基于压痕测试技术的聚乙烯老化力学性能评价  

Evaluation of Aging Mechanical Properties of Polyethylene Based on Indentation Testing Technology

作　　者：代星辰 黄奕昶 关凯书[1] DAI Xingchen;HUANG Yichang;GUAN Kaishu(Key Laboratory for Pressure Systems and Safety,School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China;Shanghai Special Equipment Supervision and Inspection Institute,Shanghai 200333,China)

机构地区：[1]华东理工大学机械与动力工程学院,承压系统与安全教育部重点实验室,上海200237 [2]上海市特种设备监督检验研究院,上海200333

出　　处：《机械工程材料》2023年第1期106-110,共5页Materials For Mechanical Engineering

摘　　要：在85℃下对聚乙烯试样进行不同时间(0,168,312,408 h)的热氧加速老化试验,通过压痕测试技术得到不同老化时间下聚乙烯试样的最大载荷,通过有限元数值模拟建立屈服强度与最大载荷的线性关系,计算老化后的屈服强度,并与拉伸试验结果进行对比。结果表明:随着老化时间的延长,拉伸试验得到聚乙烯试样的屈服强度逐渐增加,压痕试验得到最大载荷也逐渐增加;通过有限元方法建立的聚乙烯试样压痕试验最大载荷和屈服强度的线性相关系数为0.995,基于压痕试验获取的最大载荷计算得到的不同老化时间聚乙烯试样屈服强度与拉伸试验结果之间的相对误差小于1.5%,说明压痕测试技术能够较准确地获取老化后聚乙烯的屈服强度。The thermal oxygen accelerated aging test for different times(0,168,312,408 h)of polyethylene specimen was carried out at 85℃,and the maximum load of polyethylene specimen with different aging times was obtained by indentation testing technology.The linear relationship between yield strength and maximum load was established by finite element numerical simulation,and the yield strength after aging was calculated and compared with the tensile test results.The results show that with the extension of aging time,the yield strength of polyethylene specimens obtained by tensile test gradually increased,and the maximum load obtained by indentation test also gradually increased.The linear correlation coefficient between the maximum load and yield strength of polyethylene specimen indentation test established by finite element method was 0.995,and the relative error between the yield strength of polyethylene specimen with different aging times calculated with the maximum load obtained by indentation test and the tensile test results was less than 1.5%,indicating that the indentation testing technology could accurately obtain the yield strength of polyethylene after aging.

关 键 词：聚乙烯管道 压痕测试技术 老化 屈服强度 最大载荷 

分 类 号：TG115.5[金属学及工艺—物理冶金]