Compressive Plastic Working of Woody Materials

木质材料的压缩塑性加工

• 批准号: 07455293
• 负责人: NISHIMURA Hisashi
• 金额: $ 4.93万
• 依托单位: TOKYO METROPOLITAN UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07455293/
• 关键词: Woody Material; Compressud Wood; Lumber; Strength of Wood; Wood Working; Plastic Working; Compressive Working

1.Development of a compressive plastic working device for wood materials.The working device consists of 1), plasticization device, 2), press device, 3), form fixation device. These devices where bought in 1995 and are working without major problems at the present time. The research done with the device were on compressing square timbers of Japanese cedar to one third of its original volume after heating the material in boiled water. To fix the form we used a method of sealing the both ends of the material before heating it to 180Cﾟ.2.Strength evaluation of compressed wood materials.We evaluate the strength of the compressed cedar, deformed with the mentioned device, trough tensile and bend test. The bending strength came out to be proportionately with the compression rate, which the one-third compressed wood showed 2.5 times stronger than the uncompressed one. The reason that the strength of the compressed material did not show 3 times was because the fibers of the material were destro … More yed at the compressive working. Figuring out that the compressed wood's specific strength is 2 times larger than that of the Aluminum and 4 times larger than that of the steel, we can consider that compressed woods are worthy of use as lightweight construction material.3.Form restoration expeiment.We made experiment of the form restoration of the compressed wood material, which the form fixed material restored its form by being reheated with substances like boiled water. The experiment was done 10 times by putting the compressed material into boiled water at 100 Cﾟ for 10 minutes and taking out from it. The results showed that for higher compressing rate, lower restoration rate could be got.4.Optimization of the heating/cooling curve at form fixing process.For form fixing of a compressed wood, it has to be heated at 180Cﾟ, at a pressure of 10-atms for 10 minutes and then cooled. We could know that the cooling curve affects the form fixing performance.5.Size effect at compressed wood production.We compared the size effect between small test fragments used at laboratory experiment level and large test fragments with length up to 2 meters. The results showed no basic differences between the results of the experiment done with the small experiment fragment and actual productive size. Less

1.研制了一种木材压缩塑性加工装置，该装置由塑化装置、加压装置、定型装置组成。这些设备是1995年购买的，目前正在工作，没有重大问题。用该设备进行的研究是将日本雪松的方形木材在沸水中加热后压缩到原始体积的三分之一。为了固定模板，我们使用了在将材料加热到180 ℃之前密封材料两端的方法。2.压缩木材材料的强度评估我们评估了压缩雪松的强度，用上述装置变形，通过拉伸和弯曲试验。抗弯强度与压缩率成正比，三分之一压缩木材的抗弯强度是未压缩木材的2.5倍。压缩后材料的强度未达到3倍的原因是材料的纤维被破坏， ...更多信息 在压缩工作。压缩木材的比强度比铝高2倍，比钢高4倍，是一种值得推广的轻质建筑材料。3.形状恢复实验：对压缩木材进行形状恢复实验，即用开水等物质对固定材料进行加热，使其恢复形状。实验结果表明：压缩率越高，恢复率越低; 4.定型过程中加热/冷却曲线的优化：压缩木材定型时，必须在180 ℃左右加热，在10个大气压下加热10分钟，然后冷却。5.压缩木生产中的尺寸效应我们比较了实验室试验水平上使用的小测试碎片和长达2 m的大测试碎片的尺寸效应。结果表明，用小实验块所做的实验结果与实际生产规模没有基本差异。少

项目成果

西村 尚: "圧縮塑性加工した木材の破壊現象" 日本機械学会関西支部講演会論文集No.964-1. 366-367 (1996)

Takashi Nishimura：“压缩塑性加工木材的断裂现象”日本机械工程学会关西分会论文集第 964-1 号（1996 年）。

西村 尚: "圧縮塑性加工した木材の強度" 日本機械学会材料力学部門講演会No.95-2. 111-112 (1995)

Takashi Nishimura：“压缩塑性加工木材的强度”日本机械工程师学会材料力学分部讲座第 111-112 号（1995 年）。

NISHIMURA,HISASHI: "Plastic Working of Lumber" SOKEIZAI. Vol.37.No.10. 1-7 (1996)

西村久：“木材的塑性加工”SOKEIZAI。

西村,尚: "圧縮塑性加工した木材の強度" 日本機械学会材料力学部門講演会論文集 No95-2. 111-112 (1995)

Nishimura, Takashi：“压缩塑性加工木材的强度”日本机械工程学会材料力学分会论文集第 95-2 号（1995 年）。

NISHIMURA,HISASHI: "Fracture Behavior of Compressed Wood" Proc.1996 Ann.Met.JSME KANSAI. No.964-1. 366-367 (1996)

NISHIMURA,HISASHI：“压缩木材的断裂行为”Proc.1996 Ann.Met.JSME KANSAI。