article · Materials Research Express
A theoretical model introduces a new porosity distribution to evaluate the bending behaviour of functionally graded material sandwich plates. In this configuration, the structure consists of functionally graded outer face layers coupled with a homogeneous ceramic core. Material properties across the face layers vary continuously through the thickness based on either power-law or sigmoid functions governing the volume fractions of the constituent materials. A new higher-order deformation theory is developed to establish the governing field equations for plates under simply-supported edge boundaries. Numerical investigations show the distinct effects that porosity, sandwich plate geometry, and material grading profiles exert on structural deflections and internal stresses. The precision and validity of the proposed formulation are verified through comparison with results from previously published studies.
Understanding structural stresses and deformations in advanced layered materials helps engineers design stronger, more resilient components. Unintended internal voids or porosities frequently develop during the manufacturing of composite materials, and accurately calculating how these microstructural features alter mechanical behaviour under bending loads enables more reliable performance predictions before physical prototyping takes place.
The work represents early-stage research focused on mathematical formulation and numerical modeling. While structural analysts and composite material designers could potentially utilise the theory to simulate plate performance, the abstract does not indicate a specific commercial application pathway, target customer, or physical testing programme.
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A new porosities distribution is proposed for bending analysis of new model of functionally graded material (FGM) sandwich plates. Material properties of FGM layers are assumed to vary continuously across the plate thickness according to either power-law or sigmoid function in terms of the volume fractions of the constituents. The face layers are considered to be FG across each face thickness while the core is made of a ceramic homogeneous layer. New higher-order deformation theory is proposed to derive the field equations of the FG sandwich plates with simply-supported edge conditions. Numerical results are presented to show the effect of the material distribution, the sandwich plate geometry and the porosity on the deflections and stresses of FG sandwich plates. The accuracy of this theory is ascertained by comparing it with other published results.
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DOI: 10.1088/2053-1591/ab0971
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