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Applications of SEM-servo tesing machine to wood-based materials science and technology.

SEM-伺服试验机在木质材料科学与技术中的应用

基本信息

批准号：
01440013
负责人：
TAKEMURA Tomio
金额：
$ 15.42万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1991
项目状态：
已结题

项目摘要

1. Fracture of wood under static and fatigue tests : Fracture processes of several woods and wood-based materials in tension, compression, shear, and fatigue were catched with SEM observation in realistic time. 2. Developing processes of cell stiffness and growth stresses in trees : Relationships between growth stresses and gelatinous layers (liginin contents, and microfiril angles) were clarified. Effects of external forces on growth stresses in branches were also measured and compared with FEM results. 3. Structure and utilization of rapid growth trees : Steaming as a pretreatment of green loggs were proved to be effective to decreasing of collapses and drying times of gum-trees for tropical regions. 4. Interactions of cutting factors and wood surfaces in circular saw cutting : Af, fects of angles and wearing of tooth, feed per tooth, cutting direction to the grain, and others to sawed surfaces of wood were investigated with SELI observation. 5. Fracture of bonding surfaces in wood-based materials in both static and fatigue-tests : Bearing forces of finger-jointed laminae in bending were predicted from the results of SEM observations and fracture mechanics. 6. Aggregated morphology of functional compoundpolymers : Oligosaccharide-substituted styrene monomers were plymerized by radiation, and microspheres with diameters 0.6 to 1.3 mu m were found in solution. 7. Hygroscopic behaviours of finished wood : Hygroscopic (commercial products : Ketsuronain), urethane, and amino-alkyd resin coatings were exposed to accelerated weathering procedures up to 100 hours. Hygroscopic coating showed similar behaviours to those of no coating or urethane coating.

1.木材在静态和疲劳试验下的断裂：通过SEM观察实时捕捉几种木材和木质材料在拉伸、压缩、剪切和疲劳下的断裂过程。 2. 树木细胞硬度和生长应力的发展过程：阐明了生长应力和凝胶层（木质素含量和微纤维角度）之间的关系。还测量了外力对树枝生长应力的影响，并与有限元结果进行比较。 3. 快速生长树的结构和利用：事实证明，蒸煮作为绿色原木的预处理可有效减少热带地区橡胶树的倒塌和干燥时间。 4. 圆锯切割中切削因素与木材表面的相互作用：通过 SELI 观察研究了 Af、角度和齿磨损、每齿进给量、切削方向等对木材锯切表面的影响。 5. 静态和疲劳试验中木质材料粘合表面的断裂：根据SEM观察和断裂力学的结果预测指接薄板弯曲时的承载力。 6.功能化合物聚合物的聚集形态：低聚糖取代的苯乙烯单体通过辐射聚合，在溶液中发现直径0.6至1.3μm的微球。 7.成品木材的吸湿行为：吸湿性（商业产品：Ketsuronain）、聚氨酯和氨基醇酸树脂涂料暴露于加速风化程序长达100小时。吸湿涂层表现出与无涂层或聚氨酯涂层相似的行为。