lecture20b - Prepared by: Ezgi Ank Arda Ergnen 20.12.2009...

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Prepared by: Ezgi Anık 20.12.2009 Arda Ergönen TENSION VERSUS COMPRESSION AND EULER BUCKLING Sometimes supporting a load in tension is more problematic and more risky than supporting the same load in compression; but this doesn’t have to be always true. With unreliable materials and with primitive joints, for example, tension can cause catastrophic results. However, in modern technology as well as in nature, a tension structure is often the lightest, cheapest, and safest solution. Some compressive constructions, despite of being simple and fairly reliable, such as masonry, they are heavy and consume a lot of labour. Nature does not offer many examples of compressive structures, but anthills are a rare exception. Such a design is quite unsuitable that have characteristics of living things. The way in which materials fail under tension is much different than the way they fail under compression. Failure in tension usually occurs by a separation of the molecules at the weakest cross section of the member. With a uniform member, the length does not make any difference to the strength in tension under static loading. The behaviour of materials that fail under compression depends on their length. A low wall of bricks, a short material strut, or a short bone may remain straight and stable under the load until the material finally fails because of a local crushing mechanism. A longer strut or a higher wall is liable
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lecture20b - Prepared by: Ezgi Ank Arda Ergnen 20.12.2009...

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