Xu, He, Guedes Soares, C. and Zhu, L. (2020), “Scaling the saturated impulse behaviour of strain-rate sensitive square plates”, Developments in the Collision and Grounding of Ships and Offshore Structures, C. Guedes Soares (Ed.), Taylor and Francis Group, London, pp. 171-178

Due to the effect of material’s strain-rate sensitivity, the response of structures under extreme loadings (such as blast, slamming, impact) quite often do not comply with the scaling laws. This breakdown limits the use of a scaling model to infer the response of a prototype in the tests. This paper is dedicated to solving the non-scalability of the saturated impulse behaviour for strain-rate sensitive square plates under rectangular pressure pulse. A dimensional analysis based on a new set of primary dimensions of density p static yield stress o0 , the thickness H and the side length L is derived. Based on the similitude criteria of dimensional analysis and a rigid, perfectly plastic analysis method, distorted scaled models are developed, which have individual scale factors for the side length and the thickness respectively, rather than the standard one with a uniform scale factor. The rigid, perfectly plastic prediction shows that the distorted scaled models can behave the same with the prototype. To verify the technique, elastoplastic numerical simulations for the distorted scaled models are performed by finite element (FE) code ANSYS-LSDYNA. The FE results show that the distorted scaled models can predict the prototype satisfactorily.

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