Modulus ntawm elasticity ntawm pob zeb: nws yog dab tsi thiab yuav txiav txim li cas?

Modulus ntawm elasticity ntawm pob zeb: nws yog dab tsi thiab yuav txiav txim li cas?
Modulus ntawm elasticity ntawm pob zeb: nws yog dab tsi thiab yuav txiav txim li cas?

Video: Modulus ntawm elasticity ntawm pob zeb: nws yog dab tsi thiab yuav txiav txim li cas?

Video: Modulus ntawm elasticity ntawm pob zeb: nws yog dab tsi thiab yuav txiav txim li cas?
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Ntau tus neeg xav paub ntau npaum li cas lub zog thiab kev thauj khoom cuam tshuam rau cov vaj tse pob zeb. Qhob yog lub cev muaj zog uas zoo li succumb rau deformation thaum raug rau sab nraud quab yuam. Nws yog lub peev xwm los elastic deformation (ntawm ib ntus xwm) uas qhia txog lub modulus ntawm elasticity ntawm pob zeb.

Modulus ntawm elasticity ntawm pob zeb
Modulus ntawm elasticity ntawm pob zeb

Tus nqi ntawm elasticity yog txiav txim siab thaum kuaj ntau yam qauv rau kev tiv thaiv kom nruj lossis compression. Txawm li cas los xij, koj yuav tsum paub tias cov pob zeb uas tsis muaj qhov txhawb nqa tsis ruaj khov hauv qhov nro. Raws li cov txiaj ntsig kev xeem, ib daim duab ntawm kev vam khom ntawm qhov tshwm sim deformations ntawm lub zog siv rau cov khoom tsim. Visualization txhawb kev nkag siab zoo dua. Nws kuj tseem yuav tsum paub txog qhov pib modulus ntawm elasticity ntawm pob zeb thiab tus nqi ntawm deformation.

Initial modulus ntawm elasticity ntawm pob zeb
Initial modulus ntawm elasticity ntawm pob zeb

Nyob rau hauv kev thauj khoom, qhov nce ntawm deformation yog vim qhov tseeb tias pob zeb muaj xws li cov khoom nkag. Ua ntej, ntawm ib lub siab,elastic deformation. Nws yog ib qho tshwm sim nyob rau hauv uas lub cev uas tau deformed los ntawm ib tug load rov qab mus rau nws qub zoo tom qab nws tau ploj lawm. Tom qab ntawd, nrog kev thauj khoom ntxiv, irreversible (yas) deformations pib tshwm sim hauv cov khoom. Txawm li cas los xij, nws yog qhov nyuaj heev los cais cov yas thiab elastic hloov. Vim tias qhov hloov pauv tam sim ntawd nyob ntawm tus nqi ntawm kev thauj khoom nce. Vim li no, lub deformation thaum lub sij hawm nce nyob rau hauv load yog hu ua elastic, thiab ib tug ntxiv nce nyob rau hauv cov duab hloov yog hu ua yas. Nws yog vim qhov creep ntawm pob zeb. Ntxiv deformation yog qhov kev puas tsuaj ntawm cov khoom. Qhov modulus ntawm elasticity ntawm pob zeb feem ntau kuj hu ua modulus ntawm deformation. Nws raug txiav txim siv ntau txoj hauv kev.

Qhov pib modulus ntawm elasticity ntawm pob zeb yog qhov nyuaj heev los txiav txim siab. Txawm li cas los xij, nws qhov kwv yees tus nqi tuaj yeem tsim tsis ncaj qha. Hauv ntau daim duab, txoj kab secant mus rau qhov kev ntxhov siab-txoj kev nkhaus yog feem ntau, txawm tias tsis yog ib txwm, ib qho sib npaug sib npaug uas mus dhau qhov keeb kwm.

Modulus ntawm elasticity ntawm pob zeb v25
Modulus ntawm elasticity ntawm pob zeb v25

Relatively tseeb yog cov lus hais tias lub modulus ntawm elasticity ntawm pob zeb nce nyob rau hauv ncaj qha proportional rau lub hauv paus ntawm nws lub zog. Txawm li cas los xij, qhov no tsuas yog muaj tseeb rau qhov tseem ceeb ntawm daim duab (kev ntxhov siab-kev nyuaj siab) thiab nyob ntawm ib puag ncig thiab kev sim ntsuas. Raws li ib qho piv txwv, cov dej-saturated hom ntawm cov khoom nyob rau hauv kev ntsuam xyuas muaj ib tug siab elastic modulus dua cov qauv qhuav. Txawm hais tias lawv cov khoom ruaj khov zoo sib xws.

Cov qauv ntawm elasticity tau cuam tshuam zoo heevcoarse muab tub lim zoo. Txoj kev sib raug zoo no yog ncaj nraim rau pem hauv ntej. Lawm, qhov taw qhia ntawm lub teeb pob zeb yuav qis dua li cov qauv hnyav. Lub elasticity kuj nce nrog lub hnub nyoog ntawm cov ntaub ntawv. Piv txwv li, lub modulus ntawm elasticity ntawm qhob v25, tom qab ib xyoos yuav siab tshaj qhov pib, thiab tom qab 10 xyoo nws yuav nce ntau dua. Txhawm rau txiav txim siab qhov ntsuas elasticity, muaj ib lub rooj tshwj xeeb, uas qhia txog qhov kwv yees thawj zaug ntawm cov khoom ntawm txhua hom.

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