Thepa ea mochini oa thepa ea polymer

August 22, 2024

Thepa ea Mechani

1. Matla a Tense

Mocheso o boletsoeng oa teko, mongobo le lebelo la kopo, hammoho le taolo ea axial axal ea ho sebelisa mojaro oa tensitse, ho fihlela tšenyo e kholo. Moratuoa oa mofuta oa khatello ea maikutlo a mangata, e bitsoang ka matla a Tennker (matla a futhumetseng). Matla a matla (σt) a baloa ho latela foromo e latelang:

Moo p ke mojaro o phahameng haholo, n; b ke bophara ba mofuta oo, m; D ke botenya ba mofuta oa m. Moroalo o phahameng o timetsang oa mofuta oo, n, ke mojaro o molelele haholo oa tšenyo.

1) Ho tloha nakong ea ho phomola ha mohlala oa ho lieha, karolo e sebetsang ea litlolo le matšoao a qala ka ho phomola (hotle). Holo Holong Dreation (Iεt) e baloa ho latela foromo e latelang

Moo l0 bolelele ba mohlala o atlehileng oa mohlala, limilimithara; Ke bolelele bo sebetsang ba mohopolo bo robehileng, mm.

2) Tekanyetso ea poisson e le moeling oa thepa e lekanang ea karolelano ea karohano e bakoang ke khatello ea nako e tšoanang e bitsoa tekanyo ea Poisson. Karolelano ea poisson (ν) e ka baloa ke foromo e latelang:

Moo ho ho hone ho hoholo

3) Phelulus ea ho lla ha moeli o lekanang, karolelano ea khatello ea maikutlo ho Elasticity), e tsejoa hape e le Modulus oa Bacha), e tsejoang hape e le Mosuluus oa You ea Bacha. Teko ea Tenseile ea Elasticity (et) e baloa ho latela foromo e latelang:

Moo ΣT e leng khatello ea maikutlo le ho ba ho tsitsipana ke tensile.

Tekanyetso ea liteko: Gb / t 1040-4022 Mokhoa oa tlhahlobo bakeng sa thepa ea polasetiki ea polasetiki.

2. Matla a hatellang

Moroalo o boima o sebelisoa ho lipheletso ka bobeli tsa mofuta ho fihlela li-ruptumente tse boletsoeng (thepa ea britle) kapa lihlahisoa tse se nang brittle).

Kapa lihlahisoa (thepa ea brittle) ha khatello e thata ea brittle e ngata haholo, e tsejoang e le matla a ho qobella (matla a compression). Matla a compression (σc) a baloa ho latela foromo e latelang:

Moo p e robehileng kapa e nyelisang, n; F ke sebaka sa karolo ea pele ea sebopeho sa mofuta oa mofuta oa m2.

Compression Modulus (ec) e baloa ke equation e latelang:

Moo σc e kholisang khatello ea maikutlo, PA; εc ke likhohlano tsa likhohlano.

Tekanyetso ea liteko: GB / t 1041-2008 la Tlhahlobo ea Tlhahlobo ea Ts'ebetso ea Tlhaho ea Ts'ireletso ea Tlhahlobo.

3. Matla a ho fetella

Khatello ea khatello e ngata e hlahisoang ha thepa e beiloe ke mojaro o otlollang o timetsang kapa o fihla ho degree ea moea o sa buuoang. Matla a mangata (σf) a baloa ho latela mokhoa o latelang:

Mojaro oa ho khumama o hokae? Ke bolelele ba mofuta oa mofuta, m; b ke bophara ba mofuta oo, m; D ke botenya ba mofuta oa m.

Ho feto-fetoha lehlokoa le maemo a makatsang: polasetiki moeling oa khatello ea maikutlo le palo ea eona ea khatello ea maikutlo (e feto-fetohang ka ho fetelletseng ea Elasticus.

Ho feto-fetoha ha Modululus (ef) ho baloa ke foromo e latelang:

Acrof ke khatello ea maikutlo, PA; εf ke mathata a ho koala.

Tekanyetso ea liteko: GB / t 9341-2008 Mokhoa oa ho hlahloba ts'ebetso ea polasetiki ea polasetiki.

