Kev ntxhov siab tiag tiag yog qhov kev ntxhov siab txiav txim siab los ntawm kev thauj khoom sai sai ua rau thaj chaw hla ntu ntu tam sim . True Strain (εt): Muaj tseeb hom yog logarithmic thiab engineering strain yog linear. Txawm li cas los xij nws zoo li yuav luag zoo ib yam rau qhov me me deformation vim qhov muaj nqis me me hauv Taylor nthuav dav.
Dab tsi yog qhov txawv ntawm engineering thiab kev ntxhov siab tiag tiag?
Kev nkhaus raws li qhov qub ntu ntu thiab ntsuas qhov ntev yog hu ua engineering stress-strain nkhaus, thaum nkhaus raws li thaj tsam hla tam sim nothiab ntev yog hu ua qhov tseeb stress-strain nkhaus. Engineering kev ntxhov siab yog cov ntaub ntawv siv tau muab faib los ntawm thawj ntu ntu ntawm cov khoom siv.
Koj suav qhov kev ntxhov siab thiab kev nyuaj siab li cas?
True stress=(engineering stress)exp(true strain)=(engineering stress)(1 + engineering strain) where exp(true strain) yog 2.71 tsa rau lub hwj chim ntawm (qhov tseeb strain).
Qhov txawv ntawm kev ntxhov siab thiab kev ntxhov siab yog dab tsi?
Nyob zoo, kev ntxhov siab engineering yog cov ntaub ntawv siv tau muab faib los ntawm thawj ntu ntu ntawm cov khoom siv. Kuj tseem hu ua nominal stress. Kev ntxhov siab tiag tiag yog qhov siv cov khoom sib faib los ntawm thaj chaw hla ntu (qhov hloov pauv raws li lub sijhawm) ntawm cov qauv ntawm qhov load.
Puas muaj tseeb strain ntau dua engineering strain?
Raws li tus txheeb ze elongation nce, qhov tseeb strain yuavdhau los ua qhov tsawg dua qhov kev sib tw engineering thaum qhov kev ntxhov siab tiag tiag ua ntau dua li engineering kev ntxhov siab. Thaum l=4.0 lo ces =3.0 tab sis qhov tseeb strain=ln 4.0=1.39. Yog li ntawd, qhov tseeb strain tsawg dua 1/2 ntawm engineering strain.
