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Fracture morphologies and failure mechanism of TC4 alloy blades of aeroengine damaged by soft/hard object impact
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Fracture morphologies and failure mechanism of TC4 alloy blades of aeroengine damaged by soft/hard object impact
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Journal Article
Fracture morphologies and failure mechanism of TC4 alloy blades of aeroengine damaged by soft/hard object impact
2025
Overview
In this paper, the differences in macroscopic and microscopic fracture morphology of TC4 alloy blades damaged by soft/hard object impact were quantitatively studied. The results show that the crack length formed by a hard object impact is 2.83 mm, which is much smaller than that of a soft object impact. Meanwhile, a secondary crack perpendicular to the main crack tip is also formed by hard object impact. The scanning electron microscope (SEM) fracture morphology images of the cracks induced by hard object impact are mainly characterized by a large number of ductile dimples and a small amount of smooth areas. Instead, the fracture surface formed by soft object impact also exhibits fracture morphology characteristics of shear dimples and tear ridges. The quantitative characterization results of the dimple morphologies indicate that there is no significant difference in the mean diameter of dimples in different regions of cracks formed by hard object impact, while dimples formed by soft object impact exhibit inverse function distribution characteristics. The crack path is induced by hard object impact, which forms a crack bifurcation at the crack tip, causing a pronounced brittle fracture. In contrast, the crack propagation path resulting from soft object impact exhibits deflection at a shallower angle, leading to quasi-cleavage fracture.
Publisher
IOP Publishing
