CAJ | 학술논문

服役环境中的腐蚀介质会在铝合金表面形成以腐蚀坑为代表的典型点蚀形貌。在疲劳载荷作用下，这些腐蚀坑会有助于裂纹的萌生，加速并影响其扩展行为，威胁结构安全。考虑腐蚀坑的影响，建立了一个基于腐蚀损伤表征参数的线弹性裂纹扩展表征模型。利用航空结构中常见承力构件所采用的LD2铝合金进行验证性实验。结果表明，所建立的模型能够反映出腐蚀损伤对于裂纹扩展行为的影响，对于铝合金构件的腐蚀疲劳寿命预测和损伤容限评估具有参考价值。
복역배경중적부식개질회재려합금표면형성이부식갱위대표적전형점식형모。재피로재하작용하，저사부식갱회유조우렬문적맹생，가속병영향기확전행위，위협결구안전。고필부식갱적영향，건립료일개기우부식손상표정삼수적선탄성렬문확전표정모형。이용항공결구중상견승력구건소채용적LD2려합금진행험증성실험。결과표명，소건립적모형능구반영출부식손상대우렬문확전행위적영향，대우려합금구건적부식피로수명예측화손상용한평고구유삼고개치。
Pit corrosion morphology prevails on aluminum alloy surface when subjected to corrosive media in service environment, which will favor crack initiation and accelerates crack propagation behavior, thus it threatens the engineering structure safety. This paper establishes a linear elasticity fatigue crack characterizing with respect to pit corrosion parameter and verify the validity of the proposed model by experimental data from prior-corrosion fatigue test of aluminum alloy. The proposed model is of reference value for corrosion fatigue life and damage tolerance evaluation of aluminum alloy structure.