Abstract
The technique of retarding the growth of fatigue cracks by drilling holes on the crack tip is well known. Most of the research works on this subject are limited to fatigue cracks subjected to mode I loading conditions. In the present work the fatigue crack growth retardation by stop-holes of cracks under mode I+II loading is investigated. The proposed approximate solution is based on the implementation of a mixed-mode fatigue crack growth model and a multiaxial high cycle fatigue criterion. Numerical results for mode I+II fatigue crack growth retardation on Al-2024 thin plate are derived and the effect of the crack inclination angle, as well as the diameter of the stop-hole, are discussed and commented.
Highlights
The technique of retarding the growth of fatigue cracks by drilling holes on the crack tip is well known
Since the structural integrity of aerospace structures is of vital importance for the aerospace industry (Mello Jr. and Mattos 2009; Mello Jr. et al 2009; Mattos et al 2009), the knowledge of the fatigue crack growth retardation due to stop-holes is important to improve the inspection plans
Since the criterion of the minimum potential energy is not based on an assumption but on a physical principle, it has been selected in the present study as a tool for studying the effect of stop-holes on mode I+II fatigue loading conditions
Summary
The technique of retarding the growth of fatigue cracks by drilling holes on the crack tip is well known. Unlike the mode-I cracks, the stress state of a point A on the perimeter of the stop-hole is multiaxial (Fig. 2).
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