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Just curious, when we talk about poissons ratio and saying that strain y = posissons ratio times strain x, does that still apply when the axial strain is downward, just flipped? like really the formula is lateral strain = poissons ratio * (axial strain). correct?
This formula is true is the axial strain flips its sign, however, it's correct only if it's a uniaxial load in which you have a single load. For multiple load problems, it is not applicable.