蠕变氧化交互下裂纹扩展行为的数值分析  

Numerical Analysis on Creep-Oxidation Interaction of Crack Growth Behavior

作　　者：谈建平[1] 闫阿晨 曾鑫 刘长军[1] 蔡君 苏东川[2] 邵雪娇[2] TAN Jianping;YAN Achen;ZENG Xin;LIU Changjun;CAI Jun;SU Dongchuan;SHAO Xuejiao(School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China;Nuclear Power Institute of China,Chengdu 610213,China)

机构地区：[1]华东理工大学机械与动力工程学院,上海200237 [2]中国核动力研究设计院,成都610213

出　　处：《华东理工大学学报（自然科学版）》2022年第6期856-862,共7页Journal of East China University of Science and Technology

基　　金：国家自然科学基金青年科学基金(11502082);国家自然科学基金面上基金(52075174)。

摘　　要：为研究氧敏感材料在蠕变氧化交互下裂纹扩展行为的变化规律,基于动态脆化物理机制,建立了蠕变耦合氧化损伤的数学模型,利用Abaqus和Voronoi图技术进行了镍基合金蠕变氧化裂纹扩展数值模拟,分析了载荷水平、初始裂纹处晶界方向、氧扩散速率和蠕变性能对裂纹扩展行为的影响。结果表明:当载荷较小时,氧化促进效应显著;随着载荷的增加,逐渐趋于蠕变主导裂纹扩展。由于氧更易扩散,直晶界裂纹相较于斜晶界裂纹的起裂时间更短。随着氧扩散速率的增大,裂纹起裂时间缩短,且载荷越大直晶界裂纹的起裂时间越趋于稳定。蠕变本构参数对裂纹起裂时间随载荷的变化规律几乎没有影响,越难发生蠕变的材料或服役条件,氧对断裂的影响越大。In order to study the variation of the crack growth behavior of oxygen-sensitive materials under the interaction of creep-oxidation,the physical mechanism of dynamic embrittlement was used to establish a mathematical model of creep coupled oxidation damage.The creep-oxidation crack growth of nickel-based alloy was analyzed by Abaqus and Voronoi diagram techniques.Meanwhile,the effects of load level,grain boundary direction at initial crack,oxygen diffusion rate and creep properties on crack growth were analyzed.The results showed that the oxidation promotion effect was significant when the load was small.With the increase of load creep gradually tended to dominate.Since oxygen was easier to diffuse,the crack initiation time of straight grain boundary cracks was shorter than that of oblique grain boundary cracks.As the oxygen diffusion rate increased,the crack initiation time decreased,and the increase of load would cause the crack initiation time of the straight grain boundary cracks to stabilize.Creep constitutive parameters had almost no effect on the law of crack initiation time with load.The more difficult the materials or service conditions are to creep,the more obvious the effect of oxidation is.

关 键 词：裂纹扩展 蠕变氧化交互 动态脆化 有限元 镍基合金 

分 类 号：TG132.32[一般工业技术—材料科学与工程]