贯穿型缺口小冲杆试样确定高钢级管线钢断裂韧度的研究  

Determination of Fracture Toughness of High-grade Pipeline Steel Based on Though-thickness-notched Specimen by Small Punch Test

作　　者：宋明 祖毅真 马帅 王炳英 曹宇光[1] 蒋文春[3] SONG Ming;ZU Yizhen;MA Shuai;WANG Bingying;CAO Yuguang;JIANG Wenchun(College of Pipeline and Civil Engineering,China University of Petroleum(East China),Qingdao 266580;College of Materials Science and Engineering,China University of Petroleum(East China),Qingdao 266580;College of New Energy,China University of Petroleum(East China),Qingdao 266580)

机构地区：[1]中国石油大学(华东)储运与建筑工程学院,青岛266580 [2]中国石油大学(华东)材料科学与工程学院,青岛266580 [3]中国石油大学(华东)新能源学院,青岛266580

出　　处：《机械工程学报》2022年第12期83-92,共10页Journal of Mechanical Engineering

基　　金：国家自然科学基金(51805543);山东省自然科学基金(ZR2019MEE108);油气管道及储运设施完整性评价技术研究(2016YFC0802105);中央高校基本科研业务费专项资金(18CX05002A)资助项目。

摘　　要：小冲杆试验作为一种微损测试技术,在评估石油化工行业在役设备材料性能劣化方面具有广阔的发展潜力。提出了一种使用贯穿型预制缺口小冲杆试样评价材料断裂韧度的方法,以X80高钢级管线钢为目标材料,开展了小冲杆试验评价材料断裂韧度的研究。首先,设计一种贯穿型预制缺口试样,并进行小冲杆试验。其次,进行缺口试样的有限元模拟,结合试验数据修正模型,并确定缺口试样的最佳尺寸。最终,通过数值模拟围线积分法得到贯穿型缺口试样的回路J积分曲线,结合起裂位移确定小冲杆试验的临界断裂韧度JC(SP),同时进行标准SENB试样三点弯试验得到材料JC值,通过引入系数k建立二者的关联关系,建立使用贯穿型预制缺口小冲杆试样获得X80高钢级管线钢断裂韧度的方法。As a miniature specimen testing technology,small punch test(SPT)has a broad development potential in evaluating the performance deterioration of equipment and materials in petrochemical industry.A method for evaluating fracture toughness of materials by SPT through notches is proposed.Taking X80 high-grade pipeline steel as the target material,the small punch test is carried out to evaluate the fracture toughness of materials.First of all,a through type prefabricated notch specimen is designed and the small punch test is carried out.Secondly,the finite element simulation of the through type prefabricated notch specimen is performed while the model was modified with the test data.And the optimal size of the notched specimen was determined.Finally the J-integral of each contour is obtained by contour integral method and the critical fracture toughness JC(SP)of small punch test is determined by the crack initiation displacement.Meanwhile,the JC value of material is obtained by standard SENB three-point bending test.Finally,the relationship between JC and JC(SP)of the high-grade pipeline steel was established by using the proposed method with the notched SPT specimen.

关 键 词：小冲杆试验 断裂韧度 贯穿型缺口 J积分 X80管道钢 

分 类 号：TG115[金属学及工艺—物理冶金]