Discrete Element Simulation And Experimental Study On Filling Process And Mechanical Properties Of Mineral Composite

Mineral composite is a new type of composite materials formed by epoxy resin as binder,natural granite particles as aggregate.The mineral composite can be cast at room temperature.Without high temperature heating,the process is very simple.It could replace the traditional materials such as cast iron,cast steel,and could be used as base components of precision machine tools.Mineral composite has excellent damping performance,low thermal conductivity and good corrosion resistance.Therefore,the working accuracy of precision machine tools can be effectively improved.However,the shortcomings of mineral composites are also obvious.Because its mechanical property is not good as cast iron,the further application of the mineral composite is restricted.The filling process of mineral composite will directly affect the mechanical properties after casting.In terms of this,this paper focuses on the filling and mechanical properties of mineral composite.In order to save the cost of the experiment and shorten the research period,this paper introduces numerical simulation to study the mineral composites.Given the non-continuity characteristics of the material itself,the discrete element method was used to simulate the properties of the material.In this paper,the shape characteristics of aggregate particles are studied from the aspects of overall shape and angularity.Several shape parameters are counted,and a model that accords with the shape of real aggregates is established,which is of great significance for accurately analyzing the properties of mineral composite.From the perspective of mesoscale,mineral composite is studied by discrete element method.Through calibration experiments,the contact parameters and contact model parameters which agree with reality were obtained.The filling vibration process of mineral composite beam is analyzed,and the distribution regularity of particles with different sizes is obtained.The filling process of mineral composite in the machine tool is further studied.The voidage distribution of particles and the distribution of particles with different sizes under two different filling directions are analyzed.It is proved that there are more particles with larger size in the upper position in the mould.The wear of mould by aggregates is also studied in this paper.The compressive properties of mineral composite specimens in different directions are also studied.The anisotropy of compression modulus and strength is analyzed,which is caused by the heterogeneous distribution of aggregates during filling vibration process.The bending properties of mineral composite beams are studied.It is proved that the deflections of beams differ in different directions.