Introduction to practical FEA-2

A: A: Chlorides plus cyclic stress equals pits turning into fatigue starters. That's the life limiter here. B: Even wall loss doesn't match splash exposure or observed field failures. C: Temperature never gets near the oxidation regime for aluminum alloys. D: SCC needs the wrong chemistry and a static stress state; neither is present.

A: A: Loss of clamp load lets micro-slip start; fretting then eats fatigue life. B: Joints don't teleport apart; there's a load path and friction margin. C: No current path here, so resistance is irrelevant. D: Embrittlement is an upstream material/process issue, not a consequence of preload loss.

A: A: Connector stiffness tuned to test data keeps stress flow realistic and run time sane. B: Plasticity detail doesn't help high-cycle fatigue and kills solver time. C: Rigid links erase load redistribution and spike stresses elsewhere. D: Node merging over-stiffens the joint and inflates fatigue life.

A: A: Moisture hits the resin first; shear and compression go soft. B: Fibers don't care about chlorides in this setup. C: Salt doesn't soak in and add mass uniformly. D: UV damage is a surface effect and slow, not instant delam.