Fad¨² mar an fad ag pointe briseadh a l¨¦ir¨ªtear mar ch¨¦atad¨¢n d¨¢ fhad bunaidh (i.e. Fad ag sosa). M¨¢ shroicheann rubar faoi dh¨® oiread a fhad sula bhriseann s¨¦ 100% a ch¨¦atad¨¢n fad¨².
°Õ¨¢²ú³ó²¹³¦³ó³Ù:
A ch¨¢ili¨² elastomer go meicni¨²il lena ¨²s¨¢id i bhfeidhm, t¨¢ s¨¦ riachtanach an f¨®rsa a theasta¨ªonn chun sampla a fh¨¢il chuig a phointe r¨¦abadh a thomhas. T¨¢ s¨¦ t¨¢bhachtach a thuiscint ar fhad¨² do elastomers chun an rogha is fearr le h¨²s¨¢id ag ¨¢r gcustaim¨¦ir¨ª. Beidh d¨ªfhoirmi¨² rubair mar thoradh ar shampla rubair. De r¨¦ir mar a th¨¦ann an sampla n¨ªos faide, laghd¨®far codanna a chuirfidh sos sa deireadh. Tomhas
:
Cinneann an modh t¨¢st¨¢la an inathraitheacht i vulcanizates rubair agus an tionchar paraim¨¦adair a th¨¦ann i bhfeidhm ar na air¨ªonna strus-strain mar shampla. teocht, taise coibhneasta, agus r¨¦amhchoinn¨ªoll¨² rubar.
A feiste tarraingthe, ar a dtugtar dynometer, t¨¢ extensometer aige a leanann go opt¨²il n¨® go meicni¨²il 2 mharc ar an sampla. Is f¨¦idir leis an dynometer, ag am ar bith, m¨¦id an sampla t¨¢st¨¢la rubair a thomhas le linn an ch¨¦im tarraingthe s¨ªneadh, agus nuair a thagann an pointe briseadh. T¨¢ sampla¨ª
cruth Cn¨¢mha s¨ªnte sa chuid caol ina nd¨¦antar an d¨¢ mharc. Is minic a rothl¨² sampla¨ª O-f¨¢ire le linn s¨ªneadh ionas nach nd¨¦antar aon chrios sonrach i bhfeidhm. T¨¢ luas rothlaithe san ¨¢ireamh sna tortha¨ª.
¸é¨ª´Ç³¾³ó:
Nuair a ¨²s¨¢idtear marcanna tomhsaire n¨® extensometers chun rann¨¢n t¨¢st¨¢la ar leith a shaini¨², ach an fhad seo a ¨²s¨¢idtear sa r¨ªomh, ar shl¨ª eile ¨²s¨¢idtear an fad idir na greim mar fhad tosaigh an tomhsaire.
Tortha¨ª / Tuairisci¨²:
T¨¢ an fhad¨² in i¨²l mar ch¨¦atad¨¢n, agus tuairisc¨ªtear ¨¦ do dh¨¢ fhigi¨²r suntasach.
faoin gc¨¦ad ar fhada = (fhaid ag r¨¦abadh) x 100 / (fad tosaigh tomhsaire)
