By David McDowall
This full-colour research of latest Britain examines features of British society from govt and politics, to tradition and magnificence.
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And CHAPMAN, L. B. Principals of Naval Architecture, Volumes 1 and 2, The Society of Naval Architects and Marine Engineers, New York, 1939. 2. DRUCKER, D. C. "Plastic Design Methods—Advantages and Limitations" Trans, Soc. Naval Architects and Marine Engineers, 1957. 3. BLEICH, F. Buckling Strength of Metal Structures, McGraw-Hill, New York, 1952. 4. FRANKLAND, J. M. "The Strength of Ship Plating Under Edge Compression", David Taylor Model Basin Report No. 469, May, 1940. 5. VASTA, J. "Lessons Learned From Full Scale Ship Structural Tests" Trans.
The actual scale factors for realistic structures amount to 1/2 to 1/6. Naturally it is important to employ, for model and prototype, materials which have the same stress-strain curves. The linear scaling leads to a linear reduction of the dimensions of the explosive charge and of the standoff from the attack. It further means that collapse pressures and velocities in prototype and model are equal and that the time scale is reduced linearly for the model. Extensive model test work has proved again and again that the plastic deformation of such models presents a true picture of the prototype both in damage pattern and in a total degree of damage.
It is probably not widely known that such tests lead to dependable results of the response for static loads. And it is probably less well known that the dynamic performance of ship structures far into the plastic range, resulting from explosion or impact attack, 28 A. H. KEIL can be reproduced exceptionally well with realistic models under properly simulated or scaled loading conditions. It is not the purpose of this presentation to elaborate on the scaling laws, so only the technique will be mentioned.