What is R curveand the condition for crack  instability?

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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What is R curveand the condition for crack  instability?

 

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Explanation:

R curve stands for crack-extension resistance curve or resistance curve. This curve formed by residual-strength  of the specimen. This curve gives the additional information as compare to simple test.  This curve is used to determine the failure load of the complicated shaped structures of the same material and thickness.

There is relation between crack-tip stress intensity factor and crack growth under raising load. This relationship is known as the R-curve. This gives the response of the material near the crack tip. 

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