【作者】 郑兵； 黄志高； 张云； 李德群；

【Author】 Bing Zheng;Zhigao Huang;Yun Zhang;Huazhong University of Science and Technology;

【机构】 华中科技大学；

【摘要】 本文提出了一个改进的Johnson-Cook(JC)模型来表征聚醚醚酮(PEEK)在高温下的拉伸变形响应,该模型考虑了应变,应变速率和温度的耦合作用。在高温(293-438 K)和低应变速率(10-4-10-1s-1)条件下进行单轴拉伸试验,并讨论了PEEK变形行为的温度和应变速率依赖性。与传统的JC模型和Fei Chen的改进JC模型相比,本文提出的改进JC模型在每个温度下的偏差都是最小的,实验数据与修正JC模型之间的最大偏差为8%.更多还原

【Abstract】 A modified Johnson–Cook(JC) model was proposed to describe the tensile behavior of polyether-ether-ketone(PEEK) with the consideration of coupled effects of strain, strain rate and temperature. Uniaxial tension tests at elevated temperatures(293 to 438 K) and low strain rates(10-4 to 10-1 s-1) were performed, and the temperature-and strain rate-dependencies of the deformation behavior of PEEK were discussed. Compared with the traditional JC model and Fei Chen’s modified JC model, the deviations of the modified JC model proposed in this paper are the least at each temperature, the maximum deviation between the experimental dates and modified JC model are less than 8% at temperature of 416 K.更多还原