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Mechanical Engineering

Ammar Burhani

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Everything posted by Ammar Burhani

  1. Hi, I have question on how to determine the material properties of CFRP such as Young's modulus (E11, E22, E33), shear modulus (G12, G13, G23) and Poisson's ratios (V21, V13, V32). Since composite is consider as neither isometric or orthotropic material, it is location and direction dependent material. Im trying to model this structure made from this material using finite element modelling but lack of certain properties. I know that for E11, E22 and V12 (for the case of woven fabric) I can obtain from the tensile test ASTM D3039 and G12 from ASTM D3518. But how to can I find the other value. Is there any calculation I can refer to? Any suggestion and comments are welcome. Thank you very much.
  2. Could you let me know how to make the free body diagram and the boundary conditions for Q1a? Thank you
  3. Anyone interested in solving this interesting engineering problem may solve it and we can discuss the result together. I need some help because some of the part I don't understand the requirement of the question. NVH.pdf
  4. Thank you very much for the help! It really means a lots.
  5. What is the meaning of this picture taken from the ASTM D3039 tensile test?
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