Corrosion Pit Induced Stresses Prediction from SEM and Finite Element Analysis

Corrosion Product Film-Induced Stress Facilitates Stress Corrosion Cracking

“…However, this understanding can be improved using the finite element method (FEM), which has become an accepted analysis technique in many areas of engineering and enables stress and strain analyses to be accurately performed compared with existing classical theoretical methods. The application of the FEM in corrosion research and crack simulation has gained popularity 21 22 23 24 25 26 27 28 .…”

“…Regarding pitting, Turnbull et al 21 conducted a finite element analysis to evaluate the stress and strain distribution associated with a single corrosion pit in a cylindrical steel specimen that was remotely stressed in tension. Pidaparti et al 22 23 employed FEM to simulate the morphology and predict the stress buildup created by pits; the results indicated that the stress is responsible for possible crack nucleation. For crack initiation in a corrosion field, Wenman et al 25 employed the FEM to correlate real transgranular stress corrosion cracks grown in a boiling MgCl 2 environment and offered explanations for observed morphologies to support proposed crack growth models of this system.…”

Effect of Pre-Corrosion Pits on Residual Fatigue Life for 42CrMo Steel

“…In recent years, fatigue performance of pre-corroded metallic alloys has been studied extensively. For example, recent works [13,14,15,16,17,18] have reported the description of the stress concentration arising from corrosion pits based on the finite element (FE) method. Sharland [13] developed a mechanistic model of the propagation stage of an established pit or crevice to simulate the evolution of pit geometry and to describe the corrosion process.…”

“…Through the use of interaction function to simulate the effect of the corrosion potential and corrosion current density on the corrosion process, Xu [15] developed an FE model for the simulation of the mechanoelectrochemical effect of pipeline corrosion. Because the fatigue strength of the metallic alloys decreases differently under the different corrosion depths and stress amplitudes [16], Pidaparti [17] established a new FE model to investigate the stress state around corrosion pits. However, the proposed FE model in [17] cannot be used to depict the growth process of corrosion pits with time.…”

“…Because the fatigue strength of the metallic alloys decreases differently under the different corrosion depths and stress amplitudes [16], Pidaparti [17] established a new FE model to investigate the stress state around corrosion pits. However, the proposed FE model in [17] cannot be used to depict the growth process of corrosion pits with time. Through the use of the damage tolerance method to predict the corrosion fatigue life for 7075-T6 stainless steel, Huang [18] indicted that the nucleation time of pits and the material constant of crack propagation can affect the residual fatigue life of stainless steel significantly.…”