循环载荷作用下AZ31B镁合金的热成像研究：温度演化分析与疲劳极限估计

Thermographic Study of AZ31B Magnesium Alloy under Cyclic Loading: Temperature Evolution Analysis and Fatigue Limit Estimation.

作者信息

Guo Shaofei, Liu Xuesong, Zhang Hongxia, Yan Zhifeng, Zhang Zhongdian, Fang Hongyuan

机构信息

State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China.

College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China.

出版信息

Materials (Basel). 2020 Nov 18;13(22):5209. doi: 10.3390/ma13225209.

DOI:10.3390/ma13225209

PMID:33218031

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7698634/

Abstract

In this paper, infrared thermography was employed to study the fatigue process of AZ31B magnesium alloy. In order to eliminate the interference caused by the temperature rise of the fixture, a data processing method was proposed, which is based on a special model to describe the temperature change of the specimen. Based on the temperature data after processing, the temperature evolution indicates that AZ31B magnesium alloy has undergone cyclic hardening during fatigue. Three different temperature indicators were selected to evaluate the fatigue limit based on the evolution curve after processing. In addition, the experimental results showed that the temperature data processed by the proposed method can be used to estimate the fatigue limit of AZ31B magnesium alloy. Experiments were performed for both extrusion and transverse directions in consideration of the anisotropy of the AZ31B.

摘要

本文采用红外热成像技术研究AZ31B镁合金的疲劳过程。为消除夹具升温带来的干扰，提出了一种基于特殊模型描述试样温度变化的数据处理方法。基于处理后的温度数据，温度变化表明AZ31B镁合金在疲劳过程中经历了循环硬化。根据处理后的演变曲线，选择三种不同的温度指标来评估疲劳极限。此外，实验结果表明，采用该方法处理后的温度数据可用于估算AZ31B镁合金的疲劳极限。考虑到AZ31B的各向异性，对挤压方向和横向都进行了实验。