--- 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!!!! > > _________________________________________________________ > Do You Yahoo!? > Get your free @yahoo.com address at > http://mail.yahoo.com > > ################################################################ > TechNet E-Mail Forum provided as a free service by > IPC using LISTSERV 1.8c > ################################################################ > To subscribe/unsubscribe, send a message to > [log in to unmask] with following text > in the body: > To subscribe: SUBSCRIBE TechNet <your full name> > To unsubscribe: SIGNOFF TechNet > ################################################################ > Please visit IPC's web site (http://www.ipc.org) > "On-Line Services" section for > additional information. > For technical support contact Hugo Scaramuzza at > [log in to unmask] or 847-509-9700 > ext.312 > ################################################################ > > ################################################################ > TechNet E-Mail Forum provided as a free service by > IPC using LISTSERV 1.8c > ################################################################ > To subscribe/unsubscribe, send a message to > [log in to unmask] with following text in the body: > To subscribe: SUBSCRIBE TechNet <your full name> > To unsubscribe: SIGNOFF TechNet > ################################################################ > Please visit IPC's web site (http://www.ipc.org) > "On-Line Services" section for additional > information. > For technical support contact Hugo Scaramuzza at > [log in to unmask] or 847-509-9700 ext.312 > ################################################################ > > _________________________________________________________ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################ ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################