The strain energy of a thin laminated plate element is given by area integral over the element
 |
(18.14) |
Substituting from Equation (17.4) into Equation (18.14), the strain energy may be written as
 |
(18.15) |
In terms of area co-ordinates
 and  |
(18.16) |
where,
 and  |
(18.17) |
 |
(18.19) |
Substituting from Equation (18.16) into Equation (18.15), the expression of strain energy is
 |
(18.20) |
In the above equation
 |
(18.21) |
The strain energy in the form of element stiffness matrix can also be written as
 |
(18.22) |
The element stiffness matrix [K] is given by
 |
(18.23) |
where,
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