This book describes significant tractable models used in solid
mechanics - classical models used in modern mechanics as well as new
ones. The models are selected to illustrate the main ideas which allow
scientists to describe complicated effects in a simple manner and to
clarify basic notations of solid mechanics. A model is considered to be
tractable if it is based on clear physical assumptions which allow the
selection of significant effects and relatively simple mathematical
formulations. The first part of the book briefly reviews classical
tractable models for a simple description of complex effects developed
from the 18th to the 20th century and widely used in modern mechanics.
The second part describes systematically the new tractable models used
today for the treatment of increasingly complex mechanical objects -
from systems with two degrees of freedom to three-dimensional continuous
objects.