NGHIEN CLfU-TRAOD6| V PHlfONG PHAP TfNH T O A N AP SUAT T A M TRONG CHE TAO K^T CAU Tl> VAT LIEU COMPOZIT CALCULATION METHOD OF IMPREGNATED PRESSURE IN FABRICATION OF COMPOSITE STRUCTURE TS Trsbi Ngoc Thanh Vien Khoa hoc va Cdng nghe Quan sU Ap sudt tdm nhUa nen vdo vdt lieu cot la thong sd quan de dieu khien thiet bi tdm dp qud trinh che tao cdc kit cdu tii compozit Bdi bdo da xdy mo hinh sU phu thugc cua dp sudt vdo kich thtCdc vd thdi gian gia cong cua ket cdu Tren cd sd do, xdy dUngdUCc phiidngphdp vd tti tinh todn xdc dinh dp sudt tdm cdn thiet gia cong kit cdu td compozit Cdc kit qud tinh todn the ditdc dp dung cho op che xuyen thdu dien tit cua mot loqi ten Ida doi hdi Tii khoa: Cong nghe compozit; Cong nghe ten Ida; Ten Ida ABSTRACT Resin impregnated pressure intobase material is an important parameter to control pressure impregnation equipment in the fabrication process of composite structures The paper describes the built model of impregnated pressure dependencyto size and duration of structure fabrication On that basis, methods and order of calculations to determinethe requiredimpregnatedpressure for fabrication of composite structures have been built The specific calculation results are applied to electromagneticpenetrable covertilesof antiship missile Keywords: Composite technology; Missile technology; Missile ISSN 0866 - 7056 TAP CHi CO KHi V I £ T NAM, Sd nam www.cokhivietnam.vn 2016 NGHIEN CLfU - TRAO OOl MO DAU Cdng nghe t i m i p lUc l i cdng nghe thudng dupc sd dung d l che tao cic kit ciu cd ylu ciu chit lupng rat cap ky thuit ten Ida v i hing khdng d i n dung [2,3] D l lam chu cdng nghe n i y can l i m chu cic thdng sd cdng nghe cd b i n la: Van tdc tara tdi Uu, i p suit tam [2] Xic dinh tdc dp tam nhUa nen tdi Uu lin vat lilu cdt khudn nham loai trd sU xuat hiln cic ro sin pham d i dUpc nghiin cttu trpng [1] Vin de dit li, ttng vdi radi van tdc tara tdi Uu, cin xac dinh dUpe qui luit ap suit tam can tap tren thilt bi tara theo thdi gian tam v i sin phim cu t h i can c h i tao IVIO HINH T O A N A P SUAT TAM Sttc cin thuy dpng nhUa n l n chay ddng qua vit lieu cdt khudn vdi mat cat ngang thay doi cd the tinh toin dupe nhd phUPng trinh vi phin Darci nhu sau [5]: dP- _4(l-r^ m: Trong dd: v^ -PhSn tram the tich cda cat phan td ran; f- Y>k mat riSng (m^/m^) cua cac phan td ran Ddi vdi ciz phan td ran dang tri^ dai c6 dudng kinh d^ gia t r i / dddc xac dinh nhd sau: 4i^ (3) Trong trUdng hdp sd dung vai thuy tinh lam vat lieu cdt, cac khe dan nhUa nen dUdc t^o gida tap hdp cac sdi chi, cd dddng kinh d Cac sdi chi lai dUdc t^o td rat nhieu sdi ddn nhd hdn Bl mat ngoai hieu dung cda cac sdi chi ldn hdn hinh tru trdn cd dddi^ kinh d^ Dddng kinh tUdng dUdng cua khe d ^ trudng hdp cd the dUdc xac dinh theo phUdng trinh sau: (1) "^ d„ Trong dd: P^ -Ap suat cua nhiia nen; X -He so llic can thuy ddng; W -Van toe chuyen ddng cua nhiia nen qua khe dan diicfc tao gida cac cdt; p - Khoi liidng rieng cua vat lieu nln; d^^ -Diidng kinh tUdng diidng cua cac khe dan gida cac cdt ma nhUa nen chay qua; 1^^ -Do dai nhUa nen chay mgt Idp cdt cd tinh tdi cong cua khe dan Diidng kinh khe dan tUdng diidng cua he xdp phu thupc vao hinh dang cua cac phan td ran, each phoi tri va mdc dp sit chat cua chung Trong trUdng hdp cac phan td ran dUdc phan bd deu toan bd the tich thi dudng kinh tUdng diidng cda khe dan dUdc xac dinh nhd sau [5]: Trong dd: k -He sd tinh din sU tang b^ mat ben cua sdi chi so vdi phan td cd dang tr\i trdn cd cung dUdng kinh tUdng dUdng; v^ -PhSn tram the tich cua vat lieu cdt Trong thuc te tinh toan