Cov txheej txheem ultrasonic yog ib qho ntawm cov kev txiav txim siab tsis pom. Kev tshaj tawm ntawm ultrasonic tsis nyob hauv homogeneous thiab isotropic elastic nruab nrab muaj feem xyuam nrog qhov ntom thiab elastic qauv ntawm qhov nruab nrab. Thaum cov khoom siv yog qhov ua elastomer, nws cov txheej txheem elastic tuaj yeem txiav txim siab los ntawm ultrasonic vuam. [1] Qhov kev cia siab ntawm kev ntsuas qhov txawv ntawm cov txheej txheem ntawm cov nplai cug los ntawm ultrasonic raug txheeb xyuas. Xyoo tsis ntev los no, txawm hais tias cov ntaub ntawv geotechnical nyob rau hauv kev tsim hluav taws xob kev tsim kho, xws li cov khoom siv ib nrab nruj, cov ntaub ntawv hloov kho polymer, thiab lwm yam tseem tuaj yeem siv los txiav txim siab lawv cov txheej txheem elastic los ntawm ultrasonic txoj kev los cuam tshuam lawv cov yam ntxwv lub cev. Hauv kev tshawb fawb cov ntaub ntawv pov thawj cov khoom siv, polymer hloov cov khoom siv cement thiab lwm cov khoom siv geotechnical, ultrasonic txoj kev raug siv los kawm qhov ua tau ntawm kev txheeb xyuas cov yam ntxwv ntawm cov khoom thiab lwm tus.
Nws tuaj yeem pom los ntawm daim duab ultrasonic waveform tias cov qauv nthwv dej ntawm cov pob zeb zoo tib yam hloov lub voos xwm yeem hloov tom qab qhov kev ntsuas compression, tab sis qhov nthwv dej ntawm cov pob zeb hloov tom qab ntxiv cov polymer hloov me ntsis, qhia tias qhov sib ntxiv ntawm cov polymer cuam tshuam sab hauv. pob zeb tawg ntawm pob zeb ua kom loj thiab micro-tawg thiab nthuav dav. Nrog qhov nce ntawm kev ntxhov siab piv F / Fmax ntawm lub luag haujlwm thiab lub nra loj, lub pob zeb hloov kho tau hloov pauv nrog qhov nce ntawm kev ntxhov siab F / Fmax ntawm cov pob zeb ua ke, uas qhia tau qhov tawm ntawm kev sib kis ntawm micro-tawg Cov.
24 Cov txheej txheem ultrasonic los kawm cov txheej txheem kev puas tsuaj ntawm emulsion-hloov pob zeb Ua kom haum rau cov qhob thiab ntom ntom ntom ntom ntom nti, suab nrov ntawm ultrasonic nthwv dej dhau los ntawm qhov kev xeem yog tus xwm yeem, tab sis tom qab thau khoom, cov kab nrib pleb thiab cov kab nrib pleb tshwm sim sab hauv pob zeb ua ke, thiab nrog lub load Ua kom cov kab nrib pleb thiab cov kab nrib pleb sib kis maj mam nthuav dav zuj zus, qhov hloov pauv ntawm lub suab siv thiab lub sij hawm los ntawm cov xwm txheej tsis xwm yeem. Tib lub sijhawm, ultrasonic tsis dhau los ntawm kev xeem xeem' s suab mus rau qib txawv.
Tom qab kho cov pob zeb ua haujlwm mus txog 28 hnub ntawm hnub nyoog, ua txoj haujlwm axial compression kev sim rau ntawm cov hnoos qeev, pov tseg cov kev tshawb pom ntawm qhov nruab nrab ntawm nws sab, thov siv 3-quab yuam P ntsaws rau cov qhov ntsuas trabecular, thiab pov tseg cov kev ntsuas ntawm qhov chaw. ntawm nws ob sab thiab hauv qab Thaum ntsuas lub waveform thiab suab thaum lub sijhawm thauj khoom, ntsuas qhov ntsuas tau yog: qhov zaus yog 2MHz, qhov taw tes yog qhov tiaj, thiab qhov tshwm sim yog 3. Tus txheej txheem ultrasonic tuaj yeem siv los kawm cov khoom kho tshuab ntawm semi. -yuav khoom thiab polymer hloov cov ntaub ntawv xis mas. Daim ntawv thov ntawm lub ultrasonic txoj kev yog txoj kev loj Engineering Cov ntaub ntawv tshawb fawb muab lwm txoj kev yooj yim.
Lub zog loj elastic modulus ntsuas los ntawm ultrasonic ntawm cov khoom siv ib nrab muaj qhov sib txuam zoo nrog cov ntsiab lus sab nraud flexural thiab flexural tensile zog. Qib kev sib txheeb thiab qhov qhia tawm qhov sib txawv raws li hom kev ruaj ntseg
