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KMID : 0371819970290020138
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Nuclear Engineering and Technology
1997 Volume.29 No. 2 p.138 ~ p.147
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Flare Test and Stress Analysis of Alloy 600/690 Tubes
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Kim, W.G.
Jang, J./Kuk, I.H.
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Abstract
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Korean-made alloys 600 and 690 tubes were evaluated by flare tests according to ASTM standards, and acting stresses during the test were analyzed. All the tubes, including alloys 600 and 690 tubes with various heat treatment conditions, satisfied the requirement with 30 or 35% OD expansion. Axial stresses in alloy 690 tubes were higher than those in alloy 600 ones and the gap increased gradually with flaring percentage(F.P, %). Assuming the tubes as the rigid-perfectly plastic body, a stress equation was obtained using modified Tresca´s yield criterion. Also microstructural change of the flared tubes was discussed with the acting stresses.
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