Determination of Johnson–Cook parameters and evaluation of Charpy impact test performance for X80 pipeline steel

夏比冲击试验 钟摆 结构工程 材料科学 分离式霍普金森压力棒 韧性 管道(软件) 冲击能 半径 复合材料 工程类 机械工程 应变率 计算机科学 计算机安全
作者
Yuguang Cao,Ying Zhen,Ming Song,Haijiao Yi,Fagen Li,Xuyang Li
出处
期刊:International Journal of Mechanical Sciences [Elsevier BV]
卷期号:179: 105627-105627 被引量:81
标识
DOI:10.1016/j.ijmecsci.2020.105627
摘要

Controlling the Charpy impact toughness of materials is the key to the ductile fracture arrest design of pipelines. The finite element method based on Johnson–Cook (J-C) model has become an effective method to assist the experimental study of material impact toughness. In this paper, model parameters of J-C constitutive relation and damage parameters of J-C failure model for X80 pipeline steel have been determined experimentally from quasi-static uniaxial tension tests and Split Hopkinson Pressure Bar (SHPB) tests. Charpy impact test has been simulated using J-C constitutive and failure models with the determined parameters. Reasonable agreements between the simulation and experimental results have been achieved. On this basis, the effects of the pendulum velocity, specimen width and striker radius on Charpy impact test results are studied. The results show that pendulum velocity has negligible influence on Charpy impact test results; the maximum force and impact absorbed energy both have a highly linear relationship to specimen width; Charpy impact test is sensitive to striker geometry, the results measured by 2 mm-striker are obviously smaller than those of 8 mm-striker. Based on the above researches, the impact absorbed energy correlation model between sub-size specimens and standard full-size specimens, the test results transformation rules of the two strikers are established. The methods and results presented in this paper will provide references for dynamic behavior study, impact dynamic design, pipeline safety operation and risk assessment of high-grade pipeline steel.
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