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Stress concentration factors in countersunk holes

Published online by Cambridge University Press:  04 July 2016

J. B. Young and
K. K. Lee
J. B. Young
Affiliation:
College of Aeronautics, Cranfield University
K. K. Lee
Affiliation:
College of Aeronautics, Cranfield University
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Extract

The use of finite element analysis in the modelling of an unloaded countersunk hole revealed that there is a consistent relationship between the maximum stress concentration factor and the design parameters of the hole — countersunk depth, edge distance, t/d ratio and countersunk angle. It has been shown that countersunk depth and edge distance have a strong influence on the Kt value while the t/d ratio has a lesser effect. Variation of countersunk angles between 90° and 110° was found to have a negligible influence on the maximum Kt values.

It has also been shown that normalising the stress concentration factors of a countersunk hole by dividing the Ktvalues at various countersunk depths by the Ktvalues for a plain hole of similar configuration, enables the stress concentration factors in a countersunk hole to be determined from values in a plain hole. This is very useful since extensive work had been done on stress concentration factors for a plain hole and data are therefore more commonly available.

Information

Type
Research Article
Information
The Aeronautical Journal , Volume 97 , Issue 968 , October 1993, pp. 267 - 276
Copyright
Copyright © Royal Aeronautical Society 1993 

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References

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