Grinding Simulation And Experimental Research Of Quartz Fiber Woven Composites

With the development of industry,the application of new energy and new materials has gradually become a hot topic.The need for advanced composite materials has increased in modern industry.Composite materials play an increasingly important role in mechanical structures in the field of national defense.Research on the stiffness,strength and damage mechanism of fiber reinforced composites has always been a hot and difficult issue in the field of composite processing.Many scholars have analyzed the properties of composites by simulation and experiment.The research on the cutting and grinding mechanism of composite materials is not yet mature,and further exploration is still needed.This paper has simulated the grinding process of single fiber bundle at micro-scale by finite element method.The dynamic simulation of single abrasive grinding of quartz fiber composites is carried out on Mesoscale scale and grinding wheel grinding simulation of composite materials is carried out on Mesoscale scale.Acoustic emission technology is used to monitor the damage of composite materials.The different grinding properties and damage mechanism of quartz fiber composites with different fiber orientation angles were investigated by post-processing of acoustic emission signals and scanning electron microscopy(SEM)observation of the surface morphology of the processed materials.The research contents include:The mechanical model of the fiber bundle had been established on the micro scale,and the dynamic grinding process is simulated by using the finite element method.The fiber bundles had been given different material directions.The grinding force and the equivalent stress and strain produced by fiber bundle material at different angles between the axial direction and the grinding direction had been comprehensively analyzed.The influence of the anisotropy of composite materials on the grinding properties of materials been explored,and the effects of elastic modulus,shear modulus,tensile and compressive strength and shear strength on the grinding quality of materials had been explored.The dynamic simulation of single abrasive grinding of quartz fiber composites had been carried out on the micro scale.From the whole to the part,the possible damage modes and the whole failure modes of various phase materials in the processing of composite materials had been explored.The damage initiation and damage evolution of interface,matrix and fiber during failure had been investigated,and the effects of different composites on the properties of composites had been explored.According to the actual processing conditions,the grinding wheel machining model of quartz fiber composites had been established to simulate the processing process of composites more practically.The grinding simulation analysis was carried out by taking two vertical directions from each plane of the workpiece.The damage modes of materials were monitored by acoustic emission technology.Scanning electron microscopy(SEM)was used to observe the surface morphology of the workpiece and analyze the grinding performance of the material under different grinding directions of the grinding wheel.The relationship between surface quality of composites and fiber orientation angle,material strength and stiffness was analyzed.In this paper,the failure modes and progressive damage behavior of quartz fiber composites are analyzed and studied from simulation and experiment.In this paper,the dynamic finite element simulation of unidirectional fiber bundles and composite materials is carried out.The damage mode of the workpiece was monitored by acoustic emission technology,and the surface morphology of the workpiece was observed by SEM.The experimental results are in good agreement with the simulation results.We have concluded the grinding mechanism of quartz fiber composites by comparing experiments and simulations.