Multiaxial Fatigue and Fracture: A Literature Review
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Published: 1984
Total Pages: 80
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DOWNLOAD EBOOK →Problems often arise when attempting to determine the fatigue behaviour of structural components from laboratory data. A major reason for this lack of correlation is that most engineering components operate in stress environments significantly more complicated than uniaxial tension, the stress state in which most research studies are conducted. A review of the literature has shown that virtually all fatigue and fracture properties of metals and components are affected by multidirectional loading. In particular, variations in stress state compared with uniaxial tension produce the following effects: a) decreases in the fatigue limit by up to approximately 50%; b) increases or decreases in low-cycle fatigue life by factors of up to 20, depending on whether the stress in the second direction is tensile or compressive and is static or cyclic; c) out-of-phase loading also reduces the low-cycle fatigue life by a factor of up to 4 compared with in-phase loading; and d) acceleration and retardations of fatigue crack growth rates by factors of 3 to 4 depending on the nature of the transverse stress. It is also evident that multiaxial criteria used for design purposes can be non-conservative, especially under out-of-phase loading, and consequently can lead to unsafe estimates of the fatigue life of a component. Originator supplied keywords include: Multiaxial stress; Low cycle fatigue; Fracture properties; Fatigue tests; Crack propagation; Metal fatigue.
