<s>
Energy	B-Algorithm
principles	I-Algorithm
in	I-Algorithm
structural	I-Algorithm
mechanics	I-Algorithm
express	O
the	O
relationships	O
between	O
stresses	O
,	O
strains	O
or	O
deformations	O
,	O
displacements	O
,	O
material	O
properties	O
,	O
and	O
external	O
effects	O
in	O
the	O
form	O
of	O
energy	O
or	O
work	O
done	O
by	O
internal	O
and	O
external	O
forces	O
.	O
</s>
