Abstract: Overall discussion of basic
characteristics of fatigue process; irreversible damage process,
stochastic and probabilistic character and field effect (size
effect). Basic assumptions of PFDM (Probabilistic Fatigue Damage
Mechanics); isotropy of material, homogeneous distribution of
natural damage before loading, and evolution model of mechanical
damage. Study of basic element (dxdydz) on its physical
background and mechanism; form of damage parameters, damage
equation, failure state equation, probabilistic expression of
fatigue damage for constant amplitude loading. Using "Weakest
Link Theory" of unequal strength the expression of fatigue
probabilistic damage of definite field or structural component
has been derived. Some examples are given in present paper,
theoretical and experimental forms of distribution are compared.
Key words:
Fatigue Damage Mechanics Probabilistic
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The Project
Supported by National Natural Science Foundation of China
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