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Fatigue (material)

In materials science, fatigue is the initiation and propagation of cracks in a material due to cyclic loading. Once a fatigue crack has initiated, it grows a small amount with each loading cycle, typically producing striations on some parts of the fracture surface. The crack will continue to grow until it reaches a critical size, which occurs when the…

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Overview

Stages of fatigue

Characteristics of fatigue

Timeline of research history

Predicting fatigue life

Dealing with fatigue

Fatigue of composites

Notable fatigue failures

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Fatigue (material)

Nodes183
Edges182
Triples28
Avg. degree1.99
Density0.010929
Components1

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Important terminology

fatigue stress failure crack cracks growth life used material loading due rate damage also may cycles materials surface fracture stresses

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
holesinstance ofmicroscopic cracks will begin to initiate at stress concentrations0.80text
persistent slip bandsinstance ofmicroscopic cracks will begin to initiate at stress concentrations0.80text
from an inclusion in the material or from a geometric stress concentrator caused by a sharp internal corner or fillet.Crack growthMost of the fatigue life is generally consumed in the crack growth phaseinstance ofPSB-induced surface slip can cause fractures to initiate.These steps can also be bypassed entirely if the cracks form at a pre-existing stress concentrator0.80text
mean stressinstance ofThe rate of growth is primarily driven by the range of cyclic loading although additional factors0.80text
environmentinstance ofThe rate of growth is primarily driven by the range of cyclic loading although additional factors0.80text
overloadsinstance ofThe rate of growth is primarily driven by the range of cyclic loading although additional factors0.80text
underloads can also affect the rate of growthinstance ofThe rate of growth is primarily driven by the range of cyclic loading although additional factors0.80text
the grain sizeinstance ofcracks are smaller than the material microstructure size0.80text
orcrack length is small compared to the plastic zone.Underloadsinstance ofcracks are smaller than the material microstructure size0.80text
from an inclusion in the material or from a geometric stress concentrator caused by a sharp internal corner or filletinstance ofPSB-induced surface slip can cause fractures to initiate.These steps can also be bypassed entirely if the cracks form at a pre-existing stress concentrator0.80text
the rainflow-counting algorithm.Stress-lifeinstance ofcomplex or variable amplitude loading is reduced to a series of fatigue equivalent simple cyclic loadings using a technique0.80text
strain-life methodsA mechanical part is often exposed to a complexinstance ofcomplex or variable amplitude loading is reduced to a series of fatigue equivalent simple cyclic loadings using a technique0.80text

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