Vim, cov khoom siv hluav taws xob tsis muaj zog hauv shear. Li no cov ntaub ntawv ductile tsis ua hauj lwm tshwm sim vim lub hauv paus ntsiab lus shear stress. Hauv kev sim torsion qhov siab tshaj plaws shear stress yog nyob rau hauv cov kev taw qhia perpendicular mus rau longitudinal axis. Yog li ntawd, lub dav hlau tsis ua hauj lwm yog torsion yuav perpendicular mus rau longitudinal axis.
Puas shear tsis ua hauj lwm ductile los yog brittle?
Ntawm nruab nrab ntawm kev sib zog ua kom muaj kev ntxhov siab, brittle tus cwj pwm raug pom thiab shear fractures tsim thaum lub shear tsis ua hauj lwm nto (B thiab C). Nrog nce kev kaw, tus cwj pwm ua ductile thiab deformation ua ntau diffused (saum C).
Puas yog shear tsis ua haujlwm ductile?
Nyob rau hauv qhov tsis ua haujlwm, muaj tus yam ntxwv ductile shear nto kaum ntawm 45 ° rau cov khoom siv(Daim duab 8.3). Cov dav hlau 45 ° no sib haum rau cov dav hlau ntawm qhov siab tshaj plaws shear stress nyob rau hauv ib tug tswv cuab nyob rau hauv load. Tej zaum lawv kuj hu ua 'shear di ncauj' (Daim duab 8.1).
Yuav ua li cas cov ntaub ntawv tsis zoo?
Tag nrho cov lus teb (3) Los ntawm txhais, cov ntaub ntawv ductile yog cov uas tau txais cov yas deformation tseem ceeb ua ntej tawg. … Cov ntaub ntawv nkig tsis raug cov yas deformation tseem ceeb. Lawv yog li ua tsis tiav los ntawm kev rhuav tshem cov ntawv cog lus ntawm atoms, uas feem ntau yuav tsum muaj kev ntxhov siab ntawm daim ntawv cog lus.
Cov ntaub ntawv nkig puas ua tsis tau?
Qhov tsis ua tiav ntawm cov khoom siv nkig nyob rau hauv compressive shear loading tau piav qhiafeem ntau yog los ntawm kev sim kev tshawb nrhiav. Qhov tsis ua haujlwm yog nrog los ntawm kev tsim cov pob txha ua ke ntawm curvilinear lossis cov kab tawg, txhim kho raws txoj hauv kev ntawm cov dav hlau tseem ceeb.
