摘要
在不同试验温度下,对X70管线钢缺口沿厚度方向的标准夏比V型缺口试样进行动态试验和静态试验,研究了X70管线钢的力学性能与加载速率的关系.通过对试验实测的载荷-位移曲线和破坏断口的分析,发现X70管线钢的韧性、试验曲线上最大载荷所对应的位移随试验温度降低而降低;同一试验温度下动态试验曲线上最大载荷所对应的位移小于静态试验曲线上最大载荷所对应的位移;加载速率对试样断面沿厚度方向收缩的影响与试验温度有关;无论是动态试验还是静态试验,试样断口均出现垂直于缺口方向的分层裂纹;试验温度对动态试验屈服载荷、最大载荷以及静态试验最大载荷的影响较小;随着试验温度升高,裂纹形成功和破坏总功均升高,加载速率对破坏总功的影响同样与试验温度有关.
The toughness of X70 pipeline steel under low strain rate (static conditions) and impact (dynamic conditions) is tested at -60°C, -20°C and 20°C, respectively. By analyzing the load-displacement curve and fracture surface of specimens, the relation between mechanical behavior and loading rate is investigated. The results show that the toughness and the displacement at the peak load decrease with the fall of the test temperature; the displacement at the peak load of dynamic test is less than that of static test at the same temperature; the specimen thickness reduces in the front of notch and is related to the loading rate and the test temperature; the delamination crack that is perpendicular to the notch can be observed in both dynamic and static tests; the yield and peak loads of dynamic test are possibly independent of the test temperature; and both cracking and damage work increase with the test temperature. The relation between loading rate and damage work is relevant to the test temperature.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2003年第5期488-491,共4页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目 (50 2 750 73 )
教育部青年骨干教师基金资助项目
中国石油天然气总公司管材研究中心资助项目
关键词
X70管线钢
静态试验
动态试验
分层裂纹
Cracks
Delamination
Dynamics
Mechanical properties
Pipelines
Strain rate
Testing
