Dynamic Response Of Stainless Steel Composite Plate Under Ice Load

Dynamic characteristics are the key to determine the service performance of stainless steel composite plates.In view of the characteristics of ship plate steel load in polar marine environment,it is a little insufficient to evaluate whether the stainless steel composite plate meets the use requirements only with conventional mechanical properties such as tension,bending and shearing.The dynamic characteristics under different excitation loads should be taken into account.In this paper,for the purpose of evaluating the impact resistance of 316L-EH40 stainless steel composite plate,the ice load is used as the load excitation input from the theoretical and numerical simulation point of view to study the impact of various collision conditions parameters on the dynamic response of the stainless steel composite plate structure under ice load.The quasi-static and dynamic tensile tests of 316 L steel and EH40 steel were carried out by Zwick universal material testing machine and Instron high-speed testing system.Based on the test data of stress-strain curve,yield strength change relationship and Cowper Symonds model,the dynamic constitutive relationship considering temperature effect and strain rate effect was proposed,and the constitutive model was applied to numerical simulation calculation by LS-DYNA,and the engineering practical value of layered modeling and dynamic constitutive relation of stainless steel composite plate is compared and verified.Based on the energy method and the classic laminated plate theory,the ice load on the platform is calculated,the parameters of the extreme working conditions are determined,and the design of the interlayer structure parameters is considered.Through the bending balance differential equation under the transverse load,the simplified analytical model of the deflection response of the stainless steel composite plate under the ice load is established,and the comparative analysis of the calculation examples is carried out to verify the accuracy of the simplified analytical model in this paper.Based on the extreme operating condition determined in the calculation of the platform ice load,the 316L-EH40 stainless steel composite plate was subjected to numerical simulation of the impact deflection response,and the deflection response of the composite plate was analyzed from a macro perspective to study the layer thickness comparison deflection.The influence of layer thickness ratio on the deflection characteristics is studied,and the impact resistance of the composite plate within the current thickness matching mechanism is determined.Considering the stress-strain curve of single-layer material and the thermophysical parameters of the material,the thermo mechanical coupling model of ice ball high-speed impact composite plate is established.The impact angle and the temperature difference in the composite plate that affect the dynamic response law of the composite plate structure are analyzed.Based on the energy absorption and conversion,temperature field,impact force,stress and normal displacement of the composite plate,different working conditions are analyzed.The impact resistance and dynamic response of composite plates under load are studied systematically.Through the above work,a simplified analytical calculation model of the deflection characteristics of the double-layer metal composite plate under the impact load is put forward,and the dynamic behavior prediction of the stainless steel composite plate under the impact load is realized.The research on the dynamic response of the structure of the stainless steel composite plate under the ice load is developed to provide a reference for the service performance evaluation of the composite plate.