Stress and strain transformations in composite materials

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samson07
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Does anyone know how to even start this problem.. :(
I seriously have no idea...spent like few hours to find this out on the library and no luck...
Please help a poor guy out...I aint smart enough for this...
 
Attachments
  • Table of transformed reduced stiffness values Q-bar in GPa for a graphite/epoxy laminate at 0, 45 and -45 degrees, with the problem statement above giving t_ply = 0.135 mm and loads M1 = 100 N·m/m.
    2.jpg
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Discussion

Hi Samson07,

I think this needs to be tackled from a strain perspective as well as a stress perspective as the material is a laminate. For composites, you need to perform both on-axis properties and off-axis properties in order to fully analyse the laminate.

Try looking under 'Stress and Strain Transformations in Composites'. This should tell you a bit more about it and it will also explain the stiffness matrix that you have presented in your attachment.

Good luck...

Kind Regards,

Jus