Comments

• Victor

  November 2016

  Here's a simple cantilever beam sandwich panel.

  
  

  Skin thickness = 0.2 mm

  Overall thickness = 10 mm

  
  

  Bending moment per unit length at the support = force per unit length * beam length

  = 20 N/m * 1 m = 20 N.m/m

  
  

  Mecway solution: Moment per Length U = 20.0 N

  
  

  Tensile stress in the skin:

  Because the skin layers are very thin relative to the laminate's overall thickness, we assume each skin layer is in pure tension or compression.

  Because the skin layers have a much higher Young's modulus than the core, we assume no load is carried by the core.

  
  

  tensile stress = moment per unit length / laminate thickness / skin thickness

  = 20 N.m/m / 0.01 m  / 0.0002 m = 1.0e7 Pa

  
  

  Mecway solution: Principal Stress 1, Upper surface = 1.04e7 Pa

  Mecway solution: Principal Stress 2, Bottom surface = -1.04e7 Pa

  
  

  Laminate Stress Cantilever.liml 31.6K