hull girder failure under combined global and local loads stykuc.pdf · 2017-02-23 · fe...
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![Page 1: Hull girder failure under combined global and local loads Stykuc.pdf · 2017-02-23 · FE progressive collapse analysis of bulk carrier and of container ship 2. Camparison with Poseidon](https://reader034.vdocuments.us/reader034/viewer/2022043003/5f80f17722010b7d69266808/html5/thumbnails/1.jpg)
1 University of Rostock | Naval Architecture and Ocean Engineering February 2013 University of Rostock | Naval Architecture and Ocean Engineering
Hull girder failure under combined global and local loads
Author: Patrick Stykuc
![Page 2: Hull girder failure under combined global and local loads Stykuc.pdf · 2017-02-23 · FE progressive collapse analysis of bulk carrier and of container ship 2. Camparison with Poseidon](https://reader034.vdocuments.us/reader034/viewer/2022043003/5f80f17722010b7d69266808/html5/thumbnails/2.jpg)
2 University of Rostock | Naval Architecture and Ocean Engineering February 2013
Presentation contents
1. Subject of the thesis
2. Analysed ships
3. Methodology
4. Bulk carrier – Finite element model
5. Bulk carrier – Alternate loading condition
6. Container ship - Finite element model
7. Conclusions
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3 University of Rostock | Naval Architecture and Ocean Engineering February 2013
Subject of the thesis
1. FE progressive collapse analysis of bulk carrier and of container ship
2. Camparison with Poseidon software that uses Smith’s method
3. Influence of the local loads
![Page 4: Hull girder failure under combined global and local loads Stykuc.pdf · 2017-02-23 · FE progressive collapse analysis of bulk carrier and of container ship 2. Camparison with Poseidon](https://reader034.vdocuments.us/reader034/viewer/2022043003/5f80f17722010b7d69266808/html5/thumbnails/4.jpg)
4 University of Rostock | Naval Architecture and Ocean Engineering February 2013
Capesize bulk carrier
Lpp = 280,8 m app. 170 000 dtw
Fig. 1 Example of the bulk carrier model given in the GL - Poseidon
![Page 5: Hull girder failure under combined global and local loads Stykuc.pdf · 2017-02-23 · FE progressive collapse analysis of bulk carrier and of container ship 2. Camparison with Poseidon](https://reader034.vdocuments.us/reader034/viewer/2022043003/5f80f17722010b7d69266808/html5/thumbnails/5.jpg)
5 University of Rostock | Naval Architecture and Ocean Engineering February 2013
Container ship
Lpp = 349,5 m app. 14 000 teu
Fig. 2 Example of the container ship model given in the GL - Poseidon
![Page 6: Hull girder failure under combined global and local loads Stykuc.pdf · 2017-02-23 · FE progressive collapse analysis of bulk carrier and of container ship 2. Camparison with Poseidon](https://reader034.vdocuments.us/reader034/viewer/2022043003/5f80f17722010b7d69266808/html5/thumbnails/6.jpg)
6 University of Rostock | Naval Architecture and Ocean Engineering February 2013
Methodology
Progressive collapse
1. Applying curvature
2. Calculating strain in the elements
3. Calculating stresses
4. Change of the neutral axis
5. Moment acting
6. If Mu not reached repeat the steps with increased curvature
Fig. 3 Stress – strain curve
![Page 7: Hull girder failure under combined global and local loads Stykuc.pdf · 2017-02-23 · FE progressive collapse analysis of bulk carrier and of container ship 2. Camparison with Poseidon](https://reader034.vdocuments.us/reader034/viewer/2022043003/5f80f17722010b7d69266808/html5/thumbnails/7.jpg)
7 University of Rostock | Naval Architecture and Ocean Engineering February 2013
Bulk carrier – Finite element model
Build in Ansys Workbench 3 cargo holds, Fr.109 -196
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8 University of Rostock | Naval Architecture and Ocean Engineering February 2013
Methodology
![Page 9: Hull girder failure under combined global and local loads Stykuc.pdf · 2017-02-23 · FE progressive collapse analysis of bulk carrier and of container ship 2. Camparison with Poseidon](https://reader034.vdocuments.us/reader034/viewer/2022043003/5f80f17722010b7d69266808/html5/thumbnails/9.jpg)
