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Fatigue Crack Propagation Analysis in ANSYS

This presentation provides an overview of how to perform a Fatigue Crack Growth Analysis in ANSYS.

Fatigue crack formation analysis predicts cycles to failure based purely on material data of fatigue specimens. Even though the total fatigue life includes the growth of cracks, cracks are not explicitly modeled.

Fatigue performance of structures is more accurately described as follows:

The presence of stress risers such as holes, manufacturing errors, corrosion pits, and maintenance damage serve as nucleation sites for fatigue cracking. During service, sub-critical cracks nucleate from these sites and grow until catastrophic failure, i.e. unstable crack growth, occurs. From an economic point of view, a costly component cannot be retired from service simply on detecting a fatigue crack. Hence, reliable estimation of fatigue crack propagation and residual life prediction, combined with inspections, are essential so that the component can be timely serviced or replaced.

This presentation was originally given as part of the Fatigue & Fracture Using Finite Elements seminar on September 29, 2011 in Tarrytown, NY.  For further information please contact our office at (203) 758-2914.