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This chapter introduces the concept of work and, based on this, presents the principle of virtual displacements, which is of fundamental importance for applied mechanics and has a number of interesting applications. The concepts of potential and potential forces are then introduced and we also analyse non-rigid systems. The chapter concludes with a consideration of the concept of stability, and we will analyse how the stability of equilibrium positions can be classified. In addition, we will conclude with the determination of so-called influence lines for forces and moments on static systems.

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Work

  • 章节

  • 发表日期：

    2026年

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  • Christian Mittelstedt

摘要

This chapter introduces the concept of work and, based on this, presents the principle of virtual displacements, which is of fundamental importance for applied mechanics and has a number of interesting applications. The concepts of potential and potential forces are then introduced and we also analyse non-rigid systems. The chapter concludes with a consideration of the concept of stability, and we will analyse how the stability of equilibrium positions can be classified. In addition, we will conclude with the determination of so-called influence lines for forces and moments on static systems.