Discussion
Assertion (A): Ply drop-offs are staggered rather than terminated together.
Reason (R): Terminating several plies at one station concentrates the interlaminar stress there.
Select the correct answer from the options below.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is the design rule. Where a ply terminates, the load it carried must be shed into its neighbours through interlaminar shear, and ending several plies at the same station concentrates that shear and creates a resin pocket. Staggering the drop-offs spreads the transfer over a length and keeps the interlaminar stress within what the matrix can carry.
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