Effect of tensile stress response for oxide films on the fatigue failure behavior of anodized AA6082 alloys

Fatigue Resistance of an Anodized and Hardanodized 6082 Aluminum Alloy Depending on the Coating Thickness in the High Cycle Regime

“…This damage mechanism is in line with our observations for the anodized samples. However, in our case, the critical stress value determined by Zhu et al [45] is not reached for any tested coating thicknesses. We assume this might be an effect of the used specimen geometry and size as well as the used load ratio.…”

“…We assume this might be an effect of the used specimen geometry and size as well as the used load ratio. In contrast to Zhu et al, [ 45 ] which tested at 0.1, we determined the fatigue strength at alternating tension–compression loading, which may lead to a more pronounced coating shattering due to the added compression loading. Further, the tested oxide coatings in their study were hydrothermally sealed, which can also have a major influence on the fatigue resistance.…”

“…On the fracture surface, this is expressed by one single crack front for the anodized specimens, which was also observed in other own studies. [21,22] Zhu et al [45] demonstrated in in situ tensile and fatigue tests that a critical value for the cracking of the oxide coatings exists. They determined a critical stress of 157 MPa for a 20 μm thick anodic coating.…”

Study on tribological oxide mechanism of CoCrFeNiMo high entropy alloy

“…According to this result, oxide film can't be formed under 2 N load, but it will be formed under 10 N load. For oxide film, fracture is related to the maximum tensile stress (the first strength theory) [47] . Figure 13 (c) and Figure 13 (d) illustrate that the surface in front of the ball is subject to compressive stress, while tensile stress is located at the surface behind the ball and its direction is parallel to the sliding direction.…”

Interfacial Stress Analysis of PVD Thin Film Sensor Based on Finite Element

“…To keep the mesh consistent, one mesh element per micron of thickness is divided along the film thickness. Altering the Poisson's ratio of the matrix or the film material does not affect the interface stress of the film base [25,26]. Therefore, the difference in Poisson's ratio is ignored in this research, and the elastic modulus of thin film material is treated as the only variable.…”