巻号一覧
後続誌
20 巻 (1958 - 1959)
- 4 号 p. 137-
- 3 号 p. 101-
- 2 号 p. 49-
- 1 号 p. 1-
20 巻, 3 号
選択された号の論文の10件中1～10を表示しています
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高速3軸圧縮試験川村 登, 梅田 重夫1958 年 20 巻 3 号 p. 101-103
発行日: 1958/12/30
公開日: 2010/04/30
ジャーナル フリーIn previous paper, we found that the fracture strength of soil under the dynamic load increased with logarithm of the loading speed v, and that the fracture of soil was due to the shearing stress and the limit-equilibrium formula τ=σ⋅tanφ+c was valid at high speed. In this paper, we report the results of the high speed tri-axial compression test of soil, applying the side pressure σ3 and measuring the normal compression stress σ1.
(1) The fracture phenomenon are same to uniaxial compression test and are due to the shearing stress. (2) The fracture stress σ1 increases with log v until the critical velocity decreases with the increase of side pressureσ3. (3) With using the Mohr' circle (Fig. 3), we determine the cohesion c and the angle of internal friction φ, and with this result c mainly increases with the velocity v and φ slightly increases or oppositly decreases with v (Fig. 4)抄録全体を表示PDF形式でダウンロード (1951K) -
1958 年 20 巻 3 号 p. 103
発行日: 1958/12/30
公開日: 2010/04/30
ジャーナル フリーPDF形式でダウンロード (167K) -
車輪のラグによる土の変形と応力について (1)田中 孝1958 年 20 巻 3 号 p. 104-108
発行日: 1958/12/30
公開日: 2010/04/30
ジャーナル フリーThe Soils used in this test are pulverized clay, the coefficient of internal resistance tanφ=0.74 φ=36°30′ and cohesion c=0.328kg/cm2, and sandy' loam, the moisture contents are nearly 29% (w. b.), In these soils the farm wheel that has the lug which has 4 different angle is driven by the power. On this test the soil and wheel shaft are both fixed, then the slip percentage of it to the soil are all 100%.
The results are follows.
(1) It is confirmed that the sliding shear planes spring up in two directions which have the angle ±(π/4-φ/2) against the maximum principal stress.
(2) The primary shear plane of them formed the triangle with the wheel surface and that lug.
(3) As the area of that triangle increases with the wheel rotation, it is found that the direction of the principal stress is not followed the angle of lug.
(4) As this part works as the rigid body, they are considered as the one part of the wheel.
(5) Then, at first, the direction of the principal stress are effected by the lug angle,
(6) but, after that, it is not effected.
(7) Rather, it is effected by the sinking degree and slip percentage of the wheel.
(8) After, when the primary shear plane arrives to the soil surface, the resistance of the soil decreases immediately as fig. 6.
(9) The time of that is when the lug comes to the point before 20 degree from the vertical center line of wheel.
(10) As the coefficient of internal resistance and shearing resistance are small in the moistened soil by the great deal of water, the soil reaction force is small.
(11) The calculation of stress and the reaction force to the lug are described in IV, but the results of that will be published in next paper.抄録全体を表示PDF形式でダウンロード (2693K) -
冬季乾燥時における土壌構造が土壌面蒸発に及ぼす影響について田原 虎次, 藍 房和1958 年 20 巻 3 号 p. 109-112
発行日: 1958/12/30
公開日: 2010/04/30
ジャーナル フリーThe results of investigation are summarized as follows.
(1) Soil structure exerts influence upon evaporation, especially when the soils wet to the extent of field moisture capacity. But when the soil is too wet, it does not exert much influence.
(2) There are different aspects to the evaporation of soil structure where there is a layer of discontinuity between the uper soil the layer and the lower soil layer, and where there is not.
(3) The soil structure that has the layer of discontinuity controls the evaporation, but the soil structure that has not hasten, remarkably when the soil structure that holds the aproxmate field moisture capacity.
