材料断裂韧性-微观形貌-有限元仿真一体化综合实验设计  

Integrated Experimental Design of Fracture Toughness,Micromorphology and Finite Element Simulation

作　　者：张玉财[1] 宋明[1] 周凡 ZHANG Yucai;SONG Ming;ZHOU Fan(College of New Energy,China University of Petroleum(East China),Qingdao 266580,Shandong,China)

机构地区：[1]中国石油大学(华东)新能源学院,山东青岛266580

出　　处：《实验室研究与探索》2023年第5期183-189,共7页Research and Exploration In Laboratory

基　　金：国家自然科学基金面上项目(52275167);中国石油大学(华东)探究性实验项目(202002227)。

摘　　要：针对常规断裂韧性测试难以在服役设备中应用的问题,基于压痕测试理论,利用纳米压痕设备从不同加载速率、压入载荷两个因素对X80管线钢的断裂韧性进行了测试与表征,同时利用原子力显微镜对压痕形貌进行了探究,并通过有限元仿真对压痕测试的整个过程进行了再现。结果表明,X80管线钢断裂韧性测试值均随加载速率和压入载荷的增大而减小,材料的压痕形貌堆积现象较为显著;有限元仿真获得的堆积高度与实验数据吻合较好,进而说明有限元仿真能有效再现压痕测试的整个过程。X80管线钢断裂韧性-微观形貌-有限元仿真一体化综合实验的设计与开展,对压痕实验研究及参数选取具有较好的指导意义,同时可以增强学生的科研思维能力和实践动手能力。Focusing on the problem that conventional fracture toughness testing can hardly be carried out for the in-service equipment,in present paper,based on the indentation testing theory,the fracture toughness of X80 pipeline steel is tested and characterized by nano-indentation equipment under different loading rates and applied loads.And then the indentation morphology is explored by atomic force microscope.Finally,the whole process of indentation test is simulated by the finite element method.The results show that the fracture toughness of X80 pipeline steel decreases with the increasing of loading rate or applied load,and the accumulation of indentation morphology is significant.The accumulation height obtained by finite element simulation is in good agreement with that the experimental data,which indicates that finite element method can reproduce the whole process of indentation test effectively.The integrated experiment of fracture toughness,microscopic morphology and finite element simulation of the material has a good guiding significance for the investigation of indentation experiment and the selection of testing parameters.Furthermore,it can significantly cultivate the students' scientific research thinking ability and practical ability.

关 键 词：断裂韧性 纳米压痕 微观形貌 有限元仿真 综合实验 

分 类 号：G642.0[文化科学—高等教育学] G642.423[文化科学—教育学]