Yes, this would be correct for cross sectional area. The strength of the journal in tension is proportional to the cross sectional area. However, for a crankshaft, strength in torsion and strength in bending are more important than strength in tension.
If I could repeat your calculations for clarity: The cross sectional area is proportional to the diameter raised to the second power (diameter squared). For a 3" journal we have 3^2 = 9 and for a 3.5" journal we have 3.5^2 = 12.25. 12.25 divided by 9 = 1.361; increase in strength in tension.
The strength of the journal in torsion and in bending is proportional to the journal diameter raised to the fourth power. For a 3" journal we have 3^4 = 81 and for a 3.5" journal we have 3.5^4 = 150.06. 150.06 divided by 81 = 1.85; increase in strength in torsion and bending.
In conclusion the 3.5" journal is nearly double in stength for the more important torsion and bending modes.
With all respect - hopefully this adds to your post. Ken
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