Determination and Validation of Gurson-Tvergaard Model Parameters for Finite Element Simulation of Small Punch Test
Small punch test (SPT) is a miniature sample test technique which can evaluate in-service material properties with an almost non-destructive method.Since the deformation behavior of the small punch specimen is complicated, finite element simulation embedded with Gurson-Tvergaard (GTN) model is adopted to simulate elastic-plastic behaviour until fracture.Choosing the proper GTN parameters is crucial for the small punch simulation, which directly influence the precision of load-displacement curve obtained from simulation.In this paper, load-displacement curve is divided into five stages and the parameters identification process is done by adjusting the simulation curve with experimental load-displacement curve in different stages which controlled by separately parameters.The results show that the parameters determined based on this criterion are not unique.In order to validate the reliability of this method, specimens minimum thickness of cross-section after fracture was introduced as an extra criterion which turned out to be feasible.Load-displacement curves cannot serve as the only criterion to verify the GTN parameters.
Small punch test Finite element simulation GTN parameters Minimum thickness
Yanyan Lu Liang Chen Kaishu Guan
The Key Laboratory of Pressure Systems and Safety,Ministry of Education,East China University of Science and Technology,ShangHai,200237,China
国际会议
2014 International Symposium on Structural Integrity,ISSI2014(2014国际结构完整性学术会议)
兰州
英文
347-356
2014-08-20（万方平台首次上网日期，不代表论文的发表时间）