Fatigue Crack Growth Analysis Under Spectrum Loading in Various Environmental Conditions

Effect of saline corrosion environment on fatigue crack growth of 7475-T7351 aluminum alloy under TWIST flight loading

“…Studies show that for metallic alloys, particularly aluminum, a NaCl-based corrosive medium tends to promote both retardation and acceleration of crack growth [1,12,[14][15][16]. It has been found that the result of corrosion may induce not only crack tip closure but also embrittlement due to the entry of hydrogen into the interstices of the alloy.…”

“…It has been found that the result of corrosion may induce not only crack tip closure but also embrittlement due to the entry of hydrogen into the interstices of the alloy. The factor that will cause each of these two phenomena to predominate in fatigue crack propagation is the loading type, such as stress level, load ratio, constant or random amplitude, and frequency of testing [16,17].…”

Fatigue damage analysis: Issues and challenges

“…2 shows the evolution of a crack from a hole in a P-3 aircraft front spar, made of 7075-T651 alloy. Damage in such cases depends on mainly two factors: (1) loads that can be static, cyclic or random; and (2) environment that can be chemical or temperature or both. The question then is how to predict reliably the evolution of damage for such a component under service load?…”

“…3 [1] illustrates the crack growth life of an aircraft component due to predominantly compressiondominated loads vs predominantly tension-dominated loads. This variation can come from just the differences in the mode of loading at room temperature with $35%RH environment for a 7075-T651 alloy.…”

Load Spectrum and Fatigue Life Computer Analysis of Prestressed Concrete Bridges

“…Standard vehicle load spectrum and fatigue vehicle model, which are based on domestic traffic situation [6][7][8][9], are contained in their bridge design specifications. UK BS5400 specification provides a good example.…”