Affordable Access

Publisher Website

The merging of fatigue and fracture mechanics concepts: a historical perspective

Authors
Journal
Progress in Aerospace Sciences
0376-0421
Publisher
Elsevier
Publication Date
Volume
34
Identifiers
DOI: 10.1016/s0376-0421(98)00006-2
Disciplines
  • Design
  • Engineering
  • Physics

Abstract

Abstract In this review, some of the technical developments that have occurred during the past 40 years are presented which have led to the merger of fatigue and fracture mechanics concepts. This review is made from the viewpoint of “crack propagation”. As methods to observe the “fatigue” process have improved, the formation of fatigue micro-cracks have been observed earlier in life and the measured crack sizes have become smaller. These observations suggest that fatigue damage can now be characterized by “crack size”. In parallel, the crack-growth analysis methods, using stress-intensity factors, have also improved. But the effects of material inhomogeneities, crack-fracture mechanisms, and nonlinear behavior must now be included in these analyses. The discovery of crack-closure mechanisms, such as plasticity, roughness, and oxide/corrosion/fretting product debris, and the use of the effective stress-intensity factor range, has provided an engineering tool to predict small- and large-crack-growth rate behavior under service loading conditions. These mechanisms have also provided a rationale for developing new, damage-tolerant materials. This review suggests that small-crack growth behavior should be viewed as typical behavior, whereas large-crack threshold behavior should be viewed as the anomaly. Small-crack theory has unified “fatigue” and “fracture mechanics” concepts; and has bridged the gap between safe-life and durability/damage-tolerance design concepts.

There are no comments yet on this publication. Be the first to share your thoughts.

Statistics

Seen <100 times
0 Comments

More articles like this

Application of fracture mechanics concepts in ultr...

on Engineering Fracture Mechanics Jan 01, 1994

Prediction of the fatigue life of slender web plat...

on Thin-Walled Structures Jan 01, 1999

Fatigue and fracture mechanics

on Engineering Fracture Mechanics Jan 01, 1973

Fatigue life prediction of notched members based o...

on Engineering Fracture Mechanics Jan 01, 1983
More articles like this..