Qhov 2 ntawm cov yeeb nkab thiab cov lus siv: kev tsim qauv, MRS, thiab R20 preference series, piav qhia yooj yim rau cov kws tshaj lij PE yeeb nkab.

11. Kev ntxhov siab tsim σs:
Qhov kev ntxhov siab tso cai raws li cov xwm txheej tau muab, suav raws li MRS faib los ntawm coefficient C, muab txo mus rau tus nqi me dua tom ntej hauv R20 series, uas yog σs = [MRS] / C.
12. Kev sib txawv tso cai / Kev sib txawv txwv:
Qhov sib txawv ntawm qhov txwv tso cai thiab tus nqi tau teev tseg. Qhov siab tshaj plaws tso cai tshem tawm tus nqi tau teev tseg yog qhov sib txawv siab tshaj, thiab qhov tsawg tshaj tso cai tshem tawm tus nqi tau teev tseg yog qhov sib txawv qis dua.
13. Kev tso cai:
Kev hloov pauv tso cai ntawm ib qho kev ntsuas tshwj xeeb, qhia raws li qhov sib txawv ntawm qhov siab tshaj thiab qhov tsawg tshaj plaws tso cai. Nws sib npaug rau qhov sib txawv ntawm qhov sib txawv siab thiab qis.
14. Qhov dav sab nraud ntawm txhua qhov chaw:
Qhov dav sab nraud ntsuas ntawm txhua qhov cross-section ntawm yeeb nkab, hauv mm.
15. Qhov dav nruab nrab:
Qhov dav uas cuam tshuam rau nruab nrab ntawm phab ntsa yeeb nkab. Qhov dav nruab nrab yog qhov nruab nrab sab nraud txoj kab uas hla tshem tawm qhov nruab nrab phab ntsa tuab, lossis qhov nruab nrab sab hauv ntxiv rau qhov nruab nrab phab ntsa tuab, hauv mm.
16. 20°C, 50-xyoo kev ntseeg siab qis kawg (σLCL):
Ib qho nqi ntxhov siab siv los ntsuas kev ua haujlwm ntawm cov khoom, hais txog qhov kev kwv yees zog ntev ntawm cov khoom raj ntawm 20°C hauv qab 50-xyoo dej siab, nrog 97.5% kev ntseeg siab, hauv MPa.
17. Lub zog hydraulic ruaj khov ntev (σLTHS):
Sawv cev rau qhov nruab nrab zog kwv yees ntawm ib qho kub T thaum lub sijhawm t (lub zog nruab nrab ntawm no txhais tau tias qhov qis tshaj ntawm 50% kev ntseeg siab), hauv MPa.
18. 20°C, 50-xyoo zog ntev (σLTHS):
Qhov nruab nrab lossis kwv yees lub zog nruab nrab ntawm lub raj ntawm 20°C hauv qab 50-xyoo dej siab, hauv MPa.
19. Kev tawg ntawm kev ntxhov siab ib puag ncig:
Kev tawg nrawm vim cov yam ntxwv ib puag ncig. Ib qho khoom muaj peev xwm tiv thaiv qhov no feem ntau ntsuas raws li ESCR.
20. Qib txuas hla:
Ib qho ntsuas ntawm qhov ntau ntawm kev txuas txuas tau tshwm sim. Thaum polymer chains sib txuas, nws qhia raws li tus naj npawb nruab nrab ntawm cov khoom txuas txuas ib molecule polymer, hu ua qhov ntom txuas lossis qhov ntsuas txuas. Feem ntau qhia raws li cov ntsiab lus gel.