The endurance limit is usually about:

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The endurance limit is usually about:
A . 10-20% of a material’s ultimate tensile strength.
B . 40-50% of a material’s ultimate tensile strength
C . 10-20% of a material’s yield strength.
D . 40-50% of a material’s yield strength.
E . Half way up the ladder of a 150’ column (tower).

Answer: B