Fatigue Life Extension by Crack Repair Using Double Stop-Hole Technique

Majid Reza Ayatollahi; Nima Razavi; Christof Sommitsch; Christian Moser

doi:10.4028/www.scientific.net/MSF.879.3

Paper Titles

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Fatigue Life Extension by Crack Repair Using Double Stop-Hole Technique
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Revision of ISO 27306 for CTOD Toughness Correction for Constraint Loss
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HomeMaterials Science ForumMaterials Science Forum Vol. 879Fatigue Life Extension by Crack Repair Using...

Fatigue Life Extension by Crack Repair Using Double Stop-Hole Technique

Abstract:

Drilling holes in the vicinity of the crack tip turns the crack into a notch and reduces the crack tip stress intensity factor. In this paper, a new idea is used in which instead of a single hole, two symmetric and interconnected holes are drilled at the crack tip. The main concept of double stop-hole method is to reduce the stress concentration at the edge of stop-holes in the cracked structural elements. The double stop drill hole method can be used to increase the fatigue life of the cracked components. The fatigue crack growth retardation is examined using an experimental investigation coupled with a stress analysis on the efficiency of proposed double stop-holes. The distance between the hole centers is considered as the main parameter affecting the efficiency of this method. The results show that the fatigue life extension caused by the double stop-hole method is significantly more than the conventional single stop-hole method.

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Periodical:

Materials Science Forum (Volume 879)

Pages:

3-8

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.879.3

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Online since:

November 2016

Authors:

Majid Reza Ayatollahi*, Nima Razavi, Christof Sommitsch, Christian Moser

Keywords:

Crack Growth Retardation, Double Stop-Hole, Fatigue Crack Growth, Fatigue Crack Initiation

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* - Corresponding Author

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