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Discussion in 'Biomechanics, Sports and Foot orthoses' started by cperrin, Mar 31, 2008.

  1. cperrin

    cperrin Active Member

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    Hey eveyone.

    A quick question, could someone briefly describe hysteresis for me in a podiatric context? as my brain is stuggling to come to terms with it and its use in biomech. Thanks in advance
  2. Admin2

    Admin2 Administrator Staff Member


    Electric displacement field D of a ferroelectric material as the electric field E is first decreased, then increased. The curves form a hysteresis loop.

    Hysteresis is the dependence of the state of a system on its history. For example, a magnet may have more than one possible magnetic moment in a given magnetic field, depending on how the field changed in the past. Plots of a single component of the moment often form a loop or hysteresis curve, where there are different values of one variable depending on the direction of change of another variable. This history dependence is the basis of memory in a hard disk drive and the remanence that retains a record of the Earth's magnetic field magnitude in the past. Hysteresis occurs in ferromagnetic and ferroelectric materials, as well as in the deformation of rubber bands and shape-memory alloys and many other natural phenomena. In natural systems it is often associated with irreversible thermodynamic change such as phase transitions and with internal friction; and dissipation is a common side effect.

    Hysteresis can be found in physics, chemistry, engineering, biology, and economics. It is incorporated in many artificial systems: for example, in thermostats and Schmitt triggers, it prevents unwanted frequent switching.

    Hysteresis can be a dynamic lag between an input and an output that disappears if the input is varied more slowly; this is known as rate-dependent hysteresis. However, phenomena such as the magnetic hysteresis loops are mainly rate-independent, which makes a durable memory possible.

    Systems with hysteresis are nonlinear, and can be mathematically challenging to model. Some models such as the Preisach model (originally applied to ferromagnetism) and the Bouc-Wen model attempt to capture general features of hysteresis; and there are also phenomenological models for particular phenomena such as the Jiles-Atherton model for ferromagnetism.

  3. cperrin

    cperrin Active Member

    surely thats cheating : ) muchos thanks
  4. admin

    admin Administrator Staff Member

    BTW - if you hadn't noticed, thats a live Wikipedia page we can now insert into messages -- the links in it are live. To go to the Wikipedia site - just right click on a link and click 'open in new window'.
  5. Craig Payne

    Craig Payne Moderator

    Here is some eg's of how hysteresis is related to plantar pressure measurement.
  6. I discussed hysteresis along with other viscoelastic properties in the thread on the Mechanical Properties of Tissues.

    Also try typing "hysteresis" into the "search" function at the top of the home page.

    A name at the end of your posting, cperrin, will get you even more answers.
  7. cperrin

    cperrin Active Member

    Many thanks and forgive me


    C Perrin : )
  8. cperrin

    cperrin Active Member

    Thanks for all your help on this topic, the links have helped a lot!

    Chris Perrin

    Podiatry BSc (Hons) Studnet
    Univeristy of Plymouth

  9. Chris:

    No problem. Hysteresis is a fundamental property of all viscoelastic materials. Since all the tissues of the human body are viscoelastic in nature, then, of course, hysteresis is important when considering the biomechanics of the human body. Stress relaxation and creep response are other very important time-dependent mechanical phenomena that occur in the viscoelastic tissues of the human body. You should do a search on these terms in Podiatry Arena and Google to learn more.
  10. What's a studnet? Is it an online sperm bank?:D
  11. cperrin

    cperrin Active Member

    woops,thats obviously why i go to Plymouth, present company accepted :D

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