聚醚醚酮的室温单轴棘轮行为  

Uniaxial Ratchetting Behavior at Room Temperature of Polyether-Ether-Ketone

作　　者：周敏[1] 袁江宏 康国政[1] ZHOU Min;YUAN Jianghong;KANG Guozheng(Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province,School of Mechanics and Aerospace Engineering,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]西南交通大学力学与航空航天学院,应用力学与结构安全四川省重点实验室,成都611756

出　　处：《机械工程材料》2023年第1期19-25,33,共8页Materials For Mechanical Engineering

基　　金：国家自然科学基金面上资助项目(11972312)。

摘　　要：在室温下对聚醚醚酮(PEEK)进行一系列非对称应力控制的单轴循环棘轮变形试验,研究了应力水平、加载历史、应力速率和峰值应力保持时间对PEEK棘轮行为的影响规律。结果表明:PEEK在非对称应力循环加载下产生了明显的棘轮行为,棘轮应变包含可恢复的黏弹性应变和不可恢复的黏塑性应变;棘轮应变和棘轮应变速率均随着应力水平的增加而增大;PEEK的棘轮行为具有明显的加载历史效应,高平均应力的加载历史会抑制后续低平均应力循环过程中棘轮变形的发生,低平均应力的加载历史对后续高平均应力循环过程中的棘轮变形影响不大;PEEK的棘轮行为具有明显的时间相关特性,应力速率越低、峰值应力保持时间越长,棘轮应变越大。A series of asymmetric stress-controlled uniaxial cyclic tests were performed on polyether-etherketone(PEEK)at room temperature,and the influence laws of stress level,loading history,stress rate and peakstress holding time on the ratchetting behavior were studied.The results show that the PEEK exhibited obvious ratchetting behavior during the asymmetric stress cyclic loading,and the ratchetting strain consisted of the recoverable viscoelastic strain and the irrecoverable viscoplastic strain.Both the ratchetting strain and its rate increased with stress level.The ratchetting behavior of PEEK had an obvious loading history effect;the loading history under high mean stresses suppressed the ratchetting deformation in the subsequent cycle process under low mean stresses,and the loading history under low mean stresses had little effect on the ratchetting deformation in the subsequent cycle process under high mean stresses.The ratchetting behavior of PEEK showed obvious timedependence;the lower the stress rate and the longer the peak-stress holding time,the larger the ratchetting strain.

关 键 词：聚醚醚酮 棘轮行为 黏弹性变形 黏塑性变形 加载历史效应 时间相关特性 

分 类 号：TB324[一般工业技术—材料科学与工程]