著者

上田 太郎 朝倉 健二

出版者

公益社団法人 日本材料学会

雑誌

材料試験 (ISSN:03727971)

巻号頁・発行日

vol.9, no.78, pp.192-199, 1960

---

This investigation was planned for researching the effect of the repeated stress upon the longitudinal residual stress existing in the cold drawn carbon steel wire. For the specimen, 0.65% carbon steel wires drawn with 60% and 80% reductions were used, and the diameter of these wires was 1.3mm.<BR>For the measurement of the longitudinal residual stresses existing in these fine steel wires, the present writers adopted the mechanical method and electro-magnetic method.<BR>Hunter fatigue testing machine was used in this investigation, and from S-N curves of these wires the fatigue limit stress and three stresses over the fatigue limit were chosen as the repeated stress to research the behavior of residual stress. The fatigue test specimens were taken out from the fatigue testing machine at 10<SUP>7</SUP> and 10<SUP>6</SUP> cycles for the fatigue limit stress and at the number of cycle just before the break down cycle for each stress over the fatigue limit, and then the specimens for measurement of residual stress were cut out from the middle part of these fatigue test specimens. The distributions of longitudinal residual stresses of these specimens subjected to the repeated stresses were measured and those were compared with that of the standard specimen not subjected to the repeated stress.<BR>From the results obtained by this investigation, it was made clear that if the longitudinal tensile residual stress existing in the outer part of the wire was about 20-30kg/mm<SUP>2</SUP>, the distribution of longitudinal residual stress of the cold drawn steel wire was little affected by the repeated stress under rotating bending over the fatigue limit, and that which is equal to the fatigue limit, either.

著者

岡本 保 高橋 邦夫 大澤 寛 大枝 真一 小林 智 茂庭 雅弘 松崎 洋 吉野 広孝 原田 誠 朝倉 健二 石井 弘允

出版者

一般社団法人 照明学会

雑誌

照明学会 全国大会講演論文集 平成21年度(第42回)照明学会 全国大会講演論文集

巻号頁・発行日

pp.109, 2009 (Released:2010-01-08)

---

我々はこれまでに、サンマ漁用の高効率な集魚灯としてLED集魚灯を提案してきた。これまでの研究でサンマの視感度に合わせたLED集魚灯の設計・試作を行い、実際に集魚試験も行ってその有効性を実証してきた。本研究は、この成果を発展転用して、小型イカ釣り漁船用LED集魚灯光源の開発の可能性を検討するための基礎研究である。試作したLEDパネルには発光色が白のLEDを6個、シアンのLEDを12個、計18個のLEDを使用して、横240 mm x 縦 150 mmの矩形パネル光源を試作した。サンマの最大視感度波長は510 nm程度であるが、イカ類は482 ~ 494 nm程度であり、この最大視感度波長を配慮するとともに、広い海域での利用も考慮して約100 nmの波長帯域を有するLEDパネルを試作した。また、船のローリングを考慮して±40 deg. 程度の放射角になるように設計した。今後、このLEDパネルを適宜組み合わせて小型イカ釣り漁船の船体構造に適合する形状のLED集魚灯システムを開発し、その実用性を検証する予定である。

著者

岡本 保 高橋 邦夫 大枝 真一 大澤 寛 小林 智 岡部 憲幸 吉屋 重和 原田 誠 朝倉 健二 石井 弘允

出版者

一般社団法人 照明学会

雑誌

照明学会誌 (ISSN:00192341)

巻号頁・発行日

vol.98, no.12, pp.622-625, 2014-12-01 (Released:2019-10-05)

---

In the saury fishing, incandescent lamps are usually used for a fishing light. However, there are problems of the conventional fishing lights using incandescent lamps . First, electric power consumption is large. And the incandescent lamps are very inefficient, because much infrared light is included. Furthermore, life time is short and there is a problem of a lot of heat generation. Therefore, we attempted the development of highly efficient fishing lights using LEDs for saury fishing. We designed the combination of various LEDs for a fishing light, based on the spectral luminous efficacy of a Pacific saury. We performed the saury-fishing experiments by using the LED fishing lights, and comparable catch of Pacific saury was achieved by approximately 55% electric power by using both LED poles and incandescent lamp poles. Moreover, we attempted the development of LED fishing lights for squid, and it was found that comparable catch was achieved by lower electric power than that of conventional fishing lights.