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This and the next four slides are from:
W. Fricke and R. Bronsart (Editors), Proceedings of the 18th International Ship and Offshore Structures Congress (ISSC 2012), 9-13 September 2012, Rostock, Germany, Volume 2, “Committee V.5 Naval Vessels”,
ABSTRACT: Concern for structural design methods for naval ships and submarines including uncertainties in modeling techniques. Particular attention shall be given to those aspects that characterise naval ship and submarine design such as blast loading, vulnerability analysis and others, as appropriate.
IN PARTICULAR WE ARE INTERESTED IN SECTION 6.2: Ring-Stiffened Cylinder Subject to Hydrostatic Pressure Load: This case study consisted of a round robin whereby the participants generated collapse predictions for two experimental models (Mackay and Pegg, 2010). Those models were tested under a joint project of Defence Research and Development Canada and the Netherlands Ministry of Defence that examined the effect of corrosion thinning on pressure hull strength and stability (Mackay, Smith et al., In Press). The test models are small-scale aluminium ring-stiffened cylinders, their nominal dimensions are shown in Figure 8. The two models chosen for the case study are nominally identical, except for a patch of artificial corrosion on one of the specimens that was introduced by machining away some of the shell material (Figure 9). The participants were allowed to use any method to predict the strength of the cylinders, including analytical, empirical or numerical methods, or some combination thereof. Each participant reported the predicted collapse pressure and yield pressure of each specimen, as well as predicted pressure-strain histories. The experimental results were withheld until after the participants submitted their results.
CONTENTS OF THE ENTIRE VOLUME 2:
1 General Discussion – Similarities and Differences Between Naval and Commercial Structural Design
1.1 Introduction
1.2 Some Historic Notes on Naval Structural Design
1.3 Which Differences
1.4 Similarities
1.5 Differences
1.6 Military Loads
1.7 Submarines
1.8 Relation to Rules and Regulations 1.9 ConcludingRemarks
2 Optimization of Naval Structures Using Lightweight Materials
2.1 Why Consider Lightweight Materials?
2.2 Requirements and Decision Criteria for Naval Vessels
2.3 Lightweight Materials as Means for Optimization
2.4 Further Challenges for Mitigation of Weight in Naval Vessels
2.4.1 Structural Fire Protection
2.4.2 Capital Costs vs. Lifecycle Savings
2.5 Hull Monitoring
2.6 Conclusion
3 Submarine Pressure Hull Structural Design
3.1 Introduction
3.2 Materials
3.3 Geometric Imperfections
3.4 Effect of Residual Stresses on Pressure Hull Strength
3.5 Pressure Hull Design Methodology
3.6 Application of Numerical Methods to Pressure Hull Structural Design
4 Military Loads
4.1 Under Water Weapons Effects
4.2 Asymmetric Threats
5 Residual Strength After Damage
6 Benchmark Studies
6.1 Square Plate Subject to a Blast Load
6.2 Ring-Stiffened Cylinder Subject to Hydrostatic Pressure Load
6.2.1 Measured Specimen Geometry
6.2.2 Measured Material Properties
6.2.3 Round-robin Results
7 Discussion and Conclusions
8 Recommendations
9 References
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