Discussion
Assertion (A): A fatigue repair patch should not be made as stiff as possible.
Reason (R): An over-stiff patch attracts load and creates a concentration at its own boundary.
Select the correct answer from the options below.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Load flows to stiffness, so a patch much stiffer than the skin it repairs draws load into itself and dumps it back at its own boundary, creating a fresh concentration and simply moving the cracking outboard. A good repair is matched in stiffness and tapered at its edges to spread the transfer.
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