(35) 木材の匍匐と含水率との關係に就て
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概要
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A concentrated load was added on uniform cantilever of Hinoki (Chamaecyparis obtusa Sieb. et Zucc.) and subseqent change of slope at free end was measured by simple optical system. Let t be the time after a load is added, θ(t) be the change of slope at the time t. Then, θ(o) may be considered as the part corresponding to elastic deformtion and θ(t)-θ(o) as creep. In this study, the modulus of elasticity E=WL^2/2I・tanθ(o)-W is a load, L the beam length and I the moment of inertia of cross section-and the creep degree α(t)=[θ(t)-θ(o)]/θ(o) was determined for various moisture-contents with test specimens in which moisture distributes equally.The test result shows that α(t) can be split into two factors as follows, α(t)=α(t^*)・f(t)where α(t^*) means creep degree at a certain time t, f(t) is a function depending on the time t only. For example, in the case of t^*= 4 min., we get almost exactly a same function f(t) irrespectively of the value α(4 min.) as shown in table I and fig.I. Fig.2 shows plots of Young's modulus vs. moisture-content and α(4 min.) vs. moisture-content for the stress of 270 kg/cm^2. In another moisture conditions, i.e., the case of absorbing process, drying process which cause moisture movement in wood, creep and elasticity are extremely different from those of steady state above mentioned. Creep for other stresses and in such different moisture conditions will be reported by the author in other paper.
- 日本森林学会の論文
- 1949-08-30
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