Research On Anti-Erosion Wear Of Composite Layer With Variable Elastic Modulus

Erosion wear?EW?refers to the tiny particles present in the air or liquid,which impact the surface of the material at a certain speed and angle,causing the loss and destruction of the material.EW widely exists in the construction of economy and national defense,which is one of the important factors leading to premature failure of workpieces,and has aroused wide attention of experts and scholars at domestic and abroad,therefore,studying the behavior and mechanism of EW can conducive to material loss reducing and the service life of parts increasing.In this paper,the composite layer with coupling and the material with the single layer are used as erosion comparison,the DPM model of computational fluid dynamics?CFD?is used to simulate the material erosion caused by particles.The particles velocity ranges from 20 to100m/s.The results show that the trajectory of the particles and the shape of the erosion scars are influenced by the flow field distribution when the particles are injected vertically.The erosion increases exponentially with the inlet velocity with/without the coupling of flexible material,and the pressure and the wall shear stress remain positively correlated with the velocity;the erosion rate?ER?of the coupled material is superior than that of the non-coupled when the velocity is greater than 70m/s.The Electrorheological fluid is designed to be the flexible coupling layer,the method of fluid-solid coupling are used and combined with UDF program to restore the random velocity entrance,the relationship between the elastic modulus??and the EW under different mass flow rate,particle radius and velocity.The results show that the EW of the material increases with the particle mass flow rate,and the EW of the material increases with the particle radius when it is greater than 0.2mm under the same conditions;the ER is positively correlated with the elastic modulus when the erosion velocity is 50m/s andrange from 2×10⁶ to 2×10⁹(6,the ER decrease when>2×10⁹(6.The erosion models of single and multiple particles are constructed and Johnson-Cook constitutive model in explicit dynamic is used to compare the erosion of material when the modulus of the coupling layer is 2×10⁹(6 and 2×10¹¹(6 respectively.The results show that strain transfer changes between coupling surfaces,and the elastic modulus has an opposite effect on the material erosion in the low speed region relative to the high speed.It can be concluded that in the study of the erosion process of composite layer materials,a variety of factors need to be considered comprehensively,and the overall material quality loss is the accumulation of all particles.