(4) For research into the theory of cultivator, we must ascertain above disposition by the practical experiment in the field after this.抄録全体を表示PDF形式でダウンロード (5131K) -
佐野 交彦, 庄司 英信1958 年 20 巻 3 号 p. 113-118
発行日: 1958/12/30
公開日: 2010/04/30
ジャーナル フリーAs a partial study on the small riding tractor, authors investigated various kinds of the three wheel tractor at home and abroad. On inquiry, they understood that there are 8 kinds of three wheel type on classificatin (table 1 and fig. 2), and clarified their characteristics, scrutinizing their capacity of stability, steering and running, and some problems for all purpose use.抄録全体を表示PDF形式でダウンロード (1172K) -
粉粒状肥料の圧縮性について涌井 学1958 年 20 巻 3 号 p. 119-121
発行日: 1958/12/30
公開日: 2010/04/30
ジャーナル フリーA series of compression tests was made to analyze the performance of fertilizer in a top-delivery-type distributor. The result obtained may be summarized as follows: 1) The compressibility is chiefly affected by the average size of a particle, size distribution, shape factor and softness of fertilizer. The fertilizer tested can be classified into three groups, concerning to each compressibility. 2) The compressibility is nearly contrary to fluidity. 3) In consequence of absorption of water, fertilizer becomes easy to be compressed. This change of property is generally equivalent to the change of its softness. 4) The compressibility of mixed fertilizer is highly influenced by the property of dominant material.抄録全体を表示PDF形式でダウンロード (462K) -
刈刃の負荷特性に関する研究 (第3報, 第4報) ―往復動刃と丸のこ刃の切断速度比及び丸のこ刃の負荷特性―江崎 春雄, 奥井 和致1958 年 20 巻 3 号 p. 122-125
発行日: 1958/12/30
公開日: 2010/04/30
ジャーナル フリー1) This work aimed to determine the value of cutting speed ratio (cutting speed Vm/travel speed Vs) for reciprocating cutter bar and circular saw cutter with the use of E·O-4 type cutting tester. The results may be summarized thus:
1-1) When the height of stubble is low(65mm), the faster the travel speed, the lower the value of critical cutting speed ratio (Kr=Vm/Vs)
1-2) As for the reciprocating cutter bar, if the stubble becomes higher (within the range of 65-135mm), Kr takes lower value.
1-3) The circular saw cutter without finger or guard plate, which supports the stem of crop for cutting, does not show fine cut unless extremely high speed is given to it.
1-4) The critical cutting ratio for cutting rice crop shows lower value than that for wheat or barley. It may suggest that fine cut of rice crop is obtained with lower cutting speed.
2) We carried out some tests on load characteristics of circular saw cutter.
The results of experiments are concluded as follows:
2-1) The appropriate cutting speed is 15-20m/sec, when the travel speed is 1m/sec.
2-2) At a given cutting speed 15m/sec, the travel speed for rice can be chosen as high as 1.4m/sec, while for wheat and barley it is preferable to keep the travel speed under 1m/sec.
2-3) We investigated some kinds of circular saw and found out that 2mm pitch is preferable.
2-4) When the saw rotates clockwise or anticlockwise respectively, it seems to be favourable to cut crop with right or left end of the disc, respectively.
2-5) The circular saw should be used with some inclination to the ground lest great friction resistance should be raised between the disc and stubble.抄録全体を表示PDF形式でダウンロード (659K) -
籾殻の破壊形相と脱〓作用・脱〓装置との因果関係中村 忠次郎1958 年 20 巻 3 号 p. 126-128
発行日: 1958/12/30
公開日: 2010/04/30
ジャーナル フリーSystemanizing the mutural relation among hulling types, hulling actions and the break-down type of husks, the following are given;
Hulling type
Classification Hulling actions
Break-down form of husks
1. Mortar type{Friction action. Rub-rolling action. Wear and crack form Irregular twist and tear form.
Compression action. Cross-wide crack form.
Shearing action. Shearing longitudinal split form.
Others. Shapeless fragment form.
2. Impulsion type{Impulsion action. Original form and edge cutting form.
Friction action. Wear and crack form.
3. Roll type{Friction action. Wear and crack form. Longitudinal partion form.
Compression action. Cross-wide crack form.
Pull action. Lateral long cutting form.
Rub-rolling action. Irregular twist and tear form.
Pressing out action. Openning form.
Others. Shapeless fragments.抄録全体を表示PDF形式でダウンロード (512K) -
浅野 松夫, 可知 正夫1958 年 20 巻 3 号 p. 129-131
発行日: 1958/12/30
公開日: 2010/04/30
ジャーナル フリーSince drying method of short piece moodle has been adopted natural drought drying or low temperature drying owing to the difficulty to perform perfect drying and the tendency to deform and become brittle. Then long time has been needed for it.
We made a instrument for the aim to get perfect artificial drying of them. And found one suitable drying method and study for several characteristics of noodle.
(1) In order to get perfect drying without deformation and decrease of strength of the products, the heating and tempering must be repeated 2-4 times in the drying course.
(2) The heating temperature must be under 40°C. The suitable temperature is 20°C.
(3) The suitable moisture of the draught air is 60-70%.
On the practical manufacturing process it is acceptable that the temperature is used under 40°C and the moisture is applied 60-80%.
(4) When artificial drying is applied, we get the better quality products more than that of natural draught drying method which is customed.抄録全体を表示PDF形式でダウンロード (473K) -
主として試験研究及び製作について松田 良一1958 年 20 巻 3 号 p. 132-134
発行日: 1958/12/30
公開日: 2010/04/30
ジャーナル フリーPDF形式でダウンロード (602K)
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