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Material Fatigue
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Fretting Fatigue
A special type of fatigue that occurs at contact areas between materials under load where micro-vibrations or slight movements cause wear and can initiate cracks - Important for joint interfaces in structures.
High-Cycle Fatigue
A type of fatigue that occurs under relatively low loads but high numbers of cycles, typically above 10^4 cycles - Important for designing elements subjected to large numbers of cycles.
Thermal Fatigue
Fatigue failure resulting from cyclic thermal stresses due to fluctuating temperatures - Essential for materials selection in components subjected to thermal cycling.
Crack Initiation
The phase in the fatigue process where microscopic cracks begin to form, often due to stress concentrations - Understanding it helps in improving fatigue life through design modifications.
Crack Propagation
The phase in the fatigue process where existing cracks grow due to the cyclic loading - Monitoring and controlling it is key to preventing catastrophic failure.
Paris' Law
An empirical equation describing the rate of fatigue crack growth rate, given as - It helps predict the life expectancy of a cracked part under cyclic loading.
Low-Cycle Fatigue
A type of fatigue occurring under high loads and low number of cycles, typically below 10^4 cycles - Relevant to components that encounter large stresses for a short duration.
Fatigue Strength
Stress level at which a material can survive a specified number of cycles before failing - Critical for designing durable components subjected to fluctuating stresses.
S-N Curve
A graph representing the relationship between cyclic stress (S) and the number of cycles to failure (N) - Essential for understanding the fatigue behavior of materials.
Beachmarks
Lines on the surface of a fractographic fatigue specimen that indicate the position of the crack front at various instances - Useful for understanding the crack growth history.
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