Stiffener Design to Maintain Line Heating Efficiency during the Lifting Process Considering Phase Transformation
In the shipbuilding industry, welding is the main technique used to join steel structures. There is a lifting process, post-welding, that can eliminate the correction effect of line heating. Line heating is reperformed after the lifting process. This can significantly delay the ship assembly process...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-12-01
|
| Series: | Materials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1944/15/1/119 |
| _version_ | 1797498572152766464 |
|---|---|
| author | Hong-Jun Noh Hun-Bong Lim Hee-Chan Yoon Young-Hwan Han Hyun-Ik Yang |
| author_facet | Hong-Jun Noh Hun-Bong Lim Hee-Chan Yoon Young-Hwan Han Hyun-Ik Yang |
| author_sort | Hong-Jun Noh |
| collection | DOAJ |
| description | In the shipbuilding industry, welding is the main technique used to join steel structures. There is a lifting process, post-welding, that can eliminate the correction effect of line heating. Line heating is reperformed after the lifting process. This can significantly delay the ship assembly process. Herein, we present a design method for installing a permanent stiffener to avoid the disappearance of the line heating effect during the lifting process. The change in physical properties due to heating and cooling of the line heating is calculated. The limiting stress, at which the effect of the line heating completely disappears, based on the inherent strain theory, is obtained. The phase fraction by the cooling rate is calculated using the continuous cooling transformation diagram and the Kiustinen–Marburgerm equation. Physical properties affected by the phase transformation are calculated, considering the physical properties and fraction of each phase. The square plate theory and superposition principle are used to construct a local model, with a stiffener, of the ship block. The stress caused by the shape of the stiffener and the distance between the stiffeners were calculated for the local model. The calculated stress and the limiting stress were compared to determine, for the expected line heating efficiency, the most acceptable stiffener design. Finally, to confirm the elimination of the problem, the designed stiffener is analyzed using the finite element method. |
| first_indexed | 2024-03-10T03:35:14Z |
| format | Article |
| id | doaj.art-f145ed21421a4969bc84db8a10db2cbd |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T03:35:14Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-f145ed21421a4969bc84db8a10db2cbd2023-11-23T11:48:19ZengMDPI AGMaterials1996-19442021-12-0115111910.3390/ma15010119Stiffener Design to Maintain Line Heating Efficiency during the Lifting Process Considering Phase TransformationHong-Jun Noh0Hun-Bong Lim1Hee-Chan Yoon2Young-Hwan Han3Hyun-Ik Yang4Department of Mechanical Engineering, Hanyang University, 55, Hanyangdaehak-ro, Sangnok-gu, Ansan 15588, KoreaDepartment of Mechanical Design Engineering, Myongji College, 134, Gajwa-ro, Seodaemun-gu, Seoul 03656, KoreaDepartment of Mechanical Engineering, Hanyang University, 55, Hanyangdaehak-ro, Sangnok-gu, Ansan 15588, KoreaDepartment of Mechanical Engineering, Hanyang University, 55, Hanyangdaehak-ro, Sangnok-gu, Ansan 15588, KoreaDepartment of Mechanical Engineering, Hanyang University, 55, Hanyangdaehak-ro, Sangnok-gu, Ansan 15588, KoreaIn the shipbuilding industry, welding is the main technique used to join steel structures. There is a lifting process, post-welding, that can eliminate the correction effect of line heating. Line heating is reperformed after the lifting process. This can significantly delay the ship assembly process. Herein, we present a design method for installing a permanent stiffener to avoid the disappearance of the line heating effect during the lifting process. The change in physical properties due to heating and cooling of the line heating is calculated. The limiting stress, at which the effect of the line heating completely disappears, based on the inherent strain theory, is obtained. The phase fraction by the cooling rate is calculated using the continuous cooling transformation diagram and the Kiustinen–Marburgerm equation. Physical properties affected by the phase transformation are calculated, considering the physical properties and fraction of each phase. The square plate theory and superposition principle are used to construct a local model, with a stiffener, of the ship block. The stress caused by the shape of the stiffener and the distance between the stiffeners were calculated for the local model. The calculated stress and the limiting stress were compared to determine, for the expected line heating efficiency, the most acceptable stiffener design. Finally, to confirm the elimination of the problem, the designed stiffener is analyzed using the finite element method.https://www.mdpi.com/1996-1944/15/1/119equivalent thermal strain methodline heatingliftinginherent strain |
| spellingShingle | Hong-Jun Noh Hun-Bong Lim Hee-Chan Yoon Young-Hwan Han Hyun-Ik Yang Stiffener Design to Maintain Line Heating Efficiency during the Lifting Process Considering Phase Transformation Materials equivalent thermal strain method line heating lifting inherent strain |
| title | Stiffener Design to Maintain Line Heating Efficiency during the Lifting Process Considering Phase Transformation |
| title_full | Stiffener Design to Maintain Line Heating Efficiency during the Lifting Process Considering Phase Transformation |
| title_fullStr | Stiffener Design to Maintain Line Heating Efficiency during the Lifting Process Considering Phase Transformation |
| title_full_unstemmed | Stiffener Design to Maintain Line Heating Efficiency during the Lifting Process Considering Phase Transformation |
| title_short | Stiffener Design to Maintain Line Heating Efficiency during the Lifting Process Considering Phase Transformation |
| title_sort | stiffener design to maintain line heating efficiency during the lifting process considering phase transformation |
| topic | equivalent thermal strain method line heating lifting inherent strain |
| url | https://www.mdpi.com/1996-1944/15/1/119 |
| work_keys_str_mv | AT hongjunnoh stiffenerdesigntomaintainlineheatingefficiencyduringtheliftingprocessconsideringphasetransformation AT hunbonglim stiffenerdesigntomaintainlineheatingefficiencyduringtheliftingprocessconsideringphasetransformation AT heechanyoon stiffenerdesigntomaintainlineheatingefficiencyduringtheliftingprocessconsideringphasetransformation AT younghwanhan stiffenerdesigntomaintainlineheatingefficiencyduringtheliftingprocessconsideringphasetransformation AT hyunikyang stiffenerdesigntomaintainlineheatingefficiencyduringtheliftingprocessconsideringphasetransformation |