9H e bolela ho thatafala ha 9D e bolela ho kobeha ha lera.
Empa ha ho na 9D ea sebele, ho sa tsotellehe hore na ke lifilimi tse kae tsa D tempered tse arotsoeng feela ka li-curvature tse tharo: sefofane, 2.5D, le 3D.
9H e bua ka boima, boo ha e le hantle bo bolelang ho thatafala ha pentšele, eseng boima ba Mohs.Esita le sengoathoana sa khalase se ka feta boima bona, boo hape e leng gimmick ea papatso.
Hardness e arotsoe ka:
1. Ho thatafala ha 'mele.Haholo-holo e sebelisoa ho bapisa tekanyo ea bonolo le boima ba liminerale tse fapaneng.Mokhoa ke ho khetha molamu o nang le ntlha e 'ngoe e thata' me e 'ngoe e le bonolo ho e' ngoe, 'me u ngole thepa e lekiloeng haufi le molamu,' me u fumane hore na ke bonolo hakae le ho thatafala ha thepa e lekiloeng ho ea ka boemo ba mongoapo.Ha re bua ka boleng, mengoallo e entsoeng ke lintho tse thata e telele, 'me mengoapo e entsoeng ke lintho tse bonolo e mekhutšoanyane.
2. Tobetsa-ka thata.Haholo-holo e sebelisoang bakeng sa lisebelisoa tsa tšepe, mokhoa ona ke ho hatella inndenter e boletsoeng ka har'a thepa e lekiloeng ka mojaro o itseng, le ho bapisa ho thatafala ha thepa e lekiloeng le boholo ba deformation ea polasetiki ea sebakeng seo holim'a thepa.
Ka lebaka la phapang ea bolelele ba nako, boima le nako ea mojaro, ho na le mefuta e mengata ea ho thatafala ha indentation, haholo-holo Brinell hardness, Rockwell hardness, Vickers hardness le microhardness.
3. Rebound hardness.Haholo-holo e sebelisetsoang thepa ea tšepe, mokhoa ona ke ho etsa hamore e khethehileng e nyenyane e oela ka bolokolohi ho tloha bophahamong bo itseng ho ama sampuli ea thepa e lokelang ho lekoa, 'me e sebelise boholo ba matla a matla a bolokiloeng (ebe a lokolloa) ke sampuli nakong ea ts'ebetso ea ts'ebetso (ka ho khutla ha hamore e nyane).jump height determination) ho fumana boima ba thepa.
Mokhoa oa ho lekola boima ba Rockwell ke American SP E hlahisitsoeng ke Rockwell ka 1919, e hlola mefokolo e boletsoeng ka holimo ea tlhahlobo ea Brinell.Indenter e sebelisetsoang ho thatafala ha Rockwell ke khoune ea daemane e nang le angle ea taper ea 120 ° kapa bolo ea tšepe e bophara ba 1/16 inch (1 inch e lekana le 25.4 mm), 'me botebo ba indentation bo sebelisoa e le motheo oa ho lekanya boima. boleng.
Nako ea poso: Nov-18-2022