was higher than PB, but its out-of-plane toughness was lower. PB made using a new soy-based resin had an in-plane toughness similar to commercial PB but an out-of-plane toughness three times higher. Out-of-plane crack propagation is suggested as an improved method for measuring internal bond (IB) properties. When the fracture method was compared with conventional IB tests, both methods showed that the soy PB was better but the fracture method provided a clearer distinction.
机译：使用新的基于能量的方法测量了I型断裂韧性与中密度纤维板（MDF），刨花板（PB）和道格拉斯冷杉（DF）裂纹长度的关系。 PB和MDF是复合材料的示例，这些复合材料在裂纹扩展过程中会形成纤维桥接，从而导致其韧性随裂纹长度的增加而增加。 DF中的纵向裂纹也显示出纤维桥接行为，但仅当裂纹平面垂直于切线方向时才如此。对面内和面外裂纹均进行了MDF和PB实验。前者的韧性比后者高得多。 MDF的面内裂纹韧性高于PB，但面外韧性较低。使用新型大豆基树脂制成的PB具有与商用PB相似的面内韧性，但其面外韧性高出三倍。提出面外裂纹扩展是一种用于测量内部键合（IB）性能的改进方法。当将断裂方法与常规IB试验进行比较时，两种方法均表明大豆PB更好，但断裂方法提供了更清晰的区别。

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