美国麻省理工大学：《结构分析与设计技术》教学资源（讲义）CQ7.pdf_大学文库

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Which of the following expressions represents the rate of work done by the stresses during the deformation of a body of an arbitrary material?

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Concept question Which of the following expressions represents the rate of work done by the stresses during the deformation of a body of an arbitrary material? au / du ds+ Ou O na)·dS+/f at at (3) at at Eqn. (1) qn (2 Eqn. (3 E qn DKDU

˙ � � � � � � ++++ ++++ ++++ ++++ ++++ Concept Question ++++ ++++ ++++ ++++ ++++ Which of the following expressions represents the rate of work done by the stresses during the deformation of a body of an arbitrary material? V ∂u ∂t ∂u ∂t t · dS + f · dV (1) S S V ∂u ∂t ∂u ∂t (n · σ) · dS + f · dV (2) V σij�ijdV (3) V 1 2 ∂u ∂t · ∂u ∂t ρ dS (4) 1. ++++ Eqn.(1) 2. ++++ Eqn.(2) 3. ++++ Eqn.(3) 4. ++++ Eqn.(4) 5. ++++ DKDU

Answer The correct answer to the concept question is: 3 Eqn. 3)

++++ ++++ ++++ ++++ ++++ Answer ++++ ++++ ++++ ++++ ++++ The correct answer to the concept question is: 3. ++++ Eqn.(3)

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