Study On Creep And Fatigue Behavior Of ABS Polymer Based On Finite Element Secondary Development

ABS is a widely used engineering plastic,but it may experience stress cracking during transportation and long-term use.This phenomenon can have a negative impact on the lifespan and performance of ABS material,ultimately affecting the product’s effectiveness and lifespan.Creep and fatigue of materials have always been phenomena of interest in the engineering field.With the development of additive manufacturing technology,the use of ABS is becoming more and more widespread.This thesis focuses on the creep and fatigue behavior of a TV bracket,and conducts in-depth research through experimental studies,theoretical modeling,and numerical simulations.The main work includes the following aspects:(1)In terms of the creep model of ABS material,this thesis builds a creep damage constitutive model based on the Bailey-Norton model and considering the Lemaitre damage evolution law,to achieve the prediction of creep failure of ABS material under long-term loads.(2)By conducting uniaxial tensile tests and creep tests on ABS material specimens,the elastic-plastic parameters and creep constitutive parameters of ABS material are obtained.By performing long-term load creep tests on ABS structural components,the sinking displacement of ABS structural components under long-term loads is obtained,laying the foundation for verifying the accuracy of simulation.(3)Based on Abaqus finite element software,an ABS creep damage constitutive model is developed,and the UMAT subroutine is used to achieve secondary software development,which enables creep damage simulation at both material and structural levels.Based on this model,the cyclic stress and creep effects on ABS structural components during long-term use and transportation can be simulated.By comparing the simulation results with the experimental results,the reliability of the subroutine is demonstrated.(4)Based on the material single cell fatigue failure theory,a fatigue failure model of ABS material under cyclic loads is established,describing the attenuation law of material mechanical properties,and studying the fatigue failure behavior of ABS material under the influence of temperature cycles and stress cycles.In summary,this thesis has studied the creep model and fatigue failure model of ABS material,and provided reliable theoretical foundations and simulation tools for product design through simulation analysis.This research method and simulation analysis tool can be widely applied in the application and development of ABS material,providing effective means to improve product design reliability and reduce product development costs.