文献类型：期刊文献

中文题名：小试样高通量蠕变及蠕变裂纹扩展试验装置设计

英文题名：Design of high-throughput creep and creep crack growth testing equipment based on small specimen techniques

作者：李思宽[1];谈建平[1];张坤[1];史浩[1];刘利强[1];庄法坤[2];涂善东[1]

机构：[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]中国特种设备检测研究院,北京100029

年份：2019

卷号：45

期号：12

起止页码：83

中文期刊名：中国测试

外文期刊名：China Measurement & Test

收录：CSTPCD;;北大核心:【北大核心2017】；

基金：国家重点研发计划(2018YFC0808800);国家自然科学基金(11472105,11502082)

语种：中文

中文关键词：蠕变;蠕变裂纹扩展;小试样;高通量;试验装置

外文关键词：creep;creep crack growth;small specimen;high-throughput;experiment equipment

摘要：对于某些取样受限的结构,如在役构件、薄壁件、焊接接头、功能性梯度结构,无法采用传统试样测试获得高温蠕变及裂纹扩展性能,小试样测试方法使得此类构件的高温力学性能的获取成为可能。但现有小试样蠕变试验装置用途单一且存在试样氧化的问题,无法满足试验要求。本文设计一种基于小试样的材料蠕变及蠕变裂纹扩展性能测试装置,装置配备专用夹具和真空系统,可满足不同种类小试样真空环境下的高温试验,避免试样氧化,并可同时完成6个同类或不同类型小试样的蠕变和蠕变裂纹扩展试验。装置采用马弗炉对试样加热,最高试验温度可达1200℃。采用光栅位移传感器测量小试样变形量,直流电位法测量裂纹长度,提高了变形测量精度。试验结果表明,该装置可以精确测量小试样位移和裂纹长度,用以研究材料蠕变及裂纹扩展性能。
It is generally hard to obtain creep and creep crack growth properties using traditional specimens for certain sampling limited structures such as in-service structures,thin-walled structures,welded joints and structures with functional gradient materials.The recently developed small specimen testing technique makes it possible to obtain high temperature mechanical properties of such structures.However,the existing small specimen creep testing equipment cannot test different types of specimens at the same time and can hardly avoid problem of specimen oxidation.In this study,a high-throughput creep and creep crack growth testing equipment based on small specimen techniques is developed.The equipment uses different fixtures to fit different kinds of small specimens and can be vacuumed to prevent specimens from oxidizing.Creep and creep crack growth tests on six different or the same kinds of small specimens can be performed at the same time.The specimen is heated by a muffle furnace,and the maximum temperature is up to 1200℃.Grating displacement sensors and direct current electrical potential instrumentations are used to measure deformation and crack length of specimens,respectively.The testing results show that the equipment can accurately measure the displacement and crack length of small specimen to investigate the creep and crack growth properties of materials.