摘要
以Q355钢紧凑拉伸(compact tensile,CT)试件为研究对象,采用数字图像相关法(digital-image correlation,DIC)获取加载过程中试件表面全场的位移和应变。基于断裂力学理论,计算Q355钢CT试件在不同回路积分路径下的J积分,并将数字图像相关法与有限元模拟和单试样法计算的断裂韧性结果对比分析。结果表明:DIC方法与有限元模拟得到的裂缝扩展区域的应变云图吻合较好;DIC方法与有限元模拟计算断裂韧性的结果平均误差在3%以内,与单试样法计算的断裂韧性结果最大误差为8.30%,平均误差为7.41%,说明DIC技术在计算CT试件断裂韧性中是可行和准确的。
Taking the fracture toughness of Q355 steel compact tensile specimen as the research object,the digital image correlation(DIC)method is used to obtain the full field strain and displacement on the specimen surface during loading.Based on the theory of fracture mechanics,the J integral of Q355 steel CT specimen under different circuit integration paths is calculated.The results of fracture toughness calculated by DIC,finite element simulation and single sample method are compared and analyzed.The results show that the strain nephogram of crack propagation region obtained by DIC and finite element simulation are generally consistent.The average error of the fracture toughness calculated by DIC and finite element simulation is within 3%,and the maximum error of the fracture toughness calculated by the single sample method is 8.3%,and the average error is 7.41%.It shows the accuracy and feasibility of DIC technology in calculating the fracture toughness of CT specimen.
作者
莫林
范懿文
陈一元
常岩军
黄梦青
MO Lin;FAN Yiwen;CHEN Yiyuan;CHANG Yanjun;HUANG Mengqing(The First Construction Engineering Group Co.,Ltd.of Guangxi Construction,Nanning 530001,China;School of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,Nanning 530004,China)
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2023年第5期1042-1050,共9页
Journal of Guangxi University（Natural Science Edition）
基金
国家自然科学基金项目(11962001,51968004)
广西创新驱动重大专项(AB22036007)。
关键词
数字图像相关法
Q355钢
断裂韧性
单试样法
digital image correlation method
Q355 steel
fracture toughness
finite element simulation
single sample method
