a) σ=[σy,σz,Tyz,σθ]T
b) σ=[σy,σz]T
c) u=[u, w]T
d) T=[Ty,Tz]T
Answer: a
Explanation: The stress is expressed by the Cauchy traction vector T defined as the traction force F between adjacent parts of the material across an imaginary separating surface S, divided by the area of S.
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