Analysis of Boeing Platforms Item 1 Description The sandwich panel is a trapezoid of approximately 51 inches by 45 inches supported on two end plates attached to an existing structure by angle clips. The panel must support two 250 lb. concentrated loads at its extremities. The sandwich panel is to use 1.88 inch thick, 3/8-cell commercial grade aluminum honeycomb faced with .040 inch 5052-H32 aluminum sheet. FEA Model The panel was modeled with 736 quadrilateral elements. ALGOR Type 16 sandwich elements having five degrees of freedom at each node were used in analysis. The 250 lb. live load was modeled as nine 28 lb. nodal force concentrated near the extreme corners of the panel per the customer's specification. The panel was constrained at the angle clip support against deflection. The .375 inch end plates of the support frame were neglected in this analysis. Results The FE analysis gave a maxium deflection of .086 inch. The maximum von Mises stress in the panel faces was 2678 psi, giving a safety factor versus yield of 10.4. Maximum shear stress was 28 psi near the supports. This is not critical and should be alleviated by the .375 inch end plates. Alternative Loading Loads were placed at opposite edges of the panel between the support areas. Deflections and stresses were lower than for the first case. Item 2 Description The sandwich panel is a rectangle of 105 inches by 24 inches supported on four pins on the long edges at approximately the 1/4 points. The panel must support two 250 lb. concentrated loads at its extremities. The sandwich panel is to use 1.88 inch thick, 3/8-cell commercial grade aluminum honeycomb faced with .040 inch 5052-H32 aluminum sheet. It is desired to determine the maximum deflection and stress level in the panel. FEA Model The panel was modeled with 2803 inch by 3 inch quadrilateral elements. ALGOR Type 16 sandwich elements having five degrees of freedom at each node were used in the analysis. The 250 lb. live loads were modulated as nine 28 lb. nodal force concentrated near the extreme ends of the panel per the customer's specification. The panel was constrained at the pin supports against deflection. The angle frame attached to the top of the panel was neglected in this analysis. Results The FE analysis gave a maximum deflection of .094 inch. The maximum von Mises stress in the panel face was 2682 psi, giving a safety factor versus yield of 10.4. Maximum shear stress was 43 psi near the supports. These values are acceptable and should be improved by including the angle frame. return to top

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