Free Vibration of Functionally Graded Sandwich Shallow Shells on Winkler and Pasternak Foundations with General Boundary Restraints

<table class="fixed-width table-group" id="tab1"><tr><td><table class="table"><colgroup><col style="width:8.09em"/><col style="width:4.47em"/><col style="width:2.45em"/><col style="width:5.35em"/></colgroup><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td class="align_left" rowspan="2">Material</td><td class="align_center" colspan="3">Properties</td></tr><tr class="thead"><td class="align_center"><i>E </i>(GPa)</td><td class="align_center"><i><i>μ</i></i></td><td class="align_center"><i><i>ρ</i>  </i>(kg/m<sup>3</sup>)</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left">Metal (Al)</td><td class="align_center">70</td><td class="align_center">0.3</td><td class="align_center">2702</td></tr><tr><td class="align_left">Ceramic (Al<sub>2</sub>O<sub>3</sub>)</td><td class="align_center">380</td><td class="align_center">0.3</td><td class="align_center">3800</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Main materials properties of the used FG layer.</div>

Mathematical Problems in Engineering

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Table 1

Table 1: Free Vibration of Functionally Graded Sandwich Shallow Shells on Winkler and Pasternak Foundations with General Boundary Restraints 