Abstract
This chapter derives the fundamental equations of continuum mechanics and the nonlinear theory of elasticity. Topics include the description of motion of particles and continua; analysis of deformation and stress; balance of mass, momentum, and energy; the entropy inequality; and constitutive relations. To facilitate understanding of the basic concepts, equations are developed in one, two, and three dimensions.
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Notes
- 1.
Since this book focuses primarily on elastic solids, some formulas that may be useful for fluid mechanics are omitted.
- 2.
Some authors use the alternative notation D∕Dt for the material time derivative to emphasize that the derivative follows the motion of a particle in a continuum.
- 3.
For convenience, in the remainder of this book, the time variable is dropped from all equations unless it is needed for clarity or if the analysis is explicitly time-dependent. Consequently, we write x(X) instead of x(X, t). For example, in the problem discussed in Sect. 3.2.1, the motion of the bar is described by x(X, t) = X(1 + αt 2). If we set \(\bar {\alpha }(t)=\alpha t^2\), then \(x(X)=X (1+\bar {\alpha })\) gives a snapshot of the bar at an instant in time, as defined by the value of the new parameter \(\bar {\alpha }\).
- 4.
For x << 1, \(\sin x \cong x\).
- 5.
The left Cauchy-Green deformation tensor, defined as B = F⋅F T, is not used in this book.
- 6.
Some authors define P T as the first Piola-Kirchhoff stress tensor.
- 7.
It is important to remember that the equation of motion involves the summation of forces, not stresses.
- 8.
Similar difficulties are encountered with some theories for remodeling (see Chap. 7).
- 9.
Lagrange multipliers are used in optimization problems to enforce constraint conditions (Belytschko et al. 2000).
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Taber, L.A. (2020). Continuum Mechanics and Nonlinear Elasticity. In: Continuum Modeling in Mechanobiology. Springer, Cham. https://doi.org/10.1007/978-3-030-43209-6_3
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