摘要
介绍了近年来进行的Ａ５３７钢在３．５％ＮａＣｌ水溶液中阳极溶解与阴极充氢条件下腐蚀疲劳裂纹扩展中载荷交互作用方面的一些研究结果．其中包括恒ΔＫ控制下的单周超载延迟作用，裂纹扩展率的波型响应以及小幅载荷的幅度与相对主载荷的位置对裂纹扩展的影响规律等．并介绍了激光散斑技术在研究不同条件下裂尖材料局部形变与裂纹闭合规律中的应用．结果表明，腐蚀因素造成疲劳载荷间交互作用机制发生重要变化，阳极溶解与氢脆条件下呈现不同规律．根据裂尖形变与裂纹闭合的原位测量结果，对不同条件下的载荷交互作用机制进行了讨论．这种机理对腐蚀疲劳条件下实验室简化载荷谱的建立具有重要意义．
A fundamental problem in corrosion fatigue(CF) life prediction under random loading conditions is to clarify the difference of damage process for crack tip material between corrosion fatigue and dry fatigue, and it is the basis for the establishment of fatigue cumulative damage model. Some research results are presented in this paper on the interaction of loads with different amplitudes during CF crack growth for A537 steel in 3.5%NaCl solution under anodic dissolution and hydrogen embrittlement conditions, including the crack growth retardation effect after a single overloading under constant ΔK control, response of crack growth to loading waveforms and the effect of small amplitude loads on CF crack behavior et cetera. The application of the Laser Speckle Interferometry (SPI) technique in studing the crack closure and localized deformation of crack tip material is described. The results showed that corrosion factors caused an important change of load interaction mechanism and this change of the mechanism is quite different for anodic dissolution and hydrogen embrittlement conditions. The load interaction mechanism is discussed according to the SPI in-situ measurement results of crack tip deformation and crack closure.
出处
《腐蚀科学与防护技术》
CAS
CSCD
1999年第2期117-117,共1页
Corrosion Science and Protection Technology
基金
国家自然科学基金