de thuan tien sif dung khoang each vung tam: l=-ii- (5) Vdi t, la he so tinh den dp cong cua khe dan ISSN 0866 - 7056 TAP CHl CO KHi VIET NAM, S6 nam 2016 www.cokhivietnam.vn NGHIEN CLfU - TRAO B | Llic can thdy ddng chay qua cac dng He sd can nhdt phu thupc vao che dp chay cua chat long (chay tang hay chay rdi) cd the dUdc tinh toan theo cdng thdc sau: Trong dieu kien thUc t l cong nghe tam ap lUc, nhUa nl'n thudng la chay tang Khi dd, he sd can nhdt dUdc xac dinh theo cdng thdc [5]: (9) ^ ^„rl Trong do: d^^ -Dudng kinh ong dan; W^ -Van toe ehuyin dpng cua nhUa nen dng dSn; p -Khdi lUdng rieng eua nhUa nen; l^^ -Dp Trong dd: R^ la he sd Ray - ndn R^=Wd^j dai dng ndi; n^ -He sd tdn that cue bp dUdc xac p^, vdi r\ la dp nhdt ddng hpc cua vat lieu nen; dinh cae sd tay; X=64/Re - He sd can nhdt C - He sd thUc nghiem, ddi vdi trUdng hdp chat [5] long chuyen dpng qua cac Idp vat ran ddpc lay khoang 130 den 220 [4] Neu dp dai tUdng dUdng L,^ ^ 'w + Zi ^•'^od thi phUdng trinh (3.19) dUdc viet lai nhd sau: Sd dung cac he thdc trln va biln ddi phUdng trinh (1) nhan dUdc: (10) AP, dL • Ckfi^ul -r]Wdl (7) dPNhu vay, tdng can nhUa nen chay 2dl{\-u^) qua dng dan va vat lieu cdt dUdc tinh nhU sau: (6) R, Khi dd, dp can nhdt cua phan cdt da tam dupc xac dinh nhu sau: AP^AP +AP„ (11) Khi tam dUdi ap su^t thuy tinh, cac phan ap suat khdng ldn hdn nhieu so vdi cac phan can thuy dpng, \a vay, gia tri AP thiic te bang vdi ap suat dU budng chda Trong dd: L -Kich thUdc vung tam nhUa nen (khoang each gida mat vao va mat tU cua Dl ddn gian hda cae tinh toan tilp theo, nhiia nen) phUdng trinh hen tuc cho ddng nhUa nln dUdc ThUc te vat lieu cdt se dUde nen ep vao eho dudi dang: AP = \ ^^ ' ,TiWdJ (8) nen se khdng phan bd thiie sii ddng diu = F(r),(12) long khudn Vl vay, phUdng trinh tren ehi dUdc WJX''-u,)-WJ,(\-o,) = W„, sd dung de danh gia mpt each gan dung lUc can thuy ddng cua mdi tnidng xdp, cdn de tinh toan Trong do: W, f -Van tdc chay cua nhiia chinh xac cin sd dung eac so lieu thiic nghiem nen va dien tich mat cat ngang cda khudn tUdng theo dd tham cua vat lieu dng vdi mat cat thd i; W^, f^- Van tdc chay cda nhUa nen va dien tieh mat cat ngang eua khudn ^ ISSN 0866 - 7056 TAP CHi CO KHi V I £ T NAM, 86 nam www.cokhivietnam.vn 2016 J NGHIEN CO'U - TRAO D | tuong ttng vdi rait biln gifla vung tam vi vung Cd the sd dtmg phUPng trinh trln chua dupc tim; W j, d^j - Van tdc chuyen ddng tinh toin cho sin pham cd mat cit ngang khdng; cua nhUa nen dng dan vi dttdng kinh cua doi khac nhd li cic vd tru (toy nhiln, cdng thift; ; nd;V-The tich nhUa nl'n tai thdi diem T dien tich se khac) h't Sau thay gia tri van tdc tttc thdi W, Cic cdng thdc xic dinh f vi T(L) cho van tdc nhtta nln chuyen dpng trpng dng din rapt sd cic dang sin phim ddi xdng true cd dg W bdi van tdc tara tdi Uu, kit hpp vdi phuong diy khdng ddi nhda nln dUpc htm trinh liln tuc ta nhin dUpc: vio theo chu vi ngoii nhu sau: - Dia cd dudng kmh R va dp diy h: Ck,l;u] ^P'llWM\~D„) (13) \ldl(\-o,)'f(l) /„(i) = 2.M^-i);ni) = ^ h i [ ^ ] ; ( ) Phuong trinh (13)radta sU phu thupc - Vd cdn cd ban kinh cd sd R, nda gdc cf cua dp chinh ap vdi van tdc chuyen ddng mat ttt nhUa nln, vi tri tuong ddi cua mat ttt dinh iii, dp day h: cd tinh din cic die tinh cua dng dan, vit lieu cdt vi hinh dang cua sin phim Trong trUdng hpp UL) = lnh{R-Umm)\F{l) = —^ ln( , 1(18) nlu die tinh cua vat li|u cdt khdng ddi toan bd sin pham thi phuang trinh trln cd the - Vd dang nda cau cd ban kinh R, dp dayh: dupc bilu thi dudi dang sau: AP = //r„/,(l-t^JK,+^„F(I)], (14) Trong do: , ^m , ; f m J ' ,,;(15) 2