@article{oai:kpu.repo.nii.ac.jp:00005173,
 author = {飯田, 生穂 and Iida, Ikuho},
 journal = {京都府立大學學術報告. 農學, The scientific reports of Kyoto Prefectural University. Agriculture},
 month = {Nov},
 note = {マイクロ波照射過程における木材繊維に直角方向(半径方向)の曲げクリープ, 含水率の経過を針・広葉樹13樹種について測定し, 照射過程中の乾燥速度と含水率, クリープたわみと含水率の関係を調べた。また, これらの結果を熱気乾燥による結果と比較検討し, マイクロ波照射過程のクリープ特性を考察した。得られた結果は, 以下のとおりである。1)マイクロ波照射過程における乾燥速度係数は, 樹種によって3.40(hr)^<-1>から5.65(hr)^<-1>の範囲の値で, 全樹種の平均で4.73(hr)^<-1>であった。この値は熱気乾燥の場合の平均5.3倍であり, 乾燥速度が著しく大きい。2)飽水状態で負荷を与え, マイクロ波を照射すると照射初期からクリープたわみが著しく増大する。3)飽水状態からほぼ全乾燥状態まで乾燥したときの最大クリープたわみymと飽水状態から平均含水率30%までに生じたクリープたわみy_<30>の比(y_<30>/y_m)は, 各樹種で負荷した応力の程度によらない一定の値で, イチョウ材の場合, 約0.73,ブナ材の場合, 約0.44を示し, 樹種によって異なるが, 比重や樹種グループによる相違はみられなかった。この値は全樹種の平均で0.60であった。以上の結果より, マイクロ波照射による材の乾燥速度は著しく大きく, クリープたわみは平均含水率30%以上で全クリープたわみの1/2以上を生じていることがわかった。従って, この高含水率領域のクリープ挙動が, マイクロ波による場合の木材変形の大きな特徴である。, Bending creep tests in the radial direction perpendicular to the grain were carried out on the thirteen different wood species during the microwave irradiation and during the hot-air drying. The course of moisture content of specimen during creep tests were measured at the same time. And then, relationships between the drying rate and the moisture content, or the creep deflection and the moisture content were investigated and disscussed. Results obtained are as follows : 1) The coefficients of drying rate (K_1) during microwave irradiation process were from values of 3.40(hr)^<-1> to 5.65(hr)^<-1> for different species. With average value of all woods, there were of 4.73(hr)^<-1>. Therefore, this value show a value of 5.3 times as much as these of hot-air drying. 2) Creep deflection of woods dried by the microwave heating increase remarkably from the start of the microwave irradiation. 3) Ratio (y_<30>/y_m) of creep deflection y_m, in region of green&acd;30% moisture content, to the maximum creep deflection y_m were thought the values differ from each wood species, in no relation with the applied stresses and these values have the constant in a wood. Those were estimated about 0.73 for Icho wood and about 0.44 for Buna wood, and moreover it was about 0.6 with average value for all wood species. Consequently, it was recognized that drying rate became remarkably magnitude value during microwave heating. Creep deflection on the 30% moisture content take beyond about half of the total creep deflection. Conseqently, the large creep deformation developed during the high moisture content process, and it constitute a caractaristic frature of microwave heating.},
 pages = {71--76},
 title = {マイクロ波照射過程における木材繊維直角方向の曲げクリープ特性(林学部門)},
 volume = {41},
 year = {1989},
 yomi = {イイダ, イクホ}
}