Wang Wenwen, Zhang Zhiliang, Ren Xuechong, Guan Yongjun, Su Yanjing
Corrosion and Protection Centre, Key Laboratory for Environmental Fracture (MOE), University of Science and Technology Beijing, Beijing 100083, China.
Department of Structural Engineering, Norwegian University of Science and Technology (NTNU), Richard Birkelands vei 1a, N-7491 Trondheim, Norway.
Sci Rep. 2015 Jun 11;5:10579. doi: 10.1038/srep10579.
Finite element analyses were conducted to clarify the role of corrosion product films (CPFs) in stress corrosion cracking (SCC). Flat and U-shaped edge-notched specimens were investigated in terms of the CPF-induced stress in the metallic substrate and the stress in the CPF. For a U-shaped edge-notched specimen, the stress field in front of the notch tip is affected by the Young's modulus of the CPF and the CPF thickness and notch geometry. The CPF-induced tensile stress in the metallic substrate is superimposed on the applied load to increase the crack tip strain and facilitate localized plasticity deformation. In addition, the stress in the CPF surface contributes to the rupture of the CPFs. The results provide physical insights into the role of CPFs in SCC.
进行了有限元分析，以阐明腐蚀产物膜（CPF）在应力腐蚀开裂（SCC）中的作用。针对平面和U形边缘缺口试样，研究了CPF在金属基体中引起的应力以及CPF中的应力。对于U形边缘缺口试样，缺口尖端前方的应力场受CPF的杨氏模量、CPF厚度和缺口几何形状的影响。CPF在金属基体中引起的拉应力叠加在施加的载荷上，以增加裂纹尖端应变并促进局部塑性变形。此外，CPF表面的应力会导致CPF破裂。这些结果为CPF在SCC中的作用提供了物理见解。
