Preparation And Bending Properties Of Grass Fiber Reinforced Resin Matrix Composite Tubular Structure

As the concept of lightweight was first proposed in the automotive industry,lightweight has gradually become the development direction of many fields.For example,in the fields of aerospace,submarine ships,rail transportation,architectural decoration and sports equipment,lightweight has a very critical position.In addition,compared with traditional materials,resin-based composite materials have the characteristics of strong molding ability,high specific strength and specific modulus,good fatigue resistance,good damping and shock absorption characteristics,and failure form safety,which make it widely used in numerous fields;The most important thing is that because the light weight characteristics of the composite materials,they are gradually linked to the concept of light weight.Therefore,the research on the performance of composite structural parts has extremely important theoretical guidance and engineering application value.This thesis first comparatively analyzed the performance of various fiber reinforcements and resin matrix,combined with the use environment and requirements of Korean medical beds,and finally selected glass fiber as the reinforcement phase and epoxy resin as the matrix phase.In addition,i made the overall comparison of various preparation and molding processes.After the preparation process is determined,the preparation of each composite structural member of the Korean medical bed is completed.After certain processing of the prepared straight tubular structural member,the bending performance is tested,and the temperature is used as the control variable,and the temperature of the test is adjusted to-40 ?,0 ?,20 ?,40 ? and At 80?,the test results show that the bending strength corresponding to 40? and 80? has decreased by5.6% and 21.5% respectively compared with the bending strength at room temperature,and the bending strength has decreased by 14.3% and 24.2% respectively;0? and-40 The corresponding bending strength at the test temperature of ? is 4.1% and 28.5%higher than that at room temperature.The bending modulus is increased by 21% and42% compared to the modulus at 20°C.The main failure modes are chipping of the resin matrix and breakage and release of the glass fiber.In addition,this paper also discusses the influence mechanism of temperature on the bending properties of the material.In addition to experimental analysis and analysis,finite element simulation was used to calculate and analyze the material,and a finite element model of square tubular composite material was successfully created.By setting various parameters and loads,the distribution state of the stress and strain of the model were simulated.The comparison verifies the consistency between the simulation and the test results,and proves the reliability of the finite element simulation.In addition,by creating a finite element model of the T-shaped connector,the finite element simulation calculationmethod was used to analyze the stress and strain distribution of the connector under the bending load,and used this as the basis for the analysis and prediction of the material performance.