Finite element visualization of fatigue crack closure in plane stress and plane strain

Literature review of fatigue assessment methods in residual stressed state

“…Five distinct sources of crack closure were identified: plasticity, oxide, roughness, viscous fluid, and phase transformation [50] Crack closure is more present in plane stress conditions than in plane strain conditions [51,52,53] Physically-short crack growing from a notch does not initially exhibit crack closure, resulting in higher crack growth rates [49] Overload crack growth delayed retardation can be understood with temporary removal of crack closure due to crack tip blunting [49,54] Finite element analyses suggest that different standard crack growth test specimen exhibit different degrees of crack closure [55] The magnitude of crack closure can be experimentally determined using compliance techniques, crack propagation techniques, and non-mechanical contact measurements [49]. Another way of determining the amount of crack closure is through Finite Element Analysis (FEA).…”

“…Another way of determining the amount of crack closure is through Finite Element Analysis (FEA). McClung and Sehitoglu [53,56] wrote an early review of the modeling. Pommier and Bompard [57] studied the effect of Bauschinger effect on the plasticity-induced crack closure and concluded that there was a strong interaction between the material's cyclic plastic behavior and the observed stress ratio, overload and underload effects.…”

A Study on Fatigue Crack Closure Associated with the Growth of Long Crack in a New Titanium Alloy

“…However, as the element size decreases, the computational cost required for crack expansion increases significantly. Therefore, the grid size of 0.0125 mm is applied in this paper, which not only satisfies the division of the plastic zone by McClung [30] and reflects the mechanical state of the crack tip better but also shortens the computational time, and saves the computational cost.…”

Experimental and computational studies of load ratio effect on fatigue crack growth rates in Alloy 709 at elevated temperatures

“…Crack closure due to plasticity has been extensively studied using finite element simulations of fatigue crack growth in twodimensional models for both plane strain and plane stress cases. [9][10][11][12][13] While there are numerous finite element studies of fatigue crack growth with the consideration of plasticity-induced crack closure, 11,14-18 significantly less attention has been dedicated to this phenomenon in the context of predicting FCG rates in steels at high temperatures. Even though FCG rates that include the R ratio effect have been widely studied particularly in the nearthreshold regime, [19][20][21][22][23] experimental and numerical characterizations of FCG rates at temperatures above 550 C in Alloy 709 are sparse.…”