Finite Element Simulation And Experiment Of Tensile Properties Of Q235

Materials will appear the phenomena of deformation, damage, failure or destroywhen they are under loads. Research of materials deformation behaviors and injurymechanisms under external loads is a key fundamental problem to ensure improvingthe mechanical properties and service reliabilities of materials. Most traditional testingmeans of materials mechanical properties realize the measuring of materials basicmechanical parameters but hardly can achieve the monitoring and research of thedynamic deformation and damage when the materials under loads, therefore, thedynamic in-situ test of deformation behavior and injury mechanisms of materialsunder loads at the micro scale by methods of high-resolution imaging combining withspecialized test equipments will become an important means and methods of futuretest and analysis materials micro-mechanical properties. The control of parameters ofstretching rate, strain rate and temperature etc in the stretching test affects thematerials deformation of injury situation very remarkably. At the same time, to carryout finite element simulation of the stretching process, which has significance ofreliability prediction and life assessment, can reveal deformation behavior anddamage mechanisms of materials and be conducive to in-depth explore the injury lawof the materials or products under external loads combining with test. Carried thefinite element simulation analysis and experimental research of Q235stretchingprocess. This article launched the following work at four aspects:First of all, introduce the domestic and foreign research status. Describe the basicprinciples of tensile mechanical testing and metal fracture and failure. Introduce themechanisms of the impact of stretching rate, temperature and strain rate, etc onyield strength and other mechanical properties and the connection of the materialitself structure influence on performance.Secondly, introduce the apparatus of the tensile test. Find out the disciplines fromthe stress-strain curve after stretching the specimen of Q235materials at different strain rates and stretching rate. To draw the following conclusions through the testdata：the tensile strength increased with the increasing of stretch rate and thedeviations of the intensity extreme values of each set of experimental data also hadthe trend gradually increasing. To analyze the fracture morphology and type of severalkinds of typical materials by scanning electron microscope。Then, use the software of MSC.Marc to simulate the test above. And the curvesof the simulation have the same trend as the data obtained with the experiment, toprove the rightness of the model. On the basis, input the parameter changing withtemperature in the constitutive model of Q235and simulate the change of stress-strainat different strain rates and high temperature of Q235successfully。Obtain thestress-strain curve of the mechanical properties at high temperature of Q235。Tosupply the theoretical data of rolling at low temperature of Q235。Prove its rightnessand simulate the fracture process of Q235by the constitutive model of J-C.Finally, summarize the results of entire paper and the problems and defectsduring the operating process.