Dynamic Tensile Test And Simulation Of Hybrid Composite

No matter in the field of aerospace,or in the field of ships,vehicles,wind-power blades,composites have become indispensable and crucial material in practical engineering because of their advantages of lightweight,fatigue resistance and high designability.In related applications,materials are often subjected to dynamic loads such as high-speed tensile and compression.Analyzing and studying the mechanical properties of fiber-reinforced resin matrix composites under different strain rates can better optimize the design of material structural parts in practical applications and improve the safety of equipment.In this paper,the hybrid composites of glass fiber and carbon fiber are taken as the research object,and the mechanical properties of glass/carbon uniaxial warp knitted fabric reinforced composites with different hybrid ratios and laying angles are studied by using ABAQUS finite element numerical simulation method under different strain rates.The study shows that the material has a certain strain rate sensitivity.The tensile strength increases with the increase of strain rate,and the failure strain increases or decreases with the increase of strain rate according to the hybrid ratio and laying angle.At different strain rates,the strain rate effect of glass/carbon hybrid composites decreases with the increase of the hybrid ratio,and the tensile strength reach the maximum when the carbon fiber layer angle is 0°,the failure strain reach the maximum when the carbon fiber layer angle is 90°.At the same time,this paper studies the mechanical properties of two-dimensional braided hybrid composite with braided angle is 45° under different loading rate.The simulation results show that with the increase of strain rate,the tensile strength and failure strain of the material all have varying degrees of increase,and the amplitude of increase of the tensile strength and failure strain increases with the increase of strain rate.Two-dimensional triaxial braided composites with braided angle is 45° was prepared by VARTM molding process,and dynamic tensile test was carried out on the sample using VHS 65/80-20 high speed test machine.The experimental results were compared with the simulation results,the tensile strength matches well,but the failure strain is poor.