In this article, three classes of criteria (stress-strain, energy, and critical plane) used for life estimation in multiaxial high-cycle fatigue are discussed with emphasis on nonproportional loading, and the merits or demerits of each fatigue criterion are indicated. This paper also reviews mechanisms of multiaxial high-cycle fatigue, especially under nonproportional loading, and introduces studies in China on micromechanisms in high-cycle fatigue under multiaxial loading. Suggestions for further work are proposed in the conclusions.
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