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The total volume of a foamed material decreases when it plastically deforms in tension.
A. What does this imply about the effect of σH = (σ1 + σ2 + σ3)/3 on the shape of the yield surface in σ1, σ2, σ3 space?
B. Would the absolute magnitude of the yield stress in compression be greater, smaller, or the same as the yield strength in tension?
C. When it yields in compression, would the volume increase, decrease, or remain constant?
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