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Based on that hoary schematic cube representation in 3D for stress-strain relationship. Stress tensor {σxx, σyy, σzz, σxy, σyz, σzx} and strain tensors {εxx, εyy, εzz, εxy, εyz, εzx} can be written interchangably. Let's suppose that σzz=σzx=σzy=0 then the reamining terms are written in matrix form then how that E/(1-v^{2}) coefficient is emerging.

At first sight, is seems that its very simple to express it by multipliers but couldn't figured out .

Any help please,

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# 3D stress -strain relationship

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