摘要
以核电安全端异种金属焊接接头(DMWJ)为研究对象,选用4个不同拘束的含中心裂纹单边缺口弯曲(SENB)试样,通过质量加速度施加法,分别对其施加5个地震烈度和3个实际地震下的竖向地震载荷,对不同竖向地震载荷和不同拘束下核电站DMWJ的断裂行为及竖向地震载荷与拘束效应的交互作用进行数值模拟。结果表明:随着地震烈度的增加,DMWJ的J-R曲线逐渐降低。与高拘束相比,低拘束时J-R曲线降低较为明显,这与不同拘束下DMWJ的断裂模式有关。实际地震载荷所引起的J-R曲线的改变不仅与地震震级有关,还与地震波的加速度时程曲线有关。
Nuclear power plants should be strictly protected against earthquakes. Especially in nuclear power pressure vessels, there are a lot of dissimilar metal welded joints(DMWJ). They are the weak link owing to their highly heterogeneous microstructure;mechanical;thermal;and fracture properties, and some defects that occur at different positions within the DMWJs. To ensure the safety of nuclear power pressure vessels, it is important to examine the fracture behavior of DMWJ in detail. In addition to the earthquake loads, constraint is an important factor affecting the fracture behavior of DMWJ. To understand this behavior, both constraint and earthquake loads must be considered. In this study, taking nuclear safe end DMWJ as the research object, four single edge-notched bend(SENB) specimens with central crack under different constraints were selected. Different vertical earthquake loads under five earthquake intensities and three actual earthquakes were applied to the specimen respectively by mass acceleration application method. The fracture behavior of DMWJ under various vertical earthquake loads and the interaction between vertical earthquake load and constraint were numerically simulated. The results showed that with the increase of earthquake intensity, the J-R curve of DMWJ gradually decreases. In contrast to the DMWJ with high constraint, the decrease of J-R curve of the DMWJ with low constraint is more obvious. It is related to the fracture mode of DMWJ under different constraints. Under the actual earthquake, the change of J-R curve is related not only to the earthquake magnitude, but also to the acceleration time history curve of earthquake wave.
作者
袁宏伟
杨杰
崔巍
陈浩峰
YUAN HongWei;YANG Jie;CUI Wei;CHEN HaoFeng(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Department of Mechanical&Aerospace Engineering,University of Strathclyde,Glasgow G11XJ,UK)
出处
《机械强度》
CAS
CSCD
北大核心
2022年第6期1469-1475,共7页
Journal of Mechanical Strength
基金
国家自然科学基金项目(51975378,52150710540)
上海市浦江人才计划(21PJD047)资助。
关键词
地震载荷
拘束效应
异种金属焊接接头
断裂行为
竖向地震
Earthquake load
Constraint effect
Dissimilar metal welded joint
Fracture behavior
Vertical earthquake
作者简介
袁宏伟,男,1999年7月生,河南扶沟人,汉族,上海理工大学硕士研究生,主要研究方向为机械强度。;杨杰,男,1987年1月生,山东东明人,汉族,上海理工大学副教授,博士,博士生导师,主要从事机械强度、断裂力学等方面的教学与研究工作。
