Los ntawm kev siv cov nyhuv straining ntawm cov hlau conductors, cov strain gage txuas nrog PCBA tuaj yeem txheeb xyuas los ntawm kev hloov ntawm nws tus kheej cov nqi tiv thaiv thaum PCBA deforms thiab dhau los ua mechanically deformed.Cov quantified strain tuaj yeem muab piv nrog qhov kawg strain los txiav txim siab txog kev pheej hmoo ntawm PCBA deformation rau cov khoom lossis tin point rupture ntawm cov khoom.Muab kev taw qhia rau kev txhim kho cov txheej txheem PCBA.
Lub tshuab kuaj kab mob kuaj pom qhov hloov pauv hluav taws xob tshwm sim los ntawm kev hloov pauv ntawm qhov ntsuas qhov ntsuas tsis kam los ntawm tus choj Wheatstone, thiab tom qab ntawd hloov pauv qhov hloov hluav taws xob hloov mus rau hauv cov kab mob los ntawm qhov kev zov me nyuam hauv kev sim software.
Lub paj strain yog ib hom kab ntsuas uas muaj peb qhov kev ywj pheej rhiab kab sib chaws, uas tau muab tso rau ntawm ib leeg ntawm ib qho taw tes los ntsuas cov kab mob raws li lawv cov axes ntawm ib qho chaw.
Cov kab mob yog txhais raws li (ntev hloov) / (qhov ntev ntawm qhov qub), yog qhov loj ntawm lub cev tsis muaj nuj nqis, hauv PCBA strain test, vim tias tus nqi lim tsawg heev, feem ntau tau piav qhia los ntawm microstrain (με), raws li 106 * (ntev hloov) / (thawj ntev) los txhais microstrain.
Hauv PCBA strain test, lub xeev ntawm PCBA yog lub dav hlau strain xeev.Lub tshuab kuaj kab mob tuaj yeem suav cov hom kab mob tseem ceeb thiab cov kab mob hnyav hauv cov txheej txheem PCBA los ntawm kev ntsuas tus nqi ntawm lub sij hawm tiag tiag hauv peb cov lus qhia ntawm cov paj lim, thiaj li txiav txim siab seb cov khoom lag luam ntawm cov txheej txheem siab tshaj tus qauv.
Cov kauj ruam dhau qhov kev txwv nruj yog suav tias yog ntau dhau thiab raug txheeb xyuas rau kev kho kom raug.Kev txwv tsis pub muaj peev xwm muab tau los ntawm cov neeg siv khoom, cov khoom lag luam, lossis cov kev paub zoo hauv kev lag luam / kev lag luam (los ntawm IPC_JEDEC-9704A).
Qhov twg lub hom phiaj tseem ceeb yog qhov loj tshaj plaws thiab qhov tsawg tshaj plaws orthogonal strain nyob rau hauv ib lub dav hlau, perpendicular rau ib leeg thiab tangent strain nyob rau hauv cov kev taw qhia yog xoom.Hauv PCBA strain test, lub hom phiaj tseem ceeb feem ntau yog xam los ntawm kev ntsuas raws li qhov kev ntsuas tseem ceeb.Tus nqi strain qhia tus nqi hloov pauv ntawm ib lub sijhawm, uas yog siv los ntsuas qhov kev pheej hmoo ntawm kev puas tsuaj ntawm cov khoom.
Strain gage
IPC_JEDEC-9704A
Kev ntsuam xyuas kev ntsuam xyuas qhov system
Post lub sij hawm: Apr-22-2024