On the design of aluminium crane girder
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概要
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In Japan there have been workedout a few plans of aluminium-made crane.When I checked some reports on its design process already published or not yet public, I who have been making researches in the airplane design field, found some incomprehensible points.Now I want to make clear these points in this paper.First, I want to point out that an aluminum alloy structure, when compressed, will be in danger of buckling before reaches its elastic limit. Therefore it is important to find out this buckling stress . For the buckling stress of the box-style girder due to bending, I applied S. Timoshenko's famous formula of the rectangular plate in compression. I adopted the material affected by welding, and drew the stress-strain curve, from which I workedout the tangent modulus curve under the consideration that the required stress is beyond the proportional limit.Next, I made a comparison between my buckling stress and the compressive unit stress for top flange from the Table VII of the paper, "A Review of Aluminum Crane "by A . H. Koept, and calculated backward the factor of safety to be 2.4 in the reasonable range of b/t.Moreover, for the shearing force on the webplate of the box girder due to bending, I reckoned its maximum value by the formula of shear buckling.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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