--- Roger Massey-G14195 <[log in to unmask]> wrote:
>      Lautaro,
>
>         There are a number of "methods" (over 30
> reported) for measuring
>      the hardness of materials, of which Shore is
> only one!
>
>         From what I understand, the Shore method
> makes use of a
>      scleromoter.  Basically, a small diamond
> pointed hammer weighing 2.5g
>      is allowed to free fall 250mm down a glass tube
> (graduated into 140
>      parts) The hardness is related to how far back
> the hammer rebounds
>      after its first rebound off the material
> sample. ASTM E448 has the
>      basic outline for the methodology, so I would
> take a look at that if
>      you are planning on using Shore tests
>
>         Other common methods include
>
>         Brinell - a 10mm steel ball is pushed into
> the sample with a set
>                 load and time, hardness is related
> to the size of the mark
>                 left in the sample. Not very good
> for very hard materials
>                 See ASTM E10
>         Vickers - Diamond tipped, square based
> pyramid pushed into the
>                 sample, again hardness relates to
> the size and shape of the
>                 mark left behind.  See ASTM E92
>         Rockwell - uses either a 1.58mm ball @ 100Kg
> (Scale B) or a diamond
>                 cone @ 150Kg (Scale C) this time the
> output dial indictaes
>                 depth of penetration which can be
> converted to an
>                 indication of hardness. See ASTM E18
>
>         Microhardness machines are used where the
> sample is either very
>      thin such as platings or very soft and is often
> based on the Vickers
>      or Knoop methods, See ASTM E384
>
>                 Good Luck,
>
>
>
>      Roger
>
> ______________________________ Reply Separator
> _________________________________
> Subject: [TN] Shore hardness
> Author:  "TechNet E-Mail Forum." <[log in to unmask]>
> at #email
> Date:    25/05/99 19:53
>
>
> Please, send my a message if you know how does the
> shore harness method
> works. I need inmformation urgent!
> I must do a work: harness of different materials,
> any idea?
>   Thanks!!!!
>
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