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Poisson ratio fro human hair needed

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  • Poisson ratio fro human hair needed

    Greetings!

    About a month I'm looking for mechanical properties of human hair.
    I have sent message to biomechnics news line and got
    responce from Dr.ir. Paul A.J. Ackermans, where he gratefully helped me
    and sent me a name of the book:
    Chemical and Physical Behavior of Human Hair.
    But the values of elastic and shear modulus mentioned in the book
    are not realistic:
    E=3.89*10^10 dyn/sm^2
    G=0.89*10^10 dyn/sm^2
    ( check in Appendix)
    If You calculate Poisson ratio from the above mentioned value,
    You will obtain mu=E/(2*G)-1=1.18, when its value should be less
    than one ( I think It should be closed to those of plastic wires -
    about 0.2-0.4 ).

    So please, if you have any information about strength properties of
    human hair: Elastic and Shear modulus or/and POisson ratio,
    send me e-mail.

    Dima Elman.
    Deprt. of Biomedical Engineering. Technion. Israel.
    e-mail: elman@technunix.technion.ac.il
    or
    elman@biomed.technion.ac.il
    or
    uc@actcom.co.il, subject: for Dima

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