Dynamic Strain Evolution around a Crack Tip under  Steady- and Overloaded-Fatigue Conditions

Lee, Soo Yeol; Huang, E-Wen; Woo, Wanchuck; Yoon, Chung Sik; Chae, Hobyung; Yoon, Soon Gil

doi:10.3390/met5042109

Cited by 29 publications

(6 citation statements)

References 18 publications

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“…The differences can be attributed to the interaction of overload and underload in the VAL, which resulted in higher fatigue life. Tensile overload in the Necking mark observed cycle caused crack retardation whereas compressive underload caused crack acceleration [18,31,32]. This study also found that ductility of aluminium alloy affected the load sequence effect.…”

Section: Methodssupporting

confidence: 55%

Influence of mechanical properties on load sequence effect and fatigue life of aluminium alloy

et al. 2017

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Most of the structural components in real applications are subjected to variable amplitude loading. The load sequence may have a significant effect on the number of cycles to failure. However, the relationship between the mechanical behaviour of material and the load sequence effects has scarcely been reported. Therefore, this paper discusses the influence of mechanical properties on the load sequence effect and fatigue life behaviour of aluminium alloys AA6061 and AA7075. Tensile and fatigue tests were performed according to ASTM E8 and ASTM E466, respectively. The variable amplitude loading signal was obtained from the engine mount bracket of an automobile in normal driving conditions. Constant amplitude loading, and high-to-low and low-tohigh spectrum loadings were derived from the variable amplitude loading to assess the effects of load sequence on fatigue life. The results showed that AA7075 has better fatigue life properties compared to AA6061. Both alloys were significantly influenced by load sequences. The number of cycles to failure for low-to-high spectrum loading is about 56 % higher than the CAL for AA6061 compared to about 82 % higher than the CAL for AA7075. Thus, it can be concluded that the load sequence effect was more pronounced on AA7075 compared to AA6061.

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Section: Methodssupporting

confidence: 55%

Influence of mechanical properties on load sequence effect and fatigue life of aluminium alloy

et al. 2017

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“…1c, the XRD pattern of the bare SS304L substrate exhibits diffraction peaks at around 2 θ = 43.8, 51.1, and 74.8°. 44 No diffraction peaks originated from SS304L, indicating no substrate trace in the CDI electrode. A typical broad peak near 2 θ = 26.6° was observed for the rGO powder and rGO/Ni–OH, rGO/Mn–OH, rGO/Co–OH, and rGO/NiMnCo–OH samples owing to the formation of oxygen-containing groups between the rGO sheets.…”

Section: Resultsmentioning

confidence: 99%

A 3D binder-free rGO/NiMnCo nanosheet for highly efficient hybrid supercapacitors and ion-selective capacitive deionization

Delfani,

Habibzadeh,

Pourdayan

et al. 2024

J. Mater. Chem. A

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“…angles with the notch direction. The solid materials, however, usually show straight crack pathways that are parallel to the notch direction [27][28][29][30]. In porous CT specimen extracted from foam panels made by traditional techniques (which usually have more non-homogenous microstructure compared to additively manufactured porous structures), the crack pathway was not straight and the main crack tip usually changed direction through the weakest path [31].…”

Section: Discussionmentioning

confidence: 99%

Fatigue crack propagation in additively manufactured porous biomaterials

Hedayati

Yavari

Zadpoor

2017

Materials Science and Engineering: C

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Additively manufactured porous titanium implants, in addition to preserving the excellent biocompatible properties of titanium, have very small stiffness values comparable to those of natural bones. Although usually loaded in compression, biomedical implants can also be under tensional, shear, and bending loads which leads to crack initiation and propagation in their critical points. In this study, the static and fatigue crack propagation in additively manufactured porous biomaterials with porosities between 66% and 84% is investigated using compact-tension (CT) samples. The samples were made using selective laser melting from Ti-6Al-4V and were loaded in tension (in static study) and tension-tension (in fatigue study) loadings. The results showed that displacement accumulation diagram obtained for different CT samples under cyclic loading had several similarities with the corresponding diagrams obtained for cylindrical samples under compression-compression cyclic loadings (in particular, it showed a two-stage behavior). For a load level equaling 50% of the yield load, both the CT specimens studied here and the cylindrical samples we had tested under compression-compression cyclic loading elsewhere exhibited similar fatigue lives of around 10 cycles. The test results also showed that for the same load level of 0.5F, the lower density porous structures demonstrate relatively longer lives than the higher-density ones. This is because the high bending stresses in high-density porous structures gives rise to local Mode-I crack opening in the rough external surface of the struts which leads to quicker formation and propagation of the cracks. Under both the static and cyclic loading, all the samples showed crack pathways which were not parallel to but made 45 angles with respect to the notch direction. This is due to the fact that in the rhombic dodecahedron unit cell, the weakest struts are located in 45 direction with respect to the notch direction.

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Dynamic Strain Evolution around a Crack Tip under Steady- and Overloaded-Fatigue Conditions

Cited by 29 publications

References 18 publications

Influence of mechanical properties on load sequence effect and fatigue life of aluminium alloy

Influence of mechanical properties on load sequence effect and fatigue life of aluminium alloy

A 3D binder-free rGO/NiMnCo nanosheet for highly efficient hybrid supercapacitors and ion-selective capacitive deionization

Fatigue crack propagation in additively manufactured porous biomaterials

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