The shape factor for a solid circular cross-section in plastic design is:
A1.70
B2.00
C1.15
D1.50
Explanation
Shape factor (S = Zp / Ze) represents reserve plastic strength after yield. For a solid circular cross-section, plastic section modulus Zp = d^3 / 6 and elastic modulus Ze = π * d^3 / 32, giving Shape Factor S ≈ 1.70.
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