Discussion
Assertion (A): Treating every fastener as a rigid connection is a safe simplification.
Reason (R): A fastener has finite stiffness and allows some relative movement between the parts.
Select the correct answer from the options below.
Answer: D
The assertion is false and the reason is true. Rigid connections stiffen the model and misdistribute the load between parts, sometimes unconservatively. Calibrated spring elements reproduce the real joint flexibility at very little cost.
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