4. Matla a amang

Matla a amang (matla a tšusumetso) a emela bokhoni bo phahameng ba thepa ho mamella mojaro oa tšusumetso. Ka ho lona, tlasa mojaro oa tšusumetso, timetso ea lintho tse bonahalang ea mosebetsi e jeoang le karolelano ea sebaka sa karola ea sefapano. Ho na le mekhoa e 'meli ea liteko ea matla a ho ama thepa.

1) Mokhoa o tšehetsang mokhoa oa ho senya bakeng sa phello e sa tsoakoang (αn) le matla a tšusumetso (αk) e baloa ho latela foromo e latelang:

Unnotched impact strength (αn) and notched im

Mme

Moo mosebetsi o felisitsoe ke tlhahlobo e sa reng letho, J; AK ke mosebetsi o jeoang ke mofuta o boletsoeng, J; b ke bophara ba tlhahlobo, m; D Na bophara ba mofuta o sa buloang, m; DK ke mofuta o boletsoeng o kentsoe botebong bo setseng, m. 2) Wimplever ea BEAM COSTOT PUSELETSO EA HO SEBELISA MOLEMO OA HO SEBELISA MOTSI OA MOTSOALLE

2) Mokhoa oa Bybell Admidence Mokhoa ona o sebelisa mofuta o sa reng letho, 'me matla a eona a tšusumetso (αk) e baloa ho latela foromo e latelang:

Moo AK e jeoang teng ha ho jeoa ke nako eo ke mohlala, J; ΔE ke mosebetsi o jeoang ka ho lahla pheletso ea mahala ea mofuta o bolokiloeng, J; b ke bophara ba mohlala ho Notch, M.

Tekanyetso ea liteko: GB / t 1043-2018 Rigid polasetiki e sentse mokhoa o tšehelitsoeng oa libalaka

GB / T ea 1843-2008 mokhoa oa ho hlahloba oa li-cubell bakeng sa borashe ba polasetiki; GB / T 14485-1993 Mokhoa oa tlhahlobo ea tlhahlobo ea boenjiniere

Mokhoa oa tlhahlobo ea 14485-1993 bakeng sa ho hanela lithollo tsa polasetiki le likarolo tsa polasetiki; GB / T 11548-1989 Mokhoa oa ho hanela ho hanela poleiti e thata ea polasetiki ea polasetiki

Mokhoa oa ho oa ha hammer; GB / t 13525-1992 Mokhoa oa ho hanyetsa litho tsa polasetiki ea trustetics.

5. thata

Ho ba thata ho bolela ho hanyetsa ha thepa ea polymer ho ea ho inducter le ho cheka. Ho latela mokhoa oa tlhahlobo, ho na le litekanyetso tse 'ne tse sebelisoang haholo.

1) brinell Harness HB (Brinell Harness)

Beha boholo bo itseng ba bolo ea tšepe, e le ketso ea mojaro o boletsoeng, tobetsa ka nako e itseng, ho boloka botebo ba ho bala sebaka sa matla, le

E le tekanyo ea mathata. Lipolelo tsa bona li

Mme

Mojaro o kentsoeng teng, n; D ke bophara ba bolo ea tšepe, m; d ke bophara ba induction, m; H ke botebo ba induction, m.

Tekanyetso ea Teko: HG2-168-65 Brinell Hardness Tech Mokhoa oa Plastics

2) Ho thatafala ha ho thata

Tlas'a ketso ea standard e tloaelehileng ka mojaro o boletsoeng, bothata ba nale e neng e hatetse pele ka mokhoa o ikhethileng ka mor'a nako e sa tloaelehang ea nako. Ho thatafala ha ho arotsoe lebopong la ho ea le lebopong la D. ea pele e sebetsa ho lisebelisoa tsa softer; ea morao-rao e sebetsa ho thepa e thata.

Tekanyetso ea Teko: GB / T 2411-2008 Shore Hardness Tech Mokhoa oa Plastics

3) RockSell Harness

Ho thatafala ha Rockwell ho na le mekhoa e 'meli ea polelo. ① Ntoa e le thata ea tšepe ea jewer Bohlokoa, bo hlahisitsoeng ho Hr. Mokhoa ona oa ho bua o sebetsa ka thepa e thata, e arotsoeng r, m, tekanyo.

