材料断裂力学性能的多场耦合测试与实验教学探讨
Multi-field-coupled testing and experimental teaching discussion of material fracture properties
Received:November 02, 2022  Revised:December 29, 2022
DOI:10.7520/1001-4888-22-271
中文关键词:  断裂力学  高速摄像  红外热像  裂纹长度  教学实验
英文关键词:fracture mechanics  high speed camera  infrared thermal image  crack length  teaching experiment
基金项目:国家自然科学基金项目(12272276,11972264);广东省自然科学基金项目(2021A1515010237);武汉大学教师教学发展研究项目;武汉大学研究生导师育人方式创新项目
Author NameAffiliation
WANG Zhengzhi Department of Engineering Mechanics, School of Civil Engineering, Wuhan University, Wuhan 430072, Hubei, China 
PENG Qingyue Department of Engineering Mechanics, School of Civil Engineering, Wuhan University, Wuhan 430072, Hubei, China 
CHEN Ruohong Department of Engineering Mechanics, School of Civil Engineering, Wuhan University, Wuhan 430072, Hubei, China 
YAN Shuogeng Department of Engineering Mechanics, School of Civil Engineering, Wuhan University, Wuhan 430072, Hubei, China 
HUANG Kai* Department of Engineering Mechanics, School of Civil Engineering, Wuhan University, Wuhan 430072, Hubei, China 
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中文摘要:
      金属材料的断裂测试实验是全面了解材料力学性能的重要一环,目前实验教学中广泛采用的方法是通过测定断裂后试样断口的特征裂纹长度来获得断裂韧度,但缺乏对裂纹演化全过程的直接观测,限制了学生对断裂指标判据、破坏形式和断裂机理的深入理解。为了使学生更加直观、全面地掌握断裂力学实验、理解断裂力学行为,本文提出一种多场耦合同步测试材料断裂行为的教学模式:通过高频高精度红外与高速显微数字图像相关技术,对裂尖温度场与应变场进行实时检测,从而实现对裂纹长度的同步测定、裂尖塑性区的可视化表征以及断裂特征的捕捉和分析;结合经典断裂力学理论,对不同条件的断裂韧度教学实验进行了探索和改进。初步教学实践表明,该课程丰富的实验内容和新颖的观测现象可以加深学生对断裂力学理论的理解,从而拓展学生解决实际科学问题的思路。
英文摘要:
      The fracture test experiment of metal materials is an important part to comprehensively understand the mechanical properties of materials. At present, the method widely used in experimental teaching is to measure the characteristic crack length of the fracture surface of the sample after fracture to obtain the fracture toughness. The lack of direct observation of the whole process of crack evolution limits the students' in-depth understanding on the fracture index criterion, failure form and fracture mechanism. In order to make students master fracture mechanics experiment and understand fracture behavior more intuitively and comprehensively, this paper proposes a teaching mode of multi-field coupling synchronous testing material fracture behavior. The real-time detection of the temperature field and strain field at the crack tip was carried out by using high-frequency high-precision infrared and high-speed microscopic DIC technology. The synchronous and accurate measurement of the crack length, the visual characterization of the plastic zone at the crack tip, and the capture and analysis of the fracture characteristics were realized. Based on the classical fracture mechanics theory, the teaching experiment of fracture toughness under different conditions is explored and improved. The preliminary practice teaching shows that the rich experimental contents and novel observation phenomena of this course deepen the students' understanding of fracture mechanics theory, and expand the students' ideas to solve practical scientific problems.
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