Study On Mechanical Properties Of Equipment Cabin Frame Made Of CFRP

Composite materials are widely used in Aeronautics and Astronautics due to their excellent mechanical properties.However,there are few researches on the application of rail carrying parts.And the application of composite materials in rail carrying parts in China started late.It is a semi-empirical and semi-theoretical state.The cabin is a key component that is installed at the lower end of the body to protect the equipment and improve the aerodynamic performance.The equipment cabin frame is the main bearing part of the cabin,which is composed of a crossbeam,a sidebeam and an arc beam.The cabin of Chinese standard EMU is mostly used in composite materials.Our country has developed a comprehensive independent intellectual property rights.However,there are few researches on the application of composite materials in the rail carrying parts.Therefore,it is of great significance to evaluate the mechanical properties of the composite equipment cabin frame for the application of composite materials in the equipment cabin and the whole high-speed train.In this paper,by using ABAQUS finite element simulation analysis software to evaluate static strength,fatigue strength and random vibration fatigue damage of equipment cabin made of carbon fiber materials based on IEC61373-2010 "railway vehicle equipment shock and vibration test standard",EN12663-2010 "railway track application--body technical requirements" and the German Lloyd’s "Guideline for the Certification of Wind Turbines" given the load conditions and the evaluation methods.The results show that the bending compression safety margin of equipment cabin made of carbon fiber is low under static strength evaluation work in the abnormal aerodynamic load working conditions.It should focus on strengthening in dangerous places.In addition,the other can meet the requirement,and has high safety margin.In the fatigue strength evaluation work,according to the fatigue limit method,it can be showed that the seat safety margin is less than 1 under aerodynamic load connecting.So it would be destroyed.Sidebeam safety margin is small,it should be strengthened in the dangerous parts.In addition,the other can meet the requirement,and has high safety margin.Based on the analysis of the random vibration fatigue damage,it can be concluded that the fatigue damage of the composite equipment cabin frame is very small according to the given ASD spectrum,which meets the design requirements.In addition,the contrast experiment to verify the reference of German Lloyd’s Goodman curve.Research shows that the analysis of fatigue strength of equipment frame made of carbon fiber material according to the Goodman curve given German Lloyd’s is feasible.Considering the safety coefficient of n=1.15,n=1.5 and n=2 cases and empirical Goodman curve comparison showed that the safety coefficient of the n=1.15 is feasible,but for fatigue evaluation in n=1.5 and n=2 cases with a certain risk.