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Which of the following expressions most ac curately and simply represents the comple mentary strain energy density Uc of a linear elastic material?

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Extend definition to material bodies: total work is the addition of the work done on all particles by forces distributed over the volume W by forces distributed over the surface t·udS

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美国麻省理工大学：《结构分析与设计技术》教学资源（讲义）notes122