Control of spring back for helically coiled steam generator tube
- Publisher
- Elsevier Science
- Year
- 2004
- Tongue
- English
- Weight
- 481 KB
- Volume
- 234
- Category
- Article
- ISSN
- 0029-5493
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✦ Synopsis
A study has been performed to control the amount of the spring back from tubes of the helical steam generator, which is to be installed in the integral reactor SMART. The analytical calculation was done on the basis of beam theory and elastic-perfectly plastic material property. The analysis model has considered the effect of the plastic hardening and the effect of the tensile force on the spring back phenomena. Apart from the analytical approach, finite element analysis was carried out to investigate methodological comparison and the quantitative evaluation of the spring back. Coiling process was simulated utilizing commercial finite element analysis program ABAQUS. The application of the tensile force has reduced a considerable amount of spring back. However, the application of the tensile force may cause ovality and excessive thickness reduction. From the finite element analysis based on the present design conditions, the range of the axial tensile force to be applied in order to satisfy the required criteria of the spring back phenomena, the ovality, and the thickness reduction has been suggested. As an alternative approach of reducing the amount of spring back, the stress relieving heat treatment was also studied. After the coiling of the tube, the heat treatment was simulated in finite element analysis and the effect of heat treatment on the spring back was confirmed by an experiment.