摘要
裂尖力学状态是影响结构材料应力腐蚀开裂(SCC)扩展速率的主要因素之一,针对氧化膜应力对不同时期裂纹尖端产生的力学规律,建立了SCC寿命周期有限元模型,得出氧化膜在不同裂纹扩展阶段裂尖力学场的变化。结果表明,在表面划痕开裂阶段,氧化膜对裂尖Mises应力及拉伸应力的影响最大,对裂尖的作用范围的影响则较小;随着开裂长度的增加,氧化膜对裂尖Mises应力、拉伸应力及应力强度因子K的影响越小。
The tip mechanical state is one of the main factors affecting the rate of stress corrosion cracking(SCC)expansion of structural materials.According to the mechanical law of oxide stress on crack tip in different periods,the SCC life cycle finite element model was established and the oxide film was obtained with the change of the mechanical field of the crack tip in different crack propagation stages.The results showed that the crack was in the scratch stage,the oxidation film had the greatest influence on the failure stress and tensile stress,but appeared small influence range on the crack tip.With the increase of crack length,the influence of oxide on Misses stress,tensile stress and stress intensity factor K of crack tip was smaller.
作者
杨帆
孙剑伟
张文娟
Yang Fan;Sun Jianwei;Zhang Wenjuan(Xi’an Aeronautical Polytechnic Institute,Xi’an 710089,China;Xi’an University of Science and Technology,Xi’an 710054,China)
出处
《焊接》
2020年第12期27-29,34,62,63,共6页
Welding & Joining
基金
陕西省教育厅一般专项科学研究项目(20JK0701)。
