アルミニウム円管の座屈挙動に及ぼす加工硬化の影響

概要

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The effect of work-hardening on the buckling behavior of aluminum pipes (A1070 and A5056) was investigated. The compressive specimens were cut off to 12mm in height(h) and annealed some temperatures between 250℃ and 400℃ and the compression tests were carried out. Next, the specimens were cut off to 30, 60, 90, 120, 150, 200, 250 and 300mm in length(l) for the buckling tests. After the buckling specimens were annealed at temperatures(T) of a middle annealed specimen and a perfectly annealed specimen decided from data obtained by the compression tests, they were provided to the buckling tests. The experimental results are summarized as follows: The compressive yield stresses decreased sharply around the annealing temperature of 350℃ in A1070 and of 300℃ in A5056 and perfectly annealed specimens were obtained more than the temperatures. Some correction formulas involving the effect of work-hardening about Euler's formula for long column were suggested and the buckling stress calculated from formula(1) coincided well with the experiment data in case of more than 100 in equivalent slenderness ratio for A1070 and in case of about 80 to 150 for A5056.
2004-03-01