# Composite Panel Calculations.xlsx

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### Description

Purpose of calculation:
Simply Supported Plate - width (b) greater than 1/3 of length (a). Because plate theory is more involved than beam theory, some 'charts' have been provided to give multipliers/coefficients (k1, k2, k3a & k3b) for use with plates simply supported on all four sides.

Calculation Reference
HexWeb SANDWICH DESIGN MANUAL

Calculation Validation

Reproduced result published in manual.

Calculation Procedure

1) Determine Panel Properties

• Thickness of face material and core
• Young's modulus of face and core
• Shear modulus of core
• Core allowable shear stress
• Core Cell size
• Poisson's ratio of face
• Limiting stress in face
• Buckling Safety Factor
• Poisson's ratio term
• Core shear modulus ratio
• Distance between face centres
• Critical intracell buckling stress
• Critical face wrinkling stress

• Dimensions of panel
• Panel deflection term
• Lookup values from graphs (encoded on 'K1' worksheet)
• Deflection of panel
• Lookup values from graphs (encoded on 'K2' worksheet)
• Max face stress
• Lookup values from graphs (encoded on 'k3a' worksheet)
• Core shear stress - a direction (W direction)
• Lookup values from graphs (encoded on 'k3b' worksheet)
• Core shear stress - b direction (L direction)

SELECT FACING MATERIAL FROM LOOKUP TABLE
• Epoxy UD CARBON tape (0°) 60% volume fraction
• Epoxy UD GLASS tape (0°) 55% volume fraction
• Epoxy WOVEN CARBON (G793-5HS) 55% volume fraction
• Epoxy WOVEN ARAMID (285K-4HS) 60% volume fraction
• Epoxy WOVEN GLASS (7781-8HS) 50% volume fraction
• Phenolic WOVEN GLASS (7781-8HS) 55% volume fraction
• ALUMINIUM Alloy 2024 T3
• ALUMINIUM Alloy 5251 H24
• ALUMINIUM Alloy 6061 T6
• STEEL carbon 1006
• STEEL carbon 1017
• Exterior PLYWOOD Fir
• Tempered HARDWOOD Teak

SELECT CORE MATERIAL FROM LOOKUP TABLE
• 3003 Aluminium  29kg/m³
• 3003 Aluminium  37kg/m³
• 3003 Aluminium  42kg/m³
• 3003 Aluminium  54kg/m³
• 3003 Aluminium  59kg/m³
• 3003 Aluminium  83kg/m³
• 5052 Aluminium  37kg/m³
• 5052 Aluminium  50kg/m³
• 5052 Aluminium  54kg/m³
• 5052 Aluminium  72kg/m³
• 5052 Aluminium  83kg/m³
• 5052 Aluminium  127kg/m³
• 5052 Aluminium  130kg/m³
• 5056 Aluminium  37kg/m³
• 5056 Aluminium  50kg/m³
• 5056 Aluminium  50kg/m³
• 5056 Aluminium  72kg/m³
• HRH10 Nomex (Aramid) 29kg/m³
• HRH10 Nomex (Aramid) 32kg/m³
• HRH10 Nomex (Aramid) 32kg/m³
• HRH10 Nomex (Aramid) 48kg/m³
• HRH10 Nomex (Aramid) 48kg/m³
• HRH10 Nomex (Aramid) 64kg/m³
• HRH10 Nomex (Aramid) 64kg/m³
• HRH10 Nomex (Aramid) 80kg/m³
• HRH10 Nomex (Aramid) 96kg/m³
• HRH10 Nomex (Aramid) 123kg/m³
• HRH10 Nomex (Aramid) 144kg/m³
• HRH10 Nomex (Aramid) 29kg/m³
• HRH10 Nomex (Aramid) 48kg/m³

Calculation Reference
Composites Design

Composite Materials

Composite structures

### Calculation Preview

19 Feb 2010
File Size: 189.45 Kb