基于超声的PE拉伸失效过程探究及前兆预测  

Investigation and Prediction of Tensile Failure Process of Polyethylene based on Ultrasound

作　　者：赵民心 李俊 史君林 李涛 陈晔 Zhao Minxin;Li Jun;Shi Junlin;Li Tao;Chen Ye(School of Mechanical Engineering,Sichuan University of Science&Engineering,Zigong 643000,China)

机构地区：[1]四川轻化工大学机械工程学院,四川自贡643000

出　　处：《工程塑料应用》2023年第3期107-112,共6页Engineering Plastics Application

基　　金：国家质检总局科研项目(2017QK121);过程装备与控制工程四川省高校重点实验室项目(GK201809)。

摘　　要：为了探究聚乙烯(PE)管道拉伸失效过程中的声速变化规律,在5种不同形变速率的拉伸破坏实验基础上,采用脉冲反射法和4种频率对PE管材拉伸破坏过程中的声速分布规律进行了研究,结合幂函数法和超声声速模型建立了基于声速的PE材料失效预测模型。结果表明,PE管材在拉伸破坏过程中的声速与管材的失效程度和超声频率有很好的线性关系,而与形变速率关系并不显著;在弹性阶段的声速稳定在2200 m/s以上,屈服阶段的声速范围维持在2100~2200 m/s之间,颈缩阶段的声速范围维持在1900~2100 m/s之间,断裂阶段材料声速范围维持在1700~1900 m/s之间;超声失效预测模型能很好地拟合PE材料的拉伸性能,发现拟合结果与实验结果基本一致,其误差在3.4%左右。最后在上述研究基础上提出了基于声速的PE管材失效前兆预测方法,验证结果表明基于声速的PE管材失效前兆预测方法是可行的。In order to investigate the change law of sound velocity in the process of tensile failure of polyethylene(PE)pipe,the distribution law of sound velocity in the process of tensile failure of PE pipe was studied by means of pulse reflection method and four frequencies on the basis of the tensile failure experiment of five different deformation rates.The failure prediction model of PE material based on sound velocity was established by combining the power function method and ultrasonic sound velocity model.The results show that the sound velocity has a good linear relationship with the failure degree and ultrasonic frequency of PE pipe in the process of tensile failure,but has no significant relationship with the deformation rate.The sound velocity is stable above 2200m/s in the elastic stage,2100-2200 m/s in the yield stage,1900-2100 m/s in the neck contraction stage,and 1700-1900 m/s in the fracture stage.The ultrasonic failure prediction model can well fit the tensile mechanical properties of PE material,and the fitting results are basically consistent with the experimental results,with an error of about 3.4%.Finally,on the basis of the above research,a prediction method of the failure precursor of PE pipe based on sound velocity is proposed.The verification results show that the prediction method of the failure precursor of PE pipe based on sound velocity is feasible.

关 键 词：聚乙烯 力学响应 预测模型 超声检测 失效预测 

分 类 号：TQ322.3[化学工程—合成树脂塑料工业]