A. never achieve a point of zero stress
B. have circumferential stress equal to 2x the longitudinal stress
C. have circumferential stress equal to 2x the axial stress
D. are equal in both directions
Answer is D. equal in both directions (this is akin to soap bubbles-spherical membranes).
Statement A is used to describe the stress-strain curve in animal tissue (veins, arteries). B describes the skin of a cylinder (or pipes). C describes a characteristic of rubber-like materials (rubber tubes).
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