Tekanyetso ea Teko: GB / T 9342-CENCY Mokhoa oa Tlhahlobo ea Tlhatlhobo ea Liketekete bakeng sa Plastics

② Hardwell h bophara ba bolo ea tšepe, tlasa ketso ea mojaro o boletsoeng, o hatelloa ka botebo ba boleng ba boleng bo thata, bo hlahisitsoeng ho H.

Tekanyetso ea Teko: GB / t 3398-2008 Mokhoa oa Tlhahlobo ea Tlhahlobo ea Tlhahlobo ea Teko ea Lisa Like tsa polasetiki tsa tšepe

4) Barcol Hardness

Sebaka se khethehileng se hatelloa ka nako e tloaelehileng ea selemo sa selemo.

Khatello ea selemo ka mokhoa o khethehileng oa khatello ea selemo ea selemo se qalang hore e khetholle ho thatafatsa ho khetholla ho ba thata. Mokhoa ona o loketse ho tseba hore na fiber ea fibare le lihlahisoa tsa bona le tsona li ka sebelisoa ho thata ea lipontšo tse ling tse thata.

Tekanyetso ea Teko: GB / T 3854-2017 Fiber-Relinmadser oa Bachmann (Bakel

Mokhoa oa Tlhahlobo.

6. ho kopa

Tlas'a maemo a mocheso le mongobo, deformation ea thepa e tla eketseha ka nako tlas'a ketso e tsoelang pele ea ka ntle.

Tlas'a maemo a sa khaotseng le a mongobo, thepa e ka tlas'a khato e tsoelang pele ea matla a kantle, deformation e eketseha ka nako; Phetoho butle-butle e ile ea fola butle ka mor'a ho tlosa matla a kantle, ketsahalo ena e bitsoa Creep (secrep).

Ketsahalo ena ena e bitsoa creep. Ka lebaka la matla a fapaneng a kantle, hangata a ka aroloa hore e se ke ea aroloa ke ternile, compression creep, shear creep, e shelle le ho koala.

Tekanyetso ea Teko: GB / T 11546-2022 Boikemisetso ba ts'ebetso ea Creep ea Plastics

7. Mokhathala

Mokhathala (Mokhathala) ke ntho e shebiloeng ka khatello ea maikutlo kapa khatello ea maikutlo e bakoang ke liphetoho tsa sebopeho sa lehae le bokhachane. Mokhathala ke mokhoa oa liphetoho tsa lehae tsa lehae le nts'etsopele ea bofokoli ba kahare bo bakiloeng ha thepa e sebelisoa ho fapana le likhatello tsa cyclic kapa li-antis.

8. Khohlano le ho roala

Lintho tse peli tse amanang le lintho tse peli, ho na le ho tsoaloa lipakeng tsa bonngoe kapa ho ba le matla a ho fafatsa, ka kakaretso e bitsoa likhohlano. Ho lekana ha likhohlano le ho roala ho khetholla thepa ea tšepe ea thepa.

1) Cratice Card (carile tsa khohlano)

Boholo ba likhohlano li baloa ho latela foromo e latelang

Mme

moo μk ke ntho e lekaneng ea khohlano ea Kinettic, le P ke khatello e ntle, N.

2) Abrasuon

Palo ea tahlehelo ea lintho tsa nama kamora ho terompeta nako e itseng kapa nako ea nako e boletsoeng tlasa maemo a liteko a boletsoeng a ho bitsoa abrasion.

Palo ea tahlehelo ea lintho tse bonahalang kamora ho teneha ka nako e itseng kapa thupelo e bitsoa afarion. Ho molemo ho hanyetsa boitsebiso ba thepa, ho fokotsa palo ea abrasion.

Teko ea liteko: GB / T 3360-2016 Friching Friction Wear Mehato ea Tlhahlobo ea Plasttics GB / T 5478

E fetileng

E 'ngoe

Iteanye le rona

Author:

Ms. Tina

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