This book provides novel insights into two fundamental subjects in solid
mechanics: virtual work and shape change. The author explains how the
principle of virtual work represents a tool for analysis of the
mechanical effects of the evolution of the shape of a system, how it can
be applied to observations and experiments, and how it may be adapted to
produce predictive theories of numerous phenomena. The book is divided
into three parts. The first relates the principle of virtual work to
what we observe with our eyes, the second demonstrates its flexibility
on the basis of many examples, and the third applies the principle to
predict the motion of solids with large deformations. Examples of both
usual and unusual shape changes are presented, and equations of motion,
some of which are entirely new, are derived for smooth and non-smooth
motions associated with, for instance, systems of disks, systems of
balls, classical and non-classical small deformation theories, systems
involving volume and surface damage, systems with interactions at a
distance (e.g., solids reinforced by fibers), systems involving
porosity, collisions, and fracturing of solids.