9 University of Rostock | Naval Architecture and Ocean Engineering February 2013
Mesh convergence
Mesh 1 – 350 mm
Mesh 2 – 300 mm
Mesh 3 – 140 mm
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10 University of Rostock | Naval Architecture and Ocean Engineering February 2013
Mesh convergence - results
Ultimate strength
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11 University of Rostock | Naval Architecture and Ocean Engineering February 2013
Imperfections
Around 3 mm for plating thickness 18,0 mm
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12 University of Rostock | Naval Architecture and Ocean Engineering February 2013
Ultimate strength – Model with imperfections
![Page 13: Hull girder failure under combined global and local loads Stykuc.pdf · 2017-02-23 · FE progressive collapse analysis of bulk carrier and of container ship 2. Camparison with Poseidon](https://reader034.vdocuments.us/reader034/viewer/2022043003/5f80f17722010b7d69266808/html5/thumbnails/13.jpg)
13 University of Rostock | Naval Architecture and Ocean Engineering February 2013
Plastic strain in girders for Point 1 Plastic strain in girders for Point 2
Plastic strain bottom plating after Point 1 Plastic strain in bottom plating for Point 2
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14 University of Rostock | Naval Architecture and Ocean Engineering February 2013
Comparing results
Ultimate strength
![Page 15: Hull girder failure under combined global and local loads Stykuc.pdf · 2017-02-23 · FE progressive collapse analysis of bulk carrier and of container ship 2. Camparison with Poseidon](https://reader034.vdocuments.us/reader034/viewer/2022043003/5f80f17722010b7d69266808/html5/thumbnails/15.jpg)
15 University of Rostock | Naval Architecture and Ocean Engineering February 2013
Bulk carrier - Poseidon model
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16 University of Rostock | Naval Architecture and Ocean Engineering February 2013
Comparison FE analysis - Poseidon
FEM Mu = 21180 [MNm] Poseidon Mu = 20670 [MNm]
2,4% Higher Mu for FEM
Ultimate strength
![Page 17: Hull girder failure under combined global and local loads Stykuc.pdf · 2017-02-23 · FE progressive collapse analysis of bulk carrier and of container ship 2. Camparison with Poseidon](https://reader034.vdocuments.us/reader034/viewer/2022043003/5f80f17722010b7d69266808/html5/thumbnails/17.jpg)
17 University of Rostock | Naval Architecture and Ocean Engineering February 2013
Local loads
Load case 1: Wave height 13 meters,
Load case 2: Wave height 15 meters,
Load case 3: Wave height 20 meters,
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18 University of Rostock | Naval Architecture and Ocean Engineering February 2013
Ultimate strength 20 meters wave height
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19 University of Rostock | Naval Architecture and Ocean Engineering February 2013
20 meters wave - results
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20 University of Rostock | Naval Architecture and Ocean Engineering February 2013
Container ship – FE model
Initial container ship model
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21 University of Rostock | Naval Architecture and Ocean Engineering February 2013
Comparison FE analysis - Poseidon
FEM Mu = 27710 [MNm] Poseidon Mu = 27210 [MNm]
1,8% Higher Mu for FEM
Ultimate strength
![Page 22: Hull girder failure under combined global and local loads Stykuc.pdf · 2017-02-23 · FE progressive collapse analysis of bulk carrier and of container ship 2. Camparison with Poseidon](https://reader034.vdocuments.us/reader034/viewer/2022043003/5f80f17722010b7d69266808/html5/thumbnails/22.jpg)
22 University of Rostock | Naval Architecture and Ocean Engineering February 2013
Conclusions
Progressive collapse on two FE models were performed
Smith’s method and results from FEA are comparable
Bottom bending effects decrease ship’s ultimate strength
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23 University of Rostock | Naval Architecture and Ocean Engineering